In Vitro Reconstitution of OxyA Enzymatic Activity Clarifies Late Steps in Vancomycin Biosynthesis

Clarissa C. Forneris, Seyma Ozturk, Marcus I. Gibson, Erik J. Sorensen, Mohammad R. Seyedsayamdost

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Studies on the biosynthesis of glycopeptide antibiotics have provided many insights into the strategies that Nature employs to build architecturally strained molecules. A key structural feature of vancomycin, the founding member of this class, is a set of three aromatic cross-links that are introduced via yet unknown mechanisms. Previous reports have identified three cytochrome P450 enzymes involved in this process and demonstrated enzymatic activity for OxyB, which installs the first aromatic cross-link. However, the activities of the remaining two P450 enzymes have not been recapitulated. Herein, we show that OxyA generates the second bis-aryl ether bond in vancomycin and that it exhibits strict substrate specificity toward the chlorinated, OxyB-cross-linked product. No OxyA product is detected with the unchlorinated substrate. Together with previous results, these data suggest that chlorination occurs after OxyB- but before OxyA-catalyzed cross-link formation. Our results have important implications for the chemo-enzymatic synthesis of vancomycin and its analogs.

Original languageEnglish (US)
Pages (from-to)2248-2253
Number of pages6
JournalACS chemical biology
Issue number9
StatePublished - Sep 15 2017

All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Biochemistry


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