Linear aglycones are the substrates for glycosyltransferase DesVII in methymycin biosynthesis: Analysis and implications

Chai Lin Kao, Svetlana A. Borisova, Hak Joong Kim, Hung Wen Liu

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The two essential structural components of macrolide antibiotics are the polyketide aglycone and the appended sugars. The aglycone formation is catalyzed by polyketide synthase (PKS), and glycosylation is catalyzed by an appropriate glycosyltransferase. Although it has been shown that glycosylation occurs after the cyclic aglycone is released from PKS, it is not known whether the acyl carrier protein (ACP)-bound linear polyketide chain can also be processed by the corresponding glycosyltransferase. To explore this possibility, the aglycone, 10-deoxymethynolide, which is the precursor of methymycin and neomethymycin, was chemically synthesized in the linear form as a N-acetylcysteamine (NAC) thioester. Subsequent incubation with TDP-d-desosamine in the presence of the dedicated glycosyltransferase, DesVII, and activator, DesVIII, produces a more polar product whose high-resolution mass is consistent with the anticipated glycosylated product. This study demonstrated for the first time that a macrolide glycosyltransferase can also recognize and process the linear precursor of its macrolactone substrate with a reduced but measurable activity.

Original languageEnglish
Pages (from-to)5606-5607
Number of pages2
JournalJournal of the American Chemical Society
Volume128
Issue number17
DOIs
Publication statusPublished - 2006 May 3

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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