2y3f

Traptavidin, biotin bound form

Method: X-RAY DIFFRACTION

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

STREPTAVIDIN

STREPTOMYCES AVIDINII

UniProt P22629

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein homooligomer Homooligomer Protein 4 BIOTIN × 4 GLYCEROL × 12 water × 4 Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence
UniProt name SAV_STRAV
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 2–128; UniProt 37–163

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.

2. Structure Basics 2. Structure Basics

Entry ID entry_id2y3f
Deposition date deposition_date2010-12-20
Structure title titleTraptavidin, biotin bound form
Keywords keywordsBIOTIN-BINDING PROTEIN, PROTEIN ENGINEERING; BIOTIN-BINDING PROTEIN
Experimental Method methodX-RAY DIFFRACTION

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.

2y3f__assembly_1__model_1

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

Download this curve (.dat)

2y3f__assembly_1__model_1 | I(q)

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

2y3f__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)22.37 Å
Rg (electron density)21.30 Å
Total Rg22.24 Å
Atom count3728
Residues484
Excluded volume65106 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 2y3f__assembly_1__model_1 tetrameric (4) Success 4.1.3-1-20251215 (887e7ef) View Download

4. Crystallography and Experiment 4. Crystallography & Experiment

5. Entities and Polymers Entities & Polymers (4)

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_idd2y3fa_
Class classb — All beta proteins
Fold Fold foldb.61 — Streptavidin-like
Superfamily Superfamily superfamilyb.61.1 — Avidin/streptavidin
Family Family familyb.61.1.1 — Avidin/streptavidin

CATH v4.4 (1 domains)

Domain ID domain_id2y3fA00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology128 — Lipocalin
Homologous superfamily homologous superfamily30 — Avidin-like

7. Citations (1)