X-ray diffraction
1.2Å resolution

Structure of Streptococcal protein G B1 domain at pH 3.0


Function and Biology Details

Biochemical function:
  • not assigned
Biological process:
  • not assigned
Cellular component:
Sequence domain:

Structure analysis Details

Assemblies composition:
monomeric (preferred)
homo dimer
Entry contents:
1 distinct polypeptide molecule
Immunoglobulin G-binding protein G Chains: A, B
Molecule details ›
Chains: A, B
Length: 64 amino acids
Theoretical weight: 7.22 KDa
Source organism: Streptococcus sp. 'group G'
Expression system: Escherichia coli BL21(DE3)
  • Canonical: P06654 (Residues: 227-282; Coverage: 14%)
Gene name: spg
Sequence domains: B domain
Structure domains: Ubiquitin-like (UB roll)

Ligands and Environments

1 bound ligand:

No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: DIAMOND BEAMLINE I02
Spacegroup: P32
Unit cell:
a: 34.81Å b: 34.81Å c: 71.788Å
α: 90° β: 90° γ: 120°
R R work R free
0.15 0.148 0.181
Expression system: Escherichia coli BL21(DE3)