6ybv

Structure of a human 48S translational initiation complex - eIF2-TC

Method: ELECTRON MICROSCOPY D_max: 120.0 Å Quality: EXCELLENT

▼

1. Protein Identity and Related Structures Protein Identity & Related Structures

Eukaryotic translation initiation factor 2 subunit 2

OrganismNot specified

UniProt P20042

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein–RNA Heteromer Protein × 3 RNA 2 PDB declaration: pentameric（5） Consistent with all polymer counts	Chain s； UniProt 1–333	Not recorded	Eukaryotic translation initiation factor 2 subunit 1 × 1 （P05198） Initiator methionine tRNA × 1 mRNA × 1 Eukaryotic translation initiation factor 2 subunit 3 × 1 （P41091）	ELECTRON MICROSCOPY cryo-EM buffer：pH 7.4 cryo-EM vitrification conditions：Cryogen ETHANE	Resolution 3.80 Å

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB	Difference from Current Entry 6YBV	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
28ZU human 48S PIC with Kozak mRNA and eIF1A W70A mutant Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 38 PDB declaration: 41-meric	Chain F 1–333（333 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 3.20 Å
28ZV human 48S PIC with mRNA (non-Kozak) Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 38 PDB declaration: 41-meric	Chain F 1–333（333 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 2.90 Å
28ZX human 48S PIC with mRNA (Kozak_1) Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 47 PDB declaration: 50-meric	Chain F 1–333（333 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 2.80 Å
28ZY human 48S PIC with mRNA (Kozak_2) Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 47 PDB declaration: 50-meric	Chain F 1–333（333 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 3.00 Å
6K71 eIF2 - eIF2B complex Deposited 2019-06-05	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric	Chain M 1–333（333 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.30 Å
6K72 eIF2(aP) - eIF2B complex Deposited 2019-06-05	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: tetradecameric	Chain M 1–333（333 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.60 Å
6ZMW Structure of a human 48S translational initiation complex Deposited 2020-07-04	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 54 PDB declaration: 57-meric	Chain s 1–333（333 aa）	Not recorded	ZN ZINC ION × 2 MG MAGNESIUM ION × 89	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.70 Å
6ZP4 SARS-CoV-2 Nsp1 bound to a human 43S preinitiation ribosome complex - state 2 Deposited 2020-07-08	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 52 PDB declaration: 54-meric	Chain 4 1–333（333 aa）	Not recorded	ZN ZINC ION × 4 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.90 Å
7A09 Structure of a human ABCE1-bound 43S pre-initiation complex - State III Deposited 2020-08-07	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 52 PDB declaration: 54-meric	Chain 4 1–333（333 aa）	Not recorded	ZN ZINC ION × 4 SF4 IRON/SULFUR CLUSTER × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 1 MG MAGNESIUM ION × 3 ATP ADENOSINE-5'-TRIPHOSPHATE × 1 MET METHIONINE × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.6 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.50 Å
7D43 eIF2B-eIF2(aP), aPg complex Deposited 2020-09-22	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: tetradecameric	Chain M 1–333（333 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.30 Å
7QP6 Structure of the human 48S initiation complex in open state (h48S AUG open) Deposited 2022-01-03	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 50 PDB declaration: 53-meric	Chain s 1–333（333 aa）	Not recorded	ZN ZINC ION × 2 MG MAGNESIUM ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5；20 mM Hepes, pH 7.5, 95 mM KOAc, 3.75 mM Mg(OAc)2, 1 mM ATP, 0.5 mM GTP, 0.25 mM spermidine, 2 mM DTT, 0.4 U/uL RiboLock RNase inhibitor cryo-EM vitrification conditions Cryogen ETHANE；Cryo-EM grids were prepared by floating home-made continuous carbon on 40 ul sample in the wells of teflon block (custom-made). The sample-covered carbon was then adsorbed to an EM grid.	Resolution 4.70 Å
8OZ0 Structure of a human 48S translation initiation complex with eIF4F and eIF4A Deposited 2023-05-06	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 54 PDB declaration: 57-meric	Chain U 1–333（333 aa）	Not recorded	ZN ZINC ION × 2 MG MAGNESIUM ION × 89	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.50 Å
8PJ1 Structure of human 48S translation initiation complex in open codon scanning state (48S-1) Deposited 2023-06-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 51 PDB declaration: 54-meric	Chain s 1–333（333 aa）	Not recorded	MG MAGNESIUM ION × 90 ZN ZINC ION × 3 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MET METHIONINE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；Manual blotting & plunge-freezing	Resolution 3.40 Å
8PPL MERS-CoV Nsp1 bound to the human 43S pre-initiation complex Deposited 2023-07-07	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 50 PDB declaration: 52-meric	Chain Is 1–333（333 aa）	Not recorded	ZN ZINC ION × 4 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 116 MET METHIONINE × 1 UNX UNKNOWN LIGAND × 129	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE-PROPANE	Resolution 2.65 Å
9HVE Native human eIF2-eIF2B complex Deposited 2024-12-27	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 16 PDB declaration: hexadecameric	Chain M 1–333（333 aa） Chain N 1–333（333 aa）	Not recorded	GTP GUANOSINE-5'-TRIPHOSPHATE × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.70 Å
9HVF Native human PPP1R15B-P-eIF2-eIF2B complex Deposited 2024-12-27	Different oligomeric state Different experimental conditions	Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric	Chain C 1–333（333 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.80 Å

