This entry corresponds to the N-terminal domain of cytosolic carboxypeptidases. The N-terminal domain folds into a nine-stranded antiparallel beta sandwich [1]. This domain is specific to CCP proteins and is absent in other carboxypeptidases. It has been hypothesised that the N-terminal domain might contribute to folding, might have a regulatory function and/or might be involved in binding other proteins.

1: High-resolution structure of the M14-type cytosolic carboxypeptidase from Burkholderia cenocepacia refined exploiting PDB_REDO strategies. Rimsa V, Eadsforth TC, Joosten RP, Hunter WN; Acta Crystallogr D Biol Crystallogr. 2014;70:279-289. PMID:24531462