Tags: Enzyme.
A transpeptidase (EC 3.4.16.4 DD-peptidase DD-transpeptidase DD-carboxypeptidase D-alanyl-D-alanine carboxypeptidase D-alanyl-D-alanine-cleaving-peptidase D-alanine carboxypeptidase D-alanyl carboxypeptidase and serine-type D-Ala-D-Ala carboxypeptidase.) is a bacterial enzyme that cross-links peptidoglycan chains to form rigid cell walls.