16 other PDB entries and 16 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	IF2B_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain s； PDBConstruct 1–333； UniProt 1–333

Eukaryotic translation initiation factor 2 subunit 1

OrganismNot specified

UniProt P05198

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein–RNA Heteromer Protein × 3 RNA 2 PDB declaration: pentameric（5） Consistent with all polymer counts	Chain r； UniProt 1–315	Not recorded	Eukaryotic translation initiation factor 2 subunit 2 × 1 （P20042） Initiator methionine tRNA × 1 mRNA × 1 Eukaryotic translation initiation factor 2 subunit 3 × 1 （P41091）	ELECTRON MICROSCOPY cryo-EM buffer：pH 7.4 cryo-EM vitrification conditions：Cryogen ETHANE	Resolution 3.80 Å

Other States of the Same Protein in the Database

Other PDB	Difference from Current Entry 6YBV	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1KL9 Crystal structure of the N-terminal segment of Human eukaryotic initiation factor 2alpha Deposited 2001-12-11	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–182（182 aa） Fragment：residues 1-182	Non-standard monomer：Yes (specific site not provided by mmCIF)	ZN ZINC ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；295 K；PEG 4000, sodium acetate, zinc chloride, pH 5.5, VAPOR DIFFUSION, SITTING DROP at 295K	Resolution 1.90 Å R-free 0.233
1KL9 Crystal structure of the N-terminal segment of Human eukaryotic initiation factor 2alpha Deposited 2001-12-11	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–182（182 aa） Fragment：residues 1-182	Non-standard monomer：Yes (specific site not provided by mmCIF)	ZN ZINC ION × 8	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；295 K；PEG 4000, sodium acetate, zinc chloride, pH 5.5, VAPOR DIFFUSION, SITTING DROP at 295K	Resolution 1.90 Å R-free 0.233
1KL9 Crystal structure of the N-terminal segment of Human eukaryotic initiation factor 2alpha Deposited 2001-12-11	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–182（182 aa） Fragment：residues 1-182	Non-standard monomer：Yes (specific site not provided by mmCIF)	ZN ZINC ION × 8	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.5；295 K；PEG 4000, sodium acetate, zinc chloride, pH 5.5, VAPOR DIFFUSION, SITTING DROP at 295K	Resolution 1.90 Å R-free 0.233
1Q8K Solution structure of alpha subunit of human eIF2 Deposited 2003-08-21	Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 4–302（299 aa）	Not recorded	No recorded non-water small molecule	SOLUTION NMR NMR measurement conditions pH 7；298 K；Ionic strength (raw mmCIF value) 1.1；Pressure 1	Resolution not provided
28ZU human 48S PIC with Kozak mRNA and eIF1A W70A mutant Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 38 PDB declaration: 41-meric	Chain D 1–315（315 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 3.20 Å
28ZV human 48S PIC with mRNA (non-Kozak) Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 38 PDB declaration: 41-meric	Chain D 1–315（315 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 2.90 Å
28ZX human 48S PIC with mRNA (Kozak_1) Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 47 PDB declaration: 50-meric	Chain D 1–315（315 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 2.80 Å
28ZY human 48S PIC with mRNA (Kozak_2) Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 47 PDB declaration: 50-meric	Chain D 1–315（315 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 3.00 Å
6K71 eIF2 - eIF2B complex Deposited 2019-06-05	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric	Chain K 1–315（315 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.30 Å
6K72 eIF2(aP) - eIF2B complex Deposited 2019-06-05	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: tetradecameric	Chain K 1–315（315 aa） Chain L 1–315（315 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.60 Å
6O81 Electron cryo-microscopy of the eukaryotic translation initiation factor 2B bound to translation initiation factor 2 from Homo sapiens Deposited 2019-03-08	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 16 PDB declaration: hexadecameric	Chain L 1–315（315 aa） Chain M 1–315（315 aa）	Not recorded	C7B 2-(4-chloranylphenoxy)-~{N}-[4-[2-(4-chloranylphenoxy)ethanoylamino]cyclohexyl]ethanamide × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.21 Å
6O85 Electron cryo-microscopy of the eukaryotic translation initiation factor 2B bound to eukaryotic translation initiation factor 2 from Homo sapiens Deposited 2019-03-08	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric	Chain L 2–315（314 aa）	Not recorded	C7B 2-(4-chloranylphenoxy)-~{N}-[4-[2-(4-chloranylphenoxy)ethanoylamino]cyclohexyl]ethanamide × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.03 Å
