Csd3 (also known as HdpA) is a bi-functional enzyme with delta,delta-endopeptidase activity and delta,delta-carboxypeptidase activity. The N-terminal domain is also known as domain 1 and is composed of an alpha/beta fold consisting of a five-stranded ...
Csd3 (also known as HdpA) is a bi-functional enzyme with delta,delta-endopeptidase activity and delta,delta-carboxypeptidase activity. The N-terminal domain is also known as domain 1 and is composed of an alpha/beta fold consisting of a five-stranded antiparallel beta-sheet and three short alpha-helices. Domain 1 blocks the active-site cleft of the LytM domain, with the protruding helix alpha-3 contributing to the Zn2+ coordination sphere. The fold of domain 1 is very remotely related to monellin/cystatin superfamily proteins, some of which act as inhibitors of cysteine peptidases [1].
This entry represents the second domain from the Csd3 peptidase [2]. This domain has a similar structure to Pfam:PF18059 despite low sequence similarity [2].