301. RNA recognition mechanism of eukaryote tRNA (m7G46) methyltransferase (Trm8-Trm82 complex).
- Author
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Matsumoto K, Toyooka T, Tomikawa C, Ochi A, Takano Y, Takayanagi N, Endo Y, and Hori H
- Subjects
- Binding Sites, Nucleic Acid Conformation, Saccharomyces cerevisiae enzymology, RNA, Transfer, Phe chemistry, Saccharomyces cerevisiae Proteins chemistry, tRNA Methyltransferases chemistry
- Abstract
Yeast tRNA (m(7)G46) methyltransferase contains two protein subunits (Trm8 and Trm82). To address the RNA recognition mechanism of the Trm8-Trm82 complex, we investigated methyl acceptance activities of eight truncated yeast tRNA(Phe) transcripts. Both the D-stem and T-stem structures were required for efficient methyl-transfer. To clarify the role of the D-stem structure, we tested four mutant transcripts, in which tertiary base pairs were disrupted. The tertiary base pairs were important but not essential for the methyl-transfer to yeast tRNA(Phe) transcript, suggesting that these base pairs support the induced fit of the G46 base into the catalytic pocket.
- Published
- 2007
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