6O9Z Electron cryo-microscopy of the eukaryotic translation initiation factor 2B bound to eukaryotic translation initiation factor 2 from Homo sapiens Deposited 2019-03-15	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: dodecameric	Chain L 2–315（314 aa） Chain M 2–315（314 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.03 Å
6ZMW Structure of a human 48S translational initiation complex Deposited 2020-07-04	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 54 PDB declaration: 57-meric	Chain r 1–315（315 aa）	Not recorded	ZN ZINC ION × 2 MG MAGNESIUM ION × 89	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.70 Å
6ZP4 SARS-CoV-2 Nsp1 bound to a human 43S preinitiation ribosome complex - state 2 Deposited 2020-07-08	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 52 PDB declaration: 54-meric	Chain O 1–315（315 aa）	Not recorded	ZN ZINC ION × 4 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.90 Å
7A09 Structure of a human ABCE1-bound 43S pre-initiation complex - State III Deposited 2020-08-07	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 52 PDB declaration: 54-meric	Chain O 1–315（315 aa）	Not recorded	ZN ZINC ION × 4 SF4 IRON/SULFUR CLUSTER × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 1 MG MAGNESIUM ION × 3 ATP ADENOSINE-5'-TRIPHOSPHATE × 1 MET METHIONINE × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.6 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.50 Å
7D43 eIF2B-eIF2(aP), aPg complex Deposited 2020-09-22	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: tetradecameric	Chain K 1–315（315 aa） Chain L 1–315（315 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.30 Å
7D44 eIF2B-eIF2(aP), aP2 complex Deposited 2020-09-22	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: dodecameric	Chain K 1–315（315 aa） Chain L 1–315（315 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.00 Å
7D45 eIF2B-eIF2(aP), aP1 complex Deposited 2020-09-22	Different mutation/modification Different oligomeric state Different experimental conditions	Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: undecameric	Chain K 1–315（315 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.80 Å
7F66 eIF2B-SFSV NSs-1-eIF2 Deposited 2021-06-24	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 15 PDB declaration: pentadecameric	Chain N 1–315（315 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.76 Å
7F67 eIF2B-SFSV NSs-2-eIF2 Deposited 2021-06-24	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 18 PDB declaration: octadecameric	Chain N 1–315（315 aa） Chain Q 1–315（315 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.59 Å
7NZM Cryo-EM structure of pre-dephosphorylation complex of phosphorylated eIF2alpha with trapped holophosphatase (PP1A_D64A/PPP1R15A/G-actin/DNase I) Deposited 2021-03-24	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Heteromer；Protein × 5 PDB declaration: pentameric	Chain E 2–187（186 aa）	Mutation：phosphorylated Ser51 Non-standard monomer：Yes (specific site not provided by mmCIF)	MN MANGANESE (II) ION × 1 ATP ADENOSINE-5'-TRIPHOSPHATE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4；0.22mM Triton X-100 was added into the solution before plunging. cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.96 Å
7QP6 Structure of the human 48S initiation complex in open state (h48S AUG open) Deposited 2022-01-03	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 50 PDB declaration: 53-meric	Chain r 1–315（315 aa）	Not recorded	ZN ZINC ION × 2 MG MAGNESIUM ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5；20 mM Hepes, pH 7.5, 95 mM KOAc, 3.75 mM Mg(OAc)2, 1 mM ATP, 0.5 mM GTP, 0.25 mM spermidine, 2 mM DTT, 0.4 U/uL RiboLock RNase inhibitor cryo-EM vitrification conditions Cryogen ETHANE；Cryo-EM grids were prepared by floating home-made continuous carbon on 40 ul sample in the wells of teflon block (custom-made). The sample-covered carbon was then adsorbed to an EM grid.	Resolution 4.70 Å
7QP7 Structure of the human 48S initiation complex in closed state (h48S AUG closed) Deposited 2022-01-03	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 48 PDB declaration: 51-meric	Chain r 1–315（315 aa）	Not recorded	ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5；20 mM Hepes, pH 7.5, 95 mM KOAc, 3.75 mM Mg(OAc)2, 1 mM ATP, 0.5 mM GTP, 0.25 mM spermidine, 2 mM DTT, 0.4 U/uL RiboLock RNase inhibitor cryo-EM vitrification conditions Cryogen ETHANE；Cryo-EM grids were prepared by floating home-made continuous carbon on 40 ul sample in the wells of teflon block (custom-made). The sample-covered carbon was then adsorbed to an EM grid.	Resolution 3.70 Å
7SYR Structure of the wt IRES eIF2-containing 48S initiation complex, closed conformation. Structure 12(wt). Deposited 2021-11-25	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 36 PDB declaration: 39-meric	Chain j 1–315（315 aa）	Not recorded	ZN ZINC ION × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE-PROPANE；4 second blot time, force 3	Resolution 3.60 Å
