Mechanistic Studies of the Radical S- Adenosyl- l -methionine Enzyme 4-Demethylwyosine Synthase Reveal the Site of Hydrogen Atom Abstraction

Anthony P. Young, Vahe Bandarian

Research output: Contribution to journalArticle

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Abstract

TYW1 catalyzes the formation of 4-demethylwyosine via the condensation of N-methylguanosine (m<sup>1</sup>G) with carbons 2 and 3 of pyruvate. In this study, labeled transfer ribonucleic acid (tRNA) and pyruvate were utilized to determine the site of hydrogen atom abstraction and regiochemistry of the pyruvate addition. tRNA containing a <sup>2</sup>H-labeled m<sup>1</sup>G methyl group was used to identify the methyl group of m<sup>1</sup>G as the site of hydrogen atom abstraction by 5′-deoxyadenosyl radical. [2-<sup>13</sup>C<inf>1</inf>-3,3,3-<sup>2</sup>H<inf>3</inf>]Pyruvate was used to demonstrate retention of all the pyruvate protons, indicating that C2 of pyruvate forms the bridging carbon of the imidazoline ring and C3 the methyl.

Original languageEnglish (US)
Pages (from-to)3569-3572
Number of pages4
JournalBiochemistry
Volume54
Issue number23
DOIs
Publication statusPublished - Jun 16 2015

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ASJC Scopus subject areas

  • Biochemistry

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