Phosphopantetheine, also known as 4'-phosphopantetheine, is a prosthetic group of several acyl carrier proteins including the acyl carrier proteins (ACP) of fatty acid synthases, ACPs of polyketide synthases, the peptidyl carrier proteins (PCP), as well as aryl carrier proteins (ArCP) of nonribosomal peptide synthetases (NRPS).
Phosphopantetheine is a prosthetic group found in acyl carrier proteins like those of fatty acid synthases, polyketide synthases, peptidyl carrier proteins, and nonribosomal peptide synthetases. It also includes aryl carrier proteins.