7SYS Structure of the delta dII IRES eIF2-containing 48S initiation complex, closed conformation. Structure 12(delta dII). Deposited 2021-11-25	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 36 PDB declaration: 39-meric	Chain j 1–315（315 aa）	Not recorded	ZN ZINC ION × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE-PROPANE；4 second blot time, force 3	Resolution 3.50 Å
8OZ0 Structure of a human 48S translation initiation complex with eIF4F and eIF4A Deposited 2023-05-06	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 54 PDB declaration: 57-meric	Chain D 1–315（315 aa）	Not recorded	ZN ZINC ION × 2 MG MAGNESIUM ION × 89	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.50 Å
8PJ1 Structure of human 48S translation initiation complex in open codon scanning state (48S-1) Deposited 2023-06-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 51 PDB declaration: 54-meric	Chain r 1–315（315 aa）	Not recorded	MG MAGNESIUM ION × 90 ZN ZINC ION × 3 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MET METHIONINE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；Manual blotting & plunge-freezing	Resolution 3.40 Å
8PJ2 Structure of human 48S translation initiation complex in AUG recognition state after eIF5-induced GTP hydrolysis by eIF2 (48S-2) Deposited 2023-06-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 46 PDB declaration: 49-meric	Chain r 1–315（315 aa）	Not recorded	MG MAGNESIUM ION × 87 ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；Manual blotting & plunge-freezing	Resolution 3.40 Å
8PJ3 Structure of human 48S translation initiation complex upon transfer of initiator tRNA to eIF5B (48S-3) Deposited 2023-06-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 51 PDB declaration: 54-meric	Chain r 1–315（315 aa）	Not recorded	GTP GUANOSINE-5'-TRIPHOSPHATE × 1 NA SODIUM ION × 1 MG MAGNESIUM ION × 89 ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；Manual blotting & plunge-freezing	Resolution 3.70 Å
8PJ4 Structure of human 48S translation initiation complex after eIF5 release (48S-4) Deposited 2023-06-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 50 PDB declaration: 53-meric	Chain r 1–315（315 aa）	Not recorded	GTP GUANOSINE-5'-TRIPHOSPHATE × 1 NA SODIUM ION × 1 MG MAGNESIUM ION × 89 ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；Manual blotting & plunge-freezing	Resolution 3.20 Å
8PPL MERS-CoV Nsp1 bound to the human 43S pre-initiation complex Deposited 2023-07-07	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 50 PDB declaration: 52-meric	Chain Ir 1–315（315 aa）	Not recorded	ZN ZINC ION × 4 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 116 MET METHIONINE × 1 UNX UNKNOWN LIGAND × 129	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE-PROPANE	Resolution 2.65 Å
8QZZ Crystal structure of human eIF2 alpha-gamma complexed with PPP1R15A_420-452 Deposited 2023-10-30	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain B 1–315（315 aa）	Not recorded	GNP PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；11-12% PEG 6000, 0.1M Tris-HCl pH8.5 supplemented with amino acids	Resolution 3.35 Å R-free 0.299
9HVD Native human P-eIF2-eIF2B complex Deposited 2024-12-27	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: 12-meric	Chain K 1–315（315 aa） Chain L 1–315（315 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.04 Å
9HVE Native human eIF2-eIF2B complex Deposited 2024-12-27	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 16 PDB declaration: hexadecameric	Chain K 1–315（315 aa） Chain L 1–315（315 aa）	Not recorded	GTP GUANOSINE-5'-TRIPHOSPHATE × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.70 Å
9HVF Native human PPP1R15B-P-eIF2-eIF2B complex Deposited 2024-12-27	Different oligomeric state Different experimental conditions	Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric	Chain B 1–315（315 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.80 Å
9NB9 Viral protein DP71L in complex with phosphorylated eIF2alpha (NTD) and protein phosphatase 1A (D64A), stabilized by G-actin/DNAseI Deposited 2025-02-13	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric	Chain A 2–187（186 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	MN MANGANESE (II) ION × 1 CA CALCIUM ION × 1 ATP ADENOSINE-5'-TRIPHOSPHATE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；3.5 uL volume, -5 blot force, 1.5 blot time	Resolution 3.03 Å
9QC6 Structure of eIF2B decamer bound to (P)eIF2 alpha and Compound A-(S) Deposited 2025-03-04	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: 11-meric	Chain K 1–187（187 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	A1I5O ~{N}-[(1~{S})-7-[3-[[ethanoyl(methyl)amino]methyl]phenyl]-5-(trifluoromethyl)-1,2,3,4-tetrahydronaphthalen-1-yl]-2-[[(3~{R},4~{S})-3-fluoranylpiperidin-4-yl]methoxy]-~{N}-methyl-ethanamide × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.83 Å

