Domain Organization and Active Site Architecture of a Polyketide Synthase C-methyltransferase

Meredith A. Skiba, Andrew P. Sikkema, William D. Fiers, William H. Gerwick, David H. Sherman, Courtney C. Aldrich, Janet L. Smith

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Polyketide metabolites produced by modular type I polyketide synthases (PKS) acquire their chemical diversity through the variety of catalytic domains within modules of the pathway. Methyltransferases are among the least characterized of the catalytic domains common to PKS systems. We determined the domain boundaries and characterized the activity of a PKS C-methyltransferase (C-MT) from the curacin A biosynthetic pathway. The C-MT catalyzes S-adenosylmethionine-dependent methyl transfer to the α-position of β-ketoacyl substrates linked to acyl carrier protein (ACP) or a small-molecule analog but does not act on β-hydroxyacyl substrates or malonyl-ACP. Key catalytic residues conserved in both bacterial and fungal PKS C-MTs were identified in a 2 Å crystal structure and validated biochemically. Analysis of the structure and the sequences bordering the C-MT provides insight into the positioning of this domain within complete PKS modules.

Original languageEnglish (US)
Pages (from-to)3319-3327
Number of pages9
JournalACS Chemical Biology
Volume11
Issue number12
DOIs
StatePublished - Dec 16 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

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