4'-phosphopantetheine 496-65-1 79956-01-7 Acyl Carrier Protein Bacterial Proteins EC 2.7.8.- EC 6.3.2.- Enzymes Journal Article NM39WU8OFM Pantetheine Peptide Library Peptide Synthases Polyketide Synthases Research Support, Non-U.S. Gov't Transferases (Other Substituted Phosphate Groups) non-ribosomal peptide synthase phosphopantetheinyl transferase