36 other PDB entries and 38 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	IF2A_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain r； PDBConstruct 1–315； UniProt 1–315

Eukaryotic translation initiation factor 2 subunit 3

OrganismNot specified

UniProt P41091

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein–RNA Heteromer Protein × 3 RNA 2 PDB declaration: pentameric（5） Consistent with all polymer counts	Chain t； UniProt 1–472	Not recorded	Eukaryotic translation initiation factor 2 subunit 2 × 1 （P20042） Eukaryotic translation initiation factor 2 subunit 1 × 1 （P05198） Initiator methionine tRNA × 1 mRNA × 1	ELECTRON MICROSCOPY cryo-EM buffer：pH 7.4 cryo-EM vitrification conditions：Cryogen ETHANE	Resolution 3.80 Å

Other States of the Same Protein in the Database

Other PDB	Difference from Current Entry 6YBV	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
28ZU human 48S PIC with Kozak mRNA and eIF1A W70A mutant Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 38 PDB declaration: 41-meric	Chain E 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 3.20 Å
28ZV human 48S PIC with mRNA (non-Kozak) Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 38 PDB declaration: 41-meric	Chain E 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 2.90 Å
28ZX human 48S PIC with mRNA (Kozak_1) Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 47 PDB declaration: 50-meric	Chain E 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 2.80 Å
28ZY human 48S PIC with mRNA (Kozak_2) Deposited 2026-03-03	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 47 PDB declaration: 50-meric	Chain E 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY mmCIF provides none of the parsed conditions	Resolution 3.00 Å
6FEC Human cap-dependent 48S pre-initiation complex Deposited 2017-12-31	Different construct Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 47 PDB declaration: 50-meric	Chain S 39–460（422 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5；20 mM Tris HCl, 50 mM KOAc, 2.5 mM MgCl2, 2 mM DTT, 0.25 mM spermidine 0.25 mM GMPPNP cryo-EM vitrification conditions Cryogen ETHANE	Resolution 6.30 Å
6K71 eIF2 - eIF2B complex Deposited 2019-06-05	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric	Chain P 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.30 Å
6K72 eIF2(aP) - eIF2B complex Deposited 2019-06-05	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: tetradecameric	Chain P 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.60 Å
6O81 Electron cryo-microscopy of the eukaryotic translation initiation factor 2B bound to translation initiation factor 2 from Homo sapiens Deposited 2019-03-08	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 16 PDB declaration: hexadecameric	Chain S 1–472（472 aa） Chain T 1–472（472 aa）	Not recorded	C7B 2-(4-chloranylphenoxy)-~{N}-[4-[2-(4-chloranylphenoxy)ethanoylamino]cyclohexyl]ethanamide × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.21 Å
6O85 Electron cryo-microscopy of the eukaryotic translation initiation factor 2B bound to eukaryotic translation initiation factor 2 from Homo sapiens Deposited 2019-03-08	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric	Chain S 1–472（472 aa）	Not recorded	C7B 2-(4-chloranylphenoxy)-~{N}-[4-[2-(4-chloranylphenoxy)ethanoylamino]cyclohexyl]ethanamide × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.03 Å
6ZMW Structure of a human 48S translational initiation complex Deposited 2020-07-04	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 54 PDB declaration: 57-meric	Chain t 1–472（472 aa）	Not recorded	ZN ZINC ION × 2 MG MAGNESIUM ION × 89	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.70 Å
6ZP4 SARS-CoV-2 Nsp1 bound to a human 43S preinitiation ribosome complex - state 2 Deposited 2020-07-08	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 52 PDB declaration: 54-meric	Chain Y 1–472（472 aa）	Not recorded	ZN ZINC ION × 4 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.90 Å
7A09 Structure of a human ABCE1-bound 43S pre-initiation complex - State III Deposited 2020-08-07	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 52 PDB declaration: 54-meric	Chain Y 1–472（472 aa）	Not recorded	ZN ZINC ION × 4 SF4 IRON/SULFUR CLUSTER × 2 ADP ADENOSINE-5'-DIPHOSPHATE × 1 MG MAGNESIUM ION × 3 ATP ADENOSINE-5'-TRIPHOSPHATE × 1 MET METHIONINE × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.6 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.50 Å
7D43 eIF2B-eIF2(aP), aPg complex Deposited 2020-09-22	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: tetradecameric	Chain P 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.30 Å
7F66 eIF2B-SFSV NSs-1-eIF2 Deposited 2021-06-24	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 15 PDB declaration: pentadecameric	Chain S 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.76 Å
7F67 eIF2B-SFSV NSs-2-eIF2 Deposited 2021-06-24	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 18 PDB declaration: octadecameric	Chain S 1–472（472 aa） Chain T 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.59 Å
7QP6 Structure of the human 48S initiation complex in open state (h48S AUG open) Deposited 2022-01-03	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 50 PDB declaration: 53-meric	Chain t 1–472（472 aa）	Not recorded	ZN ZINC ION × 2 MG MAGNESIUM ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5；20 mM Hepes, pH 7.5, 95 mM KOAc, 3.75 mM Mg(OAc)2, 1 mM ATP, 0.5 mM GTP, 0.25 mM spermidine, 2 mM DTT, 0.4 U/uL RiboLock RNase inhibitor cryo-EM vitrification conditions Cryogen ETHANE；Cryo-EM grids were prepared by floating home-made continuous carbon on 40 ul sample in the wells of teflon block (custom-made). The sample-covered carbon was then adsorbed to an EM grid.	Resolution 4.70 Å
