Lactococcus X-Pro dipeptidyl-peptidase proteins belong to the S15 family of the carboxypeptidase (SC) clan. These proteins, which have similar pecificity to mammalian dipeptidyl-peptidase IV, cleave Xaa-Pro-releasing N-terminal dipeptides. The penultimate residue must be proline. In Lactococcus, the proteins exist as cytoplasmic homodimers. The closest relative is Cocaine_esterase
Title: The Structural Basis for Catalysis and Specificity of the X-Prolyl Dipeptidyl Aminopeptidase from Lactococcus lactis Rigolet P, Mechin I, Delage M, Chich J Ref: Structure (Camb), 10:1383, 2002 : PubMed
The X-prolyl dipeptidyl aminopeptidase (X-PDAP) from Lactococcus lactis is a dimeric enzyme catalyzing the removal of Xaa-Pro dipeptides from the N terminus of peptides. The structure of the enzyme was solved at 2.2 A resolution and provides a model for the peptidase family S15. Each monomer is composed of four domains. The larger one presents an alpha/beta hydrolase fold and comprises the active site serine. The specificity pocket is mainly built by residues from a small helical domain which is, together with the N-terminal domain, essential for dimerization. A C-terminal moiety probably plays a role in the tropism of X-PDAP toward the cellular membrane. These results give new insights for further exploration of the role of the enzymes of the SC clan.
