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EMBO J. 2002 Apr 2;21(7):1811-20.

Trm7p catalyses the formation of two 2'-O-methylriboses in yeast tRNA anticodon loop.

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  • 1Centre de Recherche de Biochimie Macromoléculaire du CNRS, 1919 Route de Mende, F-34293 Montpellier cedex 5, France.


The genome of Saccharomyces cerevisiae encodes three close homologues of the Escherichia coli 2'-O-rRNA methyltransferase FtsJ/RrmJ, designated Trm7p, Spb1p and Mrm2p. We present evidence that Trm7p methylates the 2'-O-ribose of nucleotides at positions 32 and 34 of the tRNA anticodon loop, both in vivo and in vitro. In a trm7Delta strain, which is viable but grows slowly, translation is impaired, thus indicating that these tRNA modifications could be important for translation efficiency. We discuss the emergence of a family of three 2'-O-RNA methyltransferases in Eukaryota and one in Prokaryota from a common ancestor. We propose that each eukaryotic enzyme is located in a different cell compartment, in which it would methylate a different RNA that can adopt a very similar secondary structure.

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