7QP7 Structure of the human 48S initiation complex in closed state (h48S AUG closed) Deposited 2022-01-03	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 48 PDB declaration: 51-meric	Chain t 1–472（472 aa）	Not recorded	ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5；20 mM Hepes, pH 7.5, 95 mM KOAc, 3.75 mM Mg(OAc)2, 1 mM ATP, 0.5 mM GTP, 0.25 mM spermidine, 2 mM DTT, 0.4 U/uL RiboLock RNase inhibitor cryo-EM vitrification conditions Cryogen ETHANE；Cryo-EM grids were prepared by floating home-made continuous carbon on 40 ul sample in the wells of teflon block (custom-made). The sample-covered carbon was then adsorbed to an EM grid.	Resolution 3.70 Å
8OZ0 Structure of a human 48S translation initiation complex with eIF4F and eIF4A Deposited 2023-05-06	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 54 PDB declaration: 57-meric	Chain E 1–472（472 aa）	Not recorded	ZN ZINC ION × 2 MG MAGNESIUM ION × 89	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.50 Å
8PHD Structure of Human Cdc123 bound to domain 3 of eIF2 gamma and ATP Deposited 2023-06-19	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 363–472（110 aa）	Not recorded	ATP ADENOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；20% PEG3350 0.2 M lithium citrate 1 mM ATP 5 mM MgCl2	Resolution 2.08 Å R-free 0.205
8PHD Structure of Human Cdc123 bound to domain 3 of eIF2 gamma and ATP Deposited 2023-06-19	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain D 363–472（110 aa）	Not recorded	ATP ADENOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；20% PEG3350 0.2 M lithium citrate 1 mM ATP 5 mM MgCl2	Resolution 2.08 Å R-free 0.205
8PHV Structure of Human selenomethionylated Cdc123 bound to domain 3 of eIF2 gamma Deposited 2023-06-20	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 363–472（110 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	ATP ADENOSINE-5'-TRIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；20% PEG3350, 8% tacsimate	Resolution 1.97 Å R-free 0.222
8PHV Structure of Human selenomethionylated Cdc123 bound to domain 3 of eIF2 gamma Deposited 2023-06-20	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain D 363–472（110 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	ATP ADENOSINE-5'-TRIPHOSPHATE × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；277 K；20% PEG3350, 8% tacsimate	Resolution 1.97 Å R-free 0.222
8PJ1 Structure of human 48S translation initiation complex in open codon scanning state (48S-1) Deposited 2023-06-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 51 PDB declaration: 54-meric	Chain t 1–472（472 aa）	Not recorded	MG MAGNESIUM ION × 90 ZN ZINC ION × 3 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MET METHIONINE × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；Manual blotting & plunge-freezing	Resolution 3.40 Å
8PJ2 Structure of human 48S translation initiation complex in AUG recognition state after eIF5-induced GTP hydrolysis by eIF2 (48S-2) Deposited 2023-06-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 46 PDB declaration: 49-meric	Chain t 1–472（472 aa）	Not recorded	MG MAGNESIUM ION × 87 ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；Manual blotting & plunge-freezing	Resolution 3.40 Å
8PJ3 Structure of human 48S translation initiation complex upon transfer of initiator tRNA to eIF5B (48S-3) Deposited 2023-06-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 51 PDB declaration: 54-meric	Chain t 1–472（472 aa）	Not recorded	GTP GUANOSINE-5'-TRIPHOSPHATE × 1 NA SODIUM ION × 1 MG MAGNESIUM ION × 89 ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；Manual blotting & plunge-freezing	Resolution 3.70 Å
8PJ4 Structure of human 48S translation initiation complex after eIF5 release (48S-4) Deposited 2023-06-22	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 50 PDB declaration: 53-meric	Chain t 1–472（472 aa）	Not recorded	GTP GUANOSINE-5'-TRIPHOSPHATE × 1 NA SODIUM ION × 1 MG MAGNESIUM ION × 89 ZN ZINC ION × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE；Manual blotting & plunge-freezing	Resolution 3.20 Å
8PPL MERS-CoV Nsp1 bound to the human 43S pre-initiation complex Deposited 2023-07-07	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein–RNA Heteromer；Protein × 50 PDB declaration: 52-meric	Chain It 1–472（472 aa）	Not recorded	ZN ZINC ION × 4 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 MG MAGNESIUM ION × 116 MET METHIONINE × 1 UNX UNKNOWN LIGAND × 129	ELECTRON MICROSCOPY cryo-EM buffer pH 7.4 cryo-EM vitrification conditions Cryogen ETHANE-PROPANE	Resolution 2.65 Å
8QZZ Crystal structure of human eIF2 alpha-gamma complexed with PPP1R15A_420-452 Deposited 2023-10-30	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 1–472（472 aa）	Not recorded	GNP PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；11-12% PEG 6000, 0.1M Tris-HCl pH8.5 supplemented with amino acids	Resolution 3.35 Å R-free 0.299
9HVE Native human eIF2-eIF2B complex Deposited 2024-12-27	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 16 PDB declaration: hexadecameric	Chain O 1–472（472 aa） Chain P 1–472（472 aa）	Not recorded	GTP GUANOSINE-5'-TRIPHOSPHATE × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.70 Å
9HVF Native human PPP1R15B-P-eIF2-eIF2B complex Deposited 2024-12-27	Different oligomeric state Different experimental conditions	Assembly 1 Protein heterocomplex Heteromer；Protein × 5 PDB declaration: pentameric	Chain D 1–472（472 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.80 Å

