2cex

X-ray diffraction
2.2Å resolution

Structure of a sialic acid binding protein (SiaP) in the presence of the sialic acid acid analogue Neu5Ac2en

Released:

Function and Biology Details

Structure analysis Details

Assembly composition:
monomeric (preferred)
PDBe Complex ID:
PDB-CPX-155185 (preferred)
Entry contents:
1 distinct polypeptide molecule
Macromolecule:
Sialic acid-binding periplasmic protein SiaP Chains: A, B, C, D
Molecule details ›
Chains: A, B, C, D
Length: 306 amino acids
Theoretical weight: 34.2 KDa
Source organism: Haemophilus influenzae
Expression system: Escherichia coli BL21(DE3)
UniProt:
  • Canonical: P44542 (Residues: 24-329; Coverage: 100%)
Gene names: HI_0146, siaP
Sequence domains: Bacterial extracellular solute-binding protein, family 7
Structure domains: Bacterial extracellular solute-binding protein, family 7

Ligands and Environments

3 bound ligands:
No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: ESRF BEAMLINE BM14
Spacegroup: C2
Unit cell:
a: 131.448Å b: 88.701Å c: 115.912Å
α: 90° β: 105.33° γ: 90°
R-values:
R R work R free
0.201 0.197 0.28
Expression system: Escherichia coli BL21(DE3)