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4f2d

Crystal Structure of Escherichia coli L-arabinose Isomerase (ECAI) complexed with Ribitol

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

L-arabinose isomerase

Escherichia coli

UniProt P08202

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein homooligomer Homooligomer Protein 6 MANGANESE (II) ION × 6 D-ribitol × 6 ACETIC ACID × 2 water × 6 Consistent with protein count
2 Protein homooligomer Homooligomer Protein 3 MANGANESE (II) ION × 3 D-ribitol × 3 ACETIC ACID × 1 water × 3 Consistent with protein count

Other States of the Same Protein in the Database

Monomer

None

Homodimer

None

Homotetramer

None

Other homooligomers
2ajt 4f2d 4f2d

3 assemblies

Heteromeric or nucleic-acid complex
7chl 7chl

2 assemblies

View Construct and Data Evidence
UniProt name ARAA_ECOLI
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–500； UniProt 1–500 Author chain B； PDBConstruct 1–500； UniProt 1–500 Author chain C； PDBConstruct 1–500； UniProt 1–500

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_id4f2d
Deposition date deposition_date2012-05-07
Structure title titleCrystal Structure of Escherichia coli L-arabinose Isomerase (ECAI) complexed with Ribitol
Keywords keywords;Structural Genomics, PSI-1, Protein Structure Initiative, New York SGX Research Center for Structural Genomics, NYSGXRC, ISOMERASE, Sugar Binding ;; ISOMERASE
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.

4f2d__assembly_1__model_1

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

Download this curve (.dat)

4f2d__assembly_1__model_1 | I(q)

10-2 10-1 106 107 108 109 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

4f2d__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）42.99 Å
Rg (electron density)42.17 Å
Total Rg42.48 Å
Atom count23118
Residues2886
Excluded volume409750 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 4f2d__assembly_1__model_1 hexameric （6） Success 4.1.3-1-20251215 (887e7ef) View Download
2 1 4f2d__assembly_2__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 (5)

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6. Fold Classification (SCOP + CATH) 9 domains

SCOP 2.08 (6 domains)

Domain ID domain_idd4f2da1
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.85 — FucI/AraA N-terminal and middle domains
Superfamily Superfamily superfamilyc.85.1 — FucI/AraA N-terminal and middle domains
Family Family familyc.85.1.2 — AraA N-terminal and middle domain-like
Domain ID domain_idd4f2da2
Class classb — All beta proteins
Fold Fold foldb.43 — Reductase/isomerase/elongation factor common domain
Superfamily Superfamily superfamilyb.43.2 — FucI/AraA C-terminal domain-like
Family Family familyb.43.2.0 — automated matches
Domain ID domain_idd4f2db1
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.85 — FucI/AraA N-terminal and middle domains
Superfamily Superfamily superfamilyc.85.1 — FucI/AraA N-terminal and middle domains
Family Family familyc.85.1.2 — AraA N-terminal and middle domain-like
Domain ID domain_idd4f2db2
Class classb — All beta proteins
Fold Fold foldb.43 — Reductase/isomerase/elongation factor common domain
Superfamily Superfamily superfamilyb.43.2 — FucI/AraA C-terminal domain-like
Family Family familyb.43.2.0 — automated matches
Domain ID domain_idd4f2dc1
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.85 — FucI/AraA N-terminal and middle domains
Superfamily Superfamily superfamilyc.85.1 — FucI/AraA N-terminal and middle domains
Family Family familyc.85.1.2 — AraA N-terminal and middle domain-like
Domain ID domain_idd4f2dc2
Class classb — All beta proteins
Fold Fold foldb.43 — Reductase/isomerase/elongation factor common domain
Superfamily Superfamily superfamilyb.43.2 — FucI/AraA C-terminal domain-like
Family Family familyb.43.2.0 — automated matches

CATH v4.4 (3 domains)

Domain ID domain_id4f2dA01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily10940 —
Domain ID domain_id4f2dB01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily10940 —
Domain ID domain_id4f2dC01
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily10940 —
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7. Citations (1)