6j6j

Biotin-bound streptavidin

Method: ELECTRON MICROSCOPY Dmax: 68.0 Å Quality: EXCELLENT

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

Streptavidin

OrganismNot specified

UniProt P22629

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein homooligomer Homooligomer Protein × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain A; UniProt 40–158 Chain B; UniProt 40–158 Chain C; UniProt 40–158 Chain D; UniProt 40–158 Not recorded BTN BIOTIN × 4 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.20 Å

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

312 other PDB entries and 368 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name SAV_STRAV
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 1–119; UniProt 40–158 Author chain B; PDBConstruct 1–119; UniProt 40–158 Author chain C; PDBConstruct 1–119; UniProt 40–158 Author chain D; PDBConstruct 1–119; UniProt 40–158

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.

SAXS scattering curve SAXS Profile

SAXS profile for 6j6j

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 6j6j
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2. Structure Basics 2. Structure Basics

Entry ID entry_id6j6j
Deposition date deposition_date2019-01-15
Structure title titleBiotin-bound streptavidin
Keywords keywordsstreptavidin, CYTOSOLIC PROTEIN; CYTOSOLIC PROTEIN
Experimental Method methodELECTRON MICROSCOPY

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier22.67
Radius of gyration Rg (electron density) rg_electron21.56
Forward intensity I(0) i046279200.00
Molecular weight molecular_weight51012.0 kDa
Excluded volume excluded_volume63053 ų
Envelope volume envelope_volume75294 ų
Hydration-shell volume shell_volume27785 ų
Envelope diameter envelope_diameter67.7
Shell Rg shell_rg29.24
Envelope Rg envelope_rg21.86
Shape Rg shape_rg21.52
Total Rg total_rg22.55
Total atoms total_atoms3612
Residues n_residues476
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 −1
Data points n_points101
Shell type shell_typedirectional
Solvent electron density solvent_density0.3340 e/ų
Shell contrast contrast_shell0.0300 e/ų
CRYSOL version crysol_version4.1.3

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax68.0
Rg (real space) rg_real22.51
Rg uncertainty (real space) rg_real_error0.27
I(0) (real space) i0_real4.6280e+07
I(0) uncertainty (real space) i0_real_error5.1330e+05
Rg (reciprocal space) rg_reciprocal22.55
I(0) (reciprocal space) i0_reciprocal46280000.0000
Solution quality estimate total_estimate0.9067
Solution quality rating solution_quality EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary29.9
Skewness Skewness skewness0.076
Kurtosis Kurtosis kurtosis-0.538
Angular range angular_range— – 0.3500 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha14840000.0000
Real-space data points n_real_points67
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.938; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.976; Smooth: 0.991

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (3)

7. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id6j6jA00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology128 — Lipocalin
Homologous superfamily homologous superfamily30 — Avidin-like
Domain ID domain_id6j6jB00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology128 — Lipocalin
Homologous superfamily homologous superfamily30 — Avidin-like
Domain ID domain_id6j6jC00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology128 — Lipocalin
Homologous superfamily homologous superfamily30 — Avidin-like
Domain ID domain_id6j6jD00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology128 — Lipocalin
Homologous superfamily homologous superfamily30 — Avidin-like

8. Citations (1)

9. Files and Curves (10)