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7efd

1.77 A cryo-EM structure of Streptavidin using first 40 frames (corresponding to about 40 e/A^2 total dose)

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

Streptavidin

OrganismNot specified

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 water × 4 Consistent with protein count
2 Protein monomer Monomer Protein 1 BIOTIN × 1 water × 1 Consistent with protein count
3 Protein monomer Monomer Protein 1 BIOTIN × 1 water × 1 Consistent with protein count

Other States of the Same Protein in the Database

Monomer
3rdm 3rdo 3rdq 3rds 3rdu 3re5 3re6 5n8t 7dy0 7dy0 7efc 7efc

14 assemblies; showing the first 12

Homodimer
1mm9 1moy 1swg 1swg 3rdx 5cse 6s4q 6s50 6uc3 6ud1 6ud6 8xg4

17 assemblies; showing the first 12

Homotetramer
1df8 1i9h 1kff 1kl4 1lcv 1lcw 1lcz 1mep 1mk5 1mm9 1mm9 1moy

262 assemblies; showing the first 12

Other homooligomers
1df8 1lcv 1lcz 1sre 1srg 1sri 2izc 2izd 2ize 2rth 2rti 2rtn

16 assemblies; showing the first 12

Heteromeric or nucleic-acid complex
1hqq 1hxl 1hxz 1hy2 1kl3 1kl5 1pts 1pts 1rst 1rsu 1sld 1sle

60 assemblies; showing the first 12

View Construct and Data Evidence
UniProt name SAV_STRAV
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–183； UniProt 1–183

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_id7efd
Deposition date deposition_date2021-03-21
Structure title title1.77 A cryo-EM structure of Streptavidin using first 40 frames (corresponding to about 40 e/A^2 total dose)
Keywords keywordsSTREPTAVIDIN, CYTOSOLIC PROTEIN; CYTOSOLIC PROTEIN
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.

7efd__assembly_1__model_1

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

Download this curve (.dat)

7efd__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.

7efd__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）22.61 Å
Rg (electron density)21.55 Å
Total Rg22.52 Å
Atom count3648
Residues480
Excluded volume63597 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 7efd__assembly_1__model_1 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
2 1 7efd__assembly_2__model_1 monomeric （1） Excluded — —
Exclusion reason： Auxiliary symmetry representation; not a complete or representative biological assembly.
3 1 7efd__assembly_3__model_1 monomeric （1） Excluded — —
Exclusion reason： Auxiliary symmetry representation; not a complete or representative biological assembly.
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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_idd7efda_
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
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7. Citations (1)