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Int. J. Mol. Sci. 2015, 16(5), 9354-9367;

A Moonlighting Human Protein Is Involved in Mitochondrial Import of tRNA

Department of Molecular and Cellular Genetics, UMR 7156 Génétique Moléculaire, Génomique, Microbiologie (GMGM), CNRS—Université de Strasbourg, 67084 Strasbourg, France
Department of Molecular Biology, Biology Faculty of Moscow State University, 119992 Moscow, Russia
These authors contributed equally to this work.
Present address: Genome Institute of Singapore, #02-01 Genome, Singapore 138672.
Author to whom correspondence should be addressed.
Academic Editor: Michael Ibba
Received: 28 January 2015 / Revised: 2 April 2015 / Accepted: 15 April 2015 / Published: 24 April 2015
(This article belongs to the Special Issue Functions of Transfer RNAs)
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In yeast Saccharomyces cerevisiae, ~3% of the lysine transfer RNA acceptor 1 (tRK1) pool is imported into mitochondria while the second isoacceptor, tRK2, fully remains in the cytosol. The mitochondrial function of tRK1 is suggested to boost mitochondrial translation under stress conditions. Strikingly, yeast tRK1 can also be imported into human mitochondria in vivo, and can thus be potentially used as a vector to address RNAs with therapeutic anti-replicative capacity into mitochondria of sick cells. Better understanding of the targeting mechanism in yeast and human is thus critical. Mitochondrial import of tRK1 in yeast proceeds first through a drastic conformational rearrangement of tRK1 induced by enolase 2, which carries this freight to the mitochondrial pre-lysyl-tRNA synthetase (preMSK). The latter may cross the mitochondrial membranes to reach the matrix where imported tRK1 could be used by the mitochondrial translation apparatus. This work focuses on the characterization of the complex that tRK1 forms with human enolases and their role on the interaction between tRK1 and human pre-lysyl-tRNA synthetase (preKARS2). View Full-Text
Keywords: human mitochondria; tRNA targeting; enolase human mitochondria; tRNA targeting; enolase

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Baleva, M.; Gowher, A.; Kamenski, P.; Tarassov, I.; Entelis, N.; Masquida, B. A Moonlighting Human Protein Is Involved in Mitochondrial Import of tRNA. Int. J. Mol. Sci. 2015, 16, 9354-9367.

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