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5ffi

[2Fe:2S] ferredoxin FeSII from Azotobacter vinelandii

Method: X-RAY DIFFRACTION
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1. Protein Identity and Related Structures Protein Identity & Related Structures

Dimeric (2Fe-2S) protein

Azotobacter vinelandii

UniProt Q44501

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein homooligomer Homooligomer Protein 2 FE2/S2 (INORGANIC) CLUSTER × 2 water × 2 Consistent with protein count
2 Protein homooligomer Homooligomer Protein 2 FE2/S2 (INORGANIC) CLUSTER × 2 water × 2 Consistent with protein count
3 Protein homooligomer Homooligomer Protein 2 FE2/S2 (INORGANIC) CLUSTER × 2 water × 2 Consistent with protein count
4 Protein homooligomer Homooligomer Protein 2 FE2/S2 (INORGANIC) CLUSTER × 2 water × 2 Consistent with protein count
5 Protein monomer Monomer Protein 1 FE2/S2 (INORGANIC) CLUSTER × 1 water × 1 Consistent with protein count

Other States of the Same Protein in the Database

Monomer
5ffi 5frt

2 assemblies

Homodimer
5ffi 5ffi 5ffi 5ffi 5frt 5frt 5frt 6yav 6yav 6yav

10 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
8rhp 9cu0 9cu1 9cu2

4 assemblies

View Construct and Data Evidence
UniProt name Q44501_AZOVI
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–122； UniProt 1–122 Author chain B； PDBConstruct 1–122； UniProt 1–122 Author chain C； PDBConstruct 1–122； UniProt 1–122 Author chain D； PDBConstruct 1–122； UniProt 1–122 Author chain E； PDBConstruct 1–122； UniProt 1–122

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_id5ffi
Deposition date deposition_date2015-12-18
Structure title title[2Fe:2S] ferredoxin FeSII from Azotobacter vinelandii
Keywords keywordsferredoxin, nitrogen fixation, Shethna protein II, FeSII, nitrogenase, Metal Binding Protein; METAL BINDING PROTEIN
Experimental Method methodX-RAY DIFFRACTION
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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.

5ffi__assembly_3__model_1

Assembly 3 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

5ffi__assembly_3__model_1 | I(q)

10-2 10-1 105 106 107 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

5ffi__assembly_3__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）21.65 Å
Rg (electron density)20.97 Å
Total Rg21.76 Å
Atom count1799
Residues233
Excluded volume32312 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 5ffi__assembly_1__model_1 dimeric （2） Success 4.1.3-1-20251215 (887e7ef) View Download
2 1 5ffi__assembly_2__model_1 dimeric （2） Success 4.1.3-1-20251215 (887e7ef) View Download
3 1 5ffi__assembly_3__model_1 dimeric （2） Success 4.1.3-1-20251215 (887e7ef) View Download
4 1 5ffi__assembly_4__model_1 dimeric （2） Success 4.1.3-1-20251215 (887e7ef) View Download
5 1 5ffi__assembly_5__model_1 monomeric （1） 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

CATH v4.4 (1 domains)

Domain ID domain_id5ffiE00
Class class3 — Alpha Beta
Architecture architecture10 — Roll
Topology topology20 — Ubiquitin-like (UB roll)
Homologous superfamily homologous superfamily30 — Beta-grasp domain
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7. Citations (1)