3N5I image
Deposition Date 2010-05-25
Release Date 2011-06-08
Last Version Date 2023-09-06
Entry Detail
PDB ID:
3N5I
Keywords:
Title:
Crystal structure of the precursor (S250A mutant) of the N-terminal beta-aminopeptidase BapA
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.18
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Beta-peptidyl aminopeptidase
Gene (Uniprot):bapA
Mutations:S250A
Chain IDs:A, B, C, D
Chain Length:373
Number of Molecules:4
Biological Source:Sphingosinicella xenopeptidilytica
Primary Citation
Autoproteolytic and catalytic mechanisms for the beta-aminopeptidase BapA--a member of the Ntn hydrolase family.
Structure 20 1850 1860 (2012)
PMID: 22980995 DOI: 10.1016/j.str.2012.07.017

Abstact

The β-aminopeptidase BapA from Sphingosinicella xenopeptidilytica belongs to the N-terminal nucleophile (Ntn) hydrolases of the DmpA-like family and has the unprecedented property of cleaving N-terminal β-amino acid residues from peptides. We determined the crystal structures of the native (αβ)₄ heterooctamer and of the 153 kDa precursor homotetramer at a resolution of 1.45 and 1.8 Å, respectively. These structures together with mutational analyses strongly support mechanisms for autoproteolysis and catalysis that involve residues Ser250, Ser288, and Glu290. The autoproteolytic mechanism is different from the one so far described for Ntn hydrolases. The structures together with functional data also provide insight into the discriminating features of the active site cleft that determine substrate specificity.

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Primary Citation of related structures