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- W2046213778 abstract "A structurally diverse group of bioactive peptides is synthesized by peptide synthetases which act as templates for a growing peptide chain, attached to the enzyme via a thioester bond. The protein templates are composed of distinctive substrate-activating modules, whose order dictates the primary structure of the corresponding peptide product. Each module contains defined domains that catalyze adenylation, thioester and peptide bond formation, as well as substrate modifications. To show that a putative thiolation domain (PCP) is involved in covalent binding and transfer of amino acyl residues during non-ribosomal peptide synthesis, we have cloned and biochemically characterized that region of tyrocidine synthetase 1, TycA.The 327-bp gene fragment encoding PCP was cloned using its homology to the genes for the acyl carrier proteins of fatty acid and polyketide biosynthesis. The protein was expressed as a His6 fusion protein, and purified in a single step by affinity chromatography. Incorporation of beta-[3H]alanine, a precursor of coenzyme A, demonstrated the modification of PCP with the cofactor 4'-phosphopantetheine. When an adenylation domain is present to supply the amino adenylate moiety, PCP can be acylated in vitro.PCP can bind covalently to the cofactor phosphopantetheine and can subsequently be acylated, strongly supporting the multiple carrier model of non-ribosomal peptide synthesis. The adenylation and thiolation domains can each act as independent multifunctional enzymes, further confirming the modular structure of peptide synthases, and can also perform sequential steps in trans, as do multienzyme complexes." @default.
- W2046213778 created "2016-06-24" @default.
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- W2046213778 creator A5051217891 @default.
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- W2046213778 date "1996-01-01" @default.
- W2046213778 modified "2023-10-17" @default.
- W2046213778 title "Biochemical characterization of peptidyl carrier protein (PCP), the thiolation domain of multifunctional peptide synthetases" @default.
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- W2046213778 doi "https://doi.org/10.1016/s1074-5521(96)90180-5" @default.
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