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Protein Structures and Oligomeric States

Enter a protein name, UniProt accession or PDB ID. Name searches ask you to confirm the protein identity before related structures are queried.

Current Protein Identity：O75575 New Search
29PDB entries
29Biological assembly
29chain/assembly records
Main Difference Dimensions in This Set
Different assembly state Different ligand/ion Different experimental conditions Different structure-quality metrics

Difference tags compare only the current result set; every original PDB and assembly record remains separate.

Related-Structure Differences

Each row represents one biological assembly in one PDB entry; multiple monomers of the same protein are listed separately.

PDB Entry Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Experimental Method Experimental Conditions Structure Quality
7A6H Cryo-EM structure of human apo RNA Polymerase III Deposited 2020-08-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 17 PDB declaration: heptadecameric（17） Consistent with protein count
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；Wait time 10 s Blot force 4 Blot time 4 s
Resolution 3.30 Å
7AE1 Cryo-EM structure of human RNA Polymerase III elongation complex 1 Deposited 2020-09-17 Assembly 1 Other combination Heteromer；Protein × 17 PDB declaration: eicosameric（20） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 SF4 IRON/SULFUR CLUSTER × 1 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；Wait time 10 s Blot force 4 Blot time 4 s
Resolution 2.80 Å
7AE3 Cryo-EM structure of human RNA Polymerase III elongation complex 3 Deposited 2020-09-17 Assembly 1 Other combination Heteromer；Protein × 17 PDB declaration: eicosameric（20） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 SF4 IRON/SULFUR CLUSTER × 1 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；Wait time 10 s Blot force 4 Blot time 4 s
Resolution 3.10 Å
7AEA Cryo-EM structure of human RNA Polymerase III elongation complex 2 Deposited 2020-09-17 Assembly 1 Other combination Heteromer；Protein × 17 PDB declaration: eicosameric（20） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 SF4 IRON/SULFUR CLUSTER × 1 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；Wait time 10 s Blot force 4 Blot time 4 s
Resolution 3.40 Å
7AST Apo Human RNA Polymerase III Deposited 2020-10-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 17 PDB declaration: heptadecameric（17） Consistent with protein count
Chain I 1–148（148 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.00 Å
7D58 cryo-EM structure of human RNA polymerase III in elongating state Deposited 2020-09-25 Assembly 1 Other combination Heteromer；Protein × 17 PDB declaration: eicosameric（20） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.90 Å
7D59 cryo-EM structure of human RNA polymerase III in apo state Deposited 2020-09-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 17 PDB declaration: heptadecameric（17） Consistent with protein count
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
7DN3 Structure of Human RNA Polymerase III elongation complex Deposited 2020-12-08 Assembly 1 Other combination Heteromer；Protein × 17 PDB declaration: eicosameric（20） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded MG MAGNESIUM ION × 1 ZN ZINC ION × 6 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.50 Å
7DU2 RNA polymerase III EC complex in post-translocation state Deposited 2021-01-07 Assembly 1 Other combination Heteromer；Protein × 17 PDB declaration: eicosameric（20） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded MG MAGNESIUM ION × 1 ZN ZINC ION × 6 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.35 Å
7FJI human Pol III elongation complex Deposited 2021-08-04 Assembly 1 Other combination Heteromer；Protein × 17 PDB declaration: eicosameric（20） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
Resolution 3.60 Å
7FJJ human Pol III pre-termination complex Deposited 2021-08-04 Assembly 1 Other combination Heteromer；Protein × 17 PDB declaration: eicosameric（20） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded MG MAGNESIUM ION × 1 ZN ZINC ION × 7 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
Resolution 3.60 Å
8ITY human RNA polymerase III pre-initiation complex closed DNA 1 Deposited 2023-03-23 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.90 Å
8IUE RNA polymerase III pre-initiation complex melting complex 1 Deposited 2023-03-24 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 8 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 4.10 Å