28 other PDB entries and 30 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	IF2G_HUMAN
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain t； PDBConstruct 1–472； UniProt 1–472

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

Download Download SAXS (.dat) P(r) (.pr.out) CIF

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	6ybv
Deposition date deposition_date	2020-03-17
Structure title title	Structure of a human 48S translational initiation complex - eIF2-TC
Keywords keywords	ribosome, translation, initiation complex; TRANSLATION
Experimental Method method	ELECTRON MICROSCOPY

▼

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier	37.20 Å
Radius of gyration Rg (electron density) rg_electron	37.73 Å
Forward intensity I(0) i0	225183000.00
Molecular weight molecular_weight	97010.0 kDa
Excluded volume excluded_volume	111090 Å³
Envelope volume envelope_volume	192230 Å³
Hydration-shell volume shell_volume	42802 Å³
Envelope diameter envelope_diameter	125.9 Å
Shell Rg shell_rg	43.43 Å
Envelope Rg envelope_rg	36.86 Å
Shape Rg shape_rg	37.83 Å
Total Rg total_rg	37.84 Å
Total atoms total_atoms	6731
Residues n_residues	847
Spherical-harmonic order n_harmonics	20
q range q_range	— – 0.5000 Å⁻¹
Data points n_points	101
Shell type shell_type	directional
Solvent electron density solvent_density	0.3340 e/Å³
Shell contrast contrast_shell	0.0300 e/Å³
CRYSOL version crysol_version	4.1.3

▼

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax	120.0 Å
Rg (real space) rg_real	37.22 Å
Rg uncertainty (real space) rg_real_error	0.82 Å
I(0) (real space) i0_real	2.2520e+08
I(0) uncertainty (real space) i0_real_error	3.4890e+06
Rg (reciprocal space) rg_reciprocal	37.21 Å
I(0) (reciprocal space) i0_reciprocal	225200000.0000
Solution quality estimate total_estimate	0.9002
Solution quality rating solution_quality	EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks	1
Primary peak position r_peak_primary	39.1 Å
Skewness Skewness skewness	0.251
Kurtosis Kurtosis kurtosis	-0.655
Angular range angular_range	— – 0.2150 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	12840000.0000
Real-space data points n_real_points	44
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.948; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.953; Smooth: 0.902

▶

5. Crystallography and Experiment 5. Crystallography & Experiment

▶

6. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Description description	Eukaryotic translation initiation factor 2 subunit 2
Molecular weight formula_weight	38454.5 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	s
Atom count atom_count	6731

MSGDEMIFDPTMSKKKKKKKKPFMLDEEGDTQTEETQPSETKEVEPEPTEDKDLEADEEDTRKKDASDDLDDLNFFNQKKKKKKTKKIFDIDEAEEGVKDLKIESDVQEPTEPEDDLDIMLGNKKKKKKNVKFPDEDEILEKDEALEDEDNKKDDGISFSNQTGPAWAGSERDYTYEELLNRVFNIMREKNPDMVAGEKRKFVMKPPQVVRVGTKKTSFVNFTDICKLLHRQPKHLLAFLLAELGTSGSIDGNNQLVIKGRFQQKQIENVLRRYIKEYVTCHTCRSPDTILQKDTRLYFLQCETCHSRCSVASIKTGFQAVTGKRAQLRAKAN

