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• W1999245367 abstract "Daptomycin is a branched cyclic nonribosomally assembled acidic lipopeptide, which is the first clinically approved antibiotic of this class. Here we show that the recombinant cyclization domain of the Streptomyces coelicolor calcium-dependent antibiotic (CDA) nonribosomal peptide synthetase (NRPS) is a versatile tool for the chemoenzymatic generation of daptomycin derivatives. Linear CDA undecapeptide thioesters with single exchanges at six daptomycin-specific residues were successfully cyclized by CDA cyclase. Simultaneous incorporation of all six of these residues into the peptide backbone and elongation of the N-terminus of CDA by two residues yielded a daptomycin derivative that lacked only the β-methyl group of l-3-methylglutamate. Bioactivity studies with several substrate analogues revealed a significant role of nonproteinogenic constituents for antibacterial potency. In accordance with acidic lipopeptides, the bioactivity of the chemoenzymatic assembled daptomycin analogue is dependent on the concentration of calcium ions. Single deletions of the four acidic residues in the peptide backbone suggest that only two aspartic acid residues are essential for antimicrobial potency. These two residues are strictly conserved among other nonribosomal acidic lipopeptides and the EF-motif of ribosomally assembled calmodulin. Based on these findings CDA cyclase is a versatile catalyst that can be used to generate novel daptomycin derivatives that are otherwise difficult to obtain by chemical modification of the parental tridecapeptide to improve further its therapeutic activity." @default.
• W1999245367 created "2016-06-24" @default.
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• W1999245367 date "2004-12-01" @default.
• W1999245367 modified "2023-10-14" @default.
• W1999245367 title "Synthesis and Derivatization of Daptomycin: A Chemoenzymatic Route to Acidic Lipopeptide Antibiotics" @default.
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• W1999245367 doi "https://doi.org/10.1021/ja045455t" @default.
• W1999245367 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15612741" @default.
• W1999245367 hasPublicationYear "2004" @default.
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