8IUH RNA polymerase III pre-initiation complex open complex 1 Deposited 2023-03-24 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 8 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.40 Å
9FSO Human RNA Polymerase III Class III Open Pre-initiation Complex 1 (OC1) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain I 1–148（148 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.28 Å
9FSP RNA Polymerase III Class III Open Pre-initation Complex 2 (OC2) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain I 1–148（148 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.39 Å
9FSQ RNA Polymerase III Class III Melting Pre-Initiation Complex (MC) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain I 1–148（148 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.51 Å
9FSR RNA Polymerase III Class III Open Mini Pre-initiation Complex 1 (OC1-mini) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain I 1–148（148 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.76 Å
9FSS RNA Polymerase III Class III Open Mini Pre-Initiation complex 2 (OC2-mini) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain I 1–148（148 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.14 Å
9K2G Human RNA Polymerase III de novo transcribing complex 13 (TC13) Deposited 2024-10-17 Assembly 1 Other combination Heteromer；Protein × 18 PDB declaration: 21-meric（21） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 6 MG MAGNESIUM ION × 1 3AT 3'-DEOXYADENOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.00 Å
9K36 Human RNA Polymerase III de novo transcribing complex 12 (TC12) Deposited 2024-10-18 Assembly 1 Other combination Heteromer；Protein × 18 PDB declaration: 21-meric（21） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 6 MG MAGNESIUM ION × 1 3AT 3'-DEOXYADENOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 2.90 Å
9K38 Human RNA Polymerase III de novo transcribing complex 6 (TC6) Deposited 2024-10-18 Assembly 1 Other combination Heteromer；Protein × 18 PDB declaration: 21-meric（21） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 6 MG MAGNESIUM ION × 1 3AT 3'-DEOXYADENOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.10 Å
9K39 Human RNA Polymerase III de novo transcribing complex 8 (TC8) Deposited 2024-10-18 Assembly 1 Other combination Heteromer；Protein × 18 PDB declaration: 21-meric（21） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 6 MG MAGNESIUM ION × 1 3AT 3'-DEOXYADENOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 2.80 Å
9K3B Human RNA Polymerase III de novo transcribing complex 10 overall (TC10-overall) Deposited 2024-10-18 Assembly 1 Other combination Heteromer；Protein × 23 PDB declaration: 26-meric（26） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 6 MG MAGNESIUM ION × 1 3AT 3'-DEOXYADENOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 4.80 Å
9K3U Human RNA Polymerase III de novo transcribing complex 5 (TC5) Deposited 2024-10-20 Assembly 1 Other combination Heteromer；Protein × 23 PDB declaration: 26-meric（26） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.00 Å
9K3V Human RNA Polymerase III de novo transcribing complex 4 (TC4) Deposited 2024-10-20 Assembly 1 Other combination Heteromer；Protein × 23 PDB declaration: 26-meric（26） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 3AT 3'-DEOXYADENOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 1 MG MAGNESIUM ION × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.50 Å
9LKT Human RNA Polymerase III de novo transcribing complex 10 (TC10) Deposited 2025-01-16 Assembly 1 Other combination Heteromer；Protein × 18 PDB declaration: 21-meric（21） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 6 MG MAGNESIUM ION × 1 3AT 3'-DEOXYADENOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.50 Å
9LXN Human RNA Polymerase III de novo transcribing complex 5 (TC5)(without 3'dATP) Deposited 2025-02-18 Assembly 1 Other combination Heteromer；Protein × 23 PDB declaration: 26-meric（26） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 7 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.30 Å
9LXO Human RNA Polymerase III de novo transcribing complex 6 (TC6)(without 3'dATP) Deposited 2025-02-18 Assembly 1 Other combination Heteromer；Protein × 18 PDB declaration: 21-meric（21） Consistent with all polymers
Chain D 1–148（148 aa）
Not recorded ZN ZINC ION × 6 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.60 Å

This page presents structural evidence recorded in PDB/mmCIF.“No recorded non-water small molecule” does not prove that the experimental sample was ligand-free; experimental conditions belong to the PDB experiment, while ligands and copy counts are shown for each biological assembly.