Báo cáo khoa học: Mutational analysis of the C-domain in nonribosomal peptide synthesis
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The initial condensation event in the nonribosomal biosyn-thesisof thepeptideantibioticsgramicidinSandtyrocidineA takes place between a phenylalanine activating racemase GrsA/TycAand the ®rst proline-activatingmodule ofGrsB/ TycB. Recently we established a minimalin vitro model system for NRPS with recombinant His6-tagged GrsA (GrsA Phe-ATE; 127 kDa) and TycB1 (TycB1Pro-CAT; 120 kDa) and demonstrated the catalytic function of the C-domaininTycB1Pro-CAT to form a peptide bond between phenylalanine and proline during diketopiperazine formation (DKP). ...
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