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 serves as a prosthetic group for various acyl carrier proteins including fatty acid synthases, polyketide synthases, peptidyl carrier proteins, and nonribosomal peptide synthetases, as well as aryl carrier proteins.