Entity 2 Entity 2 polymer

Description description	Eukaryotic translation initiation factor 2 subunit 1
Molecular weight formula_weight	36161.2 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	r

MPGLSCRFYQHKFPEVEDVVMVNVRSIAEMGAYVSLLEYNNIEGMILLSELSRRRIRSINKLIRIGRNECVVVIRVDKEKGYIDLSKRRVSPEEAIKCEDKFTKSKTVYSILRHVAEVLEYTKDEQLESLFQRTAWVFDDKYKRPGYGAYDAFKHAVSDPSILDSLDLNEDEREVLINNINRRLTPQAVKIRADIEVACYGYEGIDAVKEALRAGLNCSTENMPIKINLIAPPRYVMTTTTLERTEGLSVLSQAMAVIKEKIEEKRGVFNVQMEPKVVTDTDETELARQMERLERENAEVDGDDDAEEMEAKAED

Entity 3 Entity 3 polymer

Description description	Initiator methionine tRNA
Molecular weight formula_weight	24231.5 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polyribonucleotide
Chain IDs strand_id	w

AGCAGAGUGGCGCAGCGGAAGCGUGCUGGGCCCAUAACCCAGAGGUCGAUGGAUCGAAACCAUCCUCUGCUACCA

Entity 4 Entity 4 polymer

Description description	mRNA
Molecular weight formula_weight	942.7 kDa
Source method src_method	syn
Copy count entity_count	1

Polymer Polymer

Polymer type type	polyribonucleotide
Chain IDs strand_id	k

AAA

Entity 5 Entity 5 polymer

Description description	Eukaryotic translation initiation factor 2 subunit 3
Molecular weight formula_weight	51178.4 kDa
EC 编号 ec_number	3.6.5.3
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	t

MAGGEAGVTLGQPHLSRQDLTTLDVTKLTPLSHEVISRQATINIGTIGHVAHGKSTVVKAISGVHTVRFKNELERNITIKLGYANAKIYKLDDPSCPRPECYRSCGSSTPDEFPTDIPGTKGNFKLVRHVSFVDCPGHDILMATMLNGAAVMDAALLLIAGNESCPQPQTSEHLAAIEIMKLKHILILQNKIDLVKESQAKEQYEQILAFVQGTVAEGAPIIPISAQLKYNIEVVCEYIVKKIPVPPRDFTSEPRLIVIRSFDVNKPGCEVDDLKGGVAGGSILKGVLKVGQEIEVRPGIVSKDSEGKLMCKPIFSKIVSLFAEHNDLQYAAPGGLIGVGTKIDPTLCRADRMVGQVLGAVGALPEIFTELEISYFLLRRLLGVRTEGDKKAAKVQKLSKNEVLMVNIGSLSTGGRVSAVKADLGKIVLTNPVCTEVGEKIALSRRVEKHWRLIGWGQIRRGVTIKPTVDDD

▼

7. Fold Classification (SCOP + CATH) 3 domains

CATH v4.4 (3 domains)

Domain ID domain_id	6ybvr01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	50 — OB fold (Dihydrolipoamide Acetyltransferase, E2P)
Homologous superfamily homologous superfamily	140 — Nucleic acid-binding proteins

Domain ID domain_id	6ybvr02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	150 — DNA polymerase; domain 1
Homologous superfamily homologous superfamily	190 — Translation initiation factor 2; subunit 1; domain 2

Domain ID domain_id	6ybvr03
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	1130 — EIF_2_alpha

▶

8. Citations (1)

▶

Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	—

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	triclinic

Resolution resolution	3.80 Å
Resolution测定方法 resolution_method	—
颗粒数 num_particles	33706

fit	/app/data/saxs_computation/yb/6ybv/6ybv.fit
pddf	/app/data/pr_computation/yb/6ybv/6ybv.pr.out
profile	/app/data/saxs_computation/yb/6ybv/6ybv.dat

Structure of a human 48S translational initiation complex - eIF2-TC

1. Protein Identity and Related Structures Protein Identity & Related Structures

Eukaryotic translation initiation factor 2 subunit 2

State in the Current Structure

Other States of the Same Protein in the Database

Eukaryotic translation initiation factor 2 subunit 1

State in the Current Structure

Other States of the Same Protein in the Database

Eukaryotic translation initiation factor 2 subunit 3

State in the Current Structure

Other States of the Same Protein in the Database

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

2. Structure Basics 2. Structure Basics

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

5. Crystallography and Experiment 5. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

6. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

Entity 5 Entity 5 polymer

Polymer Polymer

7. Fold Classification (SCOP + CATH) 3 domains

CATH v4.4 (3 domains)

8. Citations (1)

9. Files and Curves (10)

Files (7)

Curves (3)