9t8z

Room temperature X-ray structure of the B1 domain of streptococcal protein G triple mutant T2Q, N8D, and N37D (GB1-QDD).

Method: X-RAY DIFFRACTION Dmax: 56.2 Å Quality: GOOD

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

Immunoglobulin G-binding protein G

Streptococcus sp.

UniProt P19909

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 monomer Monomer Protein × 1 PDB declaration: monomeric(1) Consistent with protein copy count Chain A; UniProt 303–357 Not recorded NA SODIUM ION × 1 X-RAY DIFFRACTION X-ray crystallization conditions:MICRODIALYSIS;278 K;50 % 2-methyl-2,4-pentanediol (MPD), 25 % isopropanol Resolution 1.69 Å R-free 0.197
2 Protein monomer Monomer Protein × 1 PDB declaration: monomeric(1) Consistent with protein copy count Chain B; UniProt 303–357 Not recorded No other associated polymer X-RAY DIFFRACTION X-ray crystallization conditions:MICRODIALYSIS;278 K;50 % 2-methyl-2,4-pentanediol (MPD), 25 % isopropanol Resolution 1.69 Å R-free 0.197

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.

76 other PDB entries and 115 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name SPG2_STRSG
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 2–56; UniProt 303–357 Author chain B; PDBConstruct 2–56; UniProt 303–357

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 9t8z

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 9t8z
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2. Structure Basics 2. Structure Basics

Entry ID entry_id9t8z
Deposition date deposition_date2025-11-13
Structure title titleRoom temperature X-ray structure of the B1 domain of streptococcal protein G triple mutant T2Q, N8D, and N37D (GB1-QDD).
Keywords keywordsB1 domain, triple mutant, IMMUNE SYSTEM; IMMUNE SYSTEM
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier16.55
Radius of gyration Rg (electron density) rg_electron15.93
Forward intensity I(0) i03118200.00
Molecular weight molecular_weight12358.0 kDa
Excluded volume excluded_volume15396 ų
Envelope volume envelope_volume18250 ų
Hydration-shell volume shell_volume10662 ų
Envelope diameter envelope_diameter54.9
Shell Rg shell_rg20.02
Envelope Rg envelope_rg16.03
Shape Rg shape_rg15.88
Total Rg total_rg16.91
Total atoms total_atoms870
Residues n_residues112
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 dmax56.2
Rg (real space) rg_real16.63
Rg uncertainty (real space) rg_real_error0.42
I(0) (real space) i0_real3.1180e+06
I(0) uncertainty (real space) i0_real_error3.7770e+04
Rg (reciprocal space) rg_reciprocal16.62
I(0) (reciprocal space) i0_reciprocal3118000.0000
Solution quality estimate total_estimate0.8569
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary16.1
Skewness Skewness skewness0.464
Kurtosis Kurtosis kurtosis-0.216
Angular range angular_range— – 0.4800 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha650400.0000
Real-space data points n_real_points78
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.762; Stabil: 0.999; Sysdev: 1.000; Positv: 1.000; Valcen: 0.909; Smooth: 0.942

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (3)

8. Citations (2)

9. Files and Curves (10)