Enzymatic mechanism of tRNA (m5U54)methyltransferase.
tRNA (m5U54)methyltransferase (RUMT) catalyzes the methylation of uridine 54 of transfer RNA by S-adenosyl-L-methionine. In this report, we present the enzymatic mechanism of RUMT, including the stereochemical course of the methylation reaction, and discuss RUMT-tRNA recognition. As part of its enzymatic mechanism, we postulate that RUMT catalyzes the disruption of RNA-RNA contacts. We also show that many nucleotide substitutions can be made in the T-loop of tRNA without affecting RUMT binding, indicating that the recognition of the T-loop by RUMT is not stringent.
Kealey
J T
JT
Department of Pharmaceutical Chemistry, University of California, San Francisco 94143-0448, USA.
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Santi
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DV
D000595:Amino Acid Sequence; D001483:Base Sequence; D008969:Molecular Sequence Data; D012359:tRNA Methyltransferases / Q000737:chemistry / Q000378:metabolism*
D012359:tRNA Methyltransferases; C022769:tRNA(uracil-5)-methyltransferase