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1zo1

IF2, IF1, and tRNA fitted to cryo-EM data OF E. COLI 70S initiation complex

Method: ELECTRON MICROSCOPY
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1. Protein Identity and Related Structures Protein Identity & Related Structures

translation initiation factor 2

OrganismNot specified

UniProt P0A705

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein–RNA Heteromer Protein 2 RNA 1 P/I-site tRNA × 1 translation Initiation Factor 1 × 1 （P69222） Consistent with all polymers

Other States of the Same Protein in the Database

Monomer
1nd9

1 assemblies

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1zo1 3jcj 3jcn 5me0 5me1

5 assemblies

View Construct and Data Evidence
UniProt name IF2_ECOLI
Isoform —
PDB entities 2
Chains and sequence ranges Author chain I； PDBConstruct 1–501； UniProt 388–888

translation Initiation Factor 1

OrganismNot specified

UniProt P69222

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein–RNA Heteromer Protein 2 RNA 1 P/I-site tRNA × 1 translation initiation factor 2 × 1 （P0A705） Consistent with all polymers

Other States of the Same Protein in the Database

Monomer
1ah9

1 assemblies

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1zo1 9fco 9fda 9fib 9g06 9h9h 9h9j 9ss0 9ss1 9ss2

10 assemblies

View Construct and Data Evidence
UniProt name IF1_ECOLI
Isoform —
PDB entities 3
Chains and sequence ranges Author chain W； PDBConstruct 22–61； UniProt 21–60

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.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id1zo1
Deposition date deposition_date2005-05-12
Structure title titleIF2, IF1, and tRNA fitted to cryo-EM data OF E. COLI 70S initiation complex
Keywords keywordsE. COLI, RIBOSOME, INITIATION OF PROTEIN SYNTHESIS, INITIATION FACTOR, CRYO-ELETRON MICROSCOPY, translation-RNA COMPLEX; translation/RNA
Experimental Method methodELECTRON MICROSCOPY
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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

1zo1__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1zo1__assembly_1__model_1 | I(q)

10-2 10-1 106 107 108 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

1zo1__assembly_1__model_1 | P(r) · Pending

The new assembly/model P(r) has not been calculated yet This placeholder does not display legacy data r (Angstrom) P(r)
P(r) will be calculated and displayed separately for the same assembly/model.
Rg（Guinier）53.21 Å
Rg (electron density)52.07 Å
Total Rg52.23 Å
Atom count5992
Residues648
Excluded volume101040 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 1zo1__assembly_1__model_1 trimeric （3） Success 4.1.3-1-20251215 (887e7ef) View Download
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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (3)

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6. Fold Classification (SCOP + CATH) 1 domains

SCOP 2.08 (1 domains)

Domain ID domain_idd1zo1w1
Class classb — All beta proteins
Fold Fold foldb.40 — OB-fold
Superfamily Superfamily superfamilyb.40.4 — Nucleic acid-binding proteins
Family Family familyb.40.4.5 — Cold shock DNA-binding domain-like
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7. Citations (1)