Synthetic Chain Terminators Off-Load Intermediates from a Type I Polyketide Synthase
Synthetic Chain Terminators Off-Load Intermediates from a Type I Polyketide Synthase
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DOI：
10.1002/cbic.200900772
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发表时间：
2010-03-01
期刊：
影响因子：
3.2
通讯作者：
Leadlay, Peter F.
中科院分区：
文献类型：
--
作者：
Tosin, Manuela;Betancor, Lorena;Leadlay, Peter F.
Modular biocatalysis is responsible for the generation of countless bioactive products and its mining remains a major focus for drug discovery purposes. One of the enduring hurdles is the isolation of biosynthetic intermediates in a readily-analysed form. We prepared a series of nonhydrolysable pantetheine and N-acetyl cysteamine mimics of the natural (methyl)malonyl extender units recruited for polyketide formation. Using these analogues as competitive substrates, we were able to trap and off-load diketide and triketide species directly from an in vitro reconstituted type I polyketide synthase, the 6-deoxyerythronolide B synthase 3 (DEBS3). The putative intermediates, which were extracted in organic solvent and characterised by LC-HR-ESI-MS, are the first of their kind and prove that small-molecule chain terminators can be used as convenient probes of the biosynthetic process.
