Peptidoglycan reshaping by a noncanonical peptidase for helical cell shape in Campylobacter jejuni

Peptidoglycans (PG) define bacterial cell shapes. Here, the authors provide mechanistic insights into the peptidoglycan peptidase 3 (Pgp3) from the spiral shaped human pathogen Campylobacter jejuni by determining its crystal structure alone and in complex with synthetic cell-wall PG derivatives, and they further show that the enzyme has both d,d-endopeptidase and d,d-carboxypeptidase activities