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J. Biol. Chem., Vol. 276, Issue 19, 15861-15867, May 11, 2001
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From the Mitochondrial ribosomal proteins were studied
best in yeast, where the small subunit was shown to contain about 35 proteins. Yet, genetic and biochemical studies identified only 14 proteins, half of which were predictable by sequence homology with
prokaryotic ribosomal components of the small subunit. Using a recently
described affinity purification technique and tagged versions of yeast
Ykl155c and Mrp1, we isolated this mitochondrial ribosomal subunit and identified a total of 20 proteins, of which 12 are new. For a subset of
the newly described ribosomal proteins, we showed that they are
localized in mitochondria and are required for the respiratory competency of the yeast cells. This brings to 26 the total number of
proteins described as components of the mitochondrial small ribosomal
subunit. Remarkably, almost half of the previously and newly identified
mitochondrial ribosomal components showed no similarity to any known
ribosomal protein. Homologues could be found, however, in predicted
protein sequences from Schizosaccharomyces pombe. In more
distant species, putative homologues were detected for Ykl155c, which
shares conserved motifs with uncharacterized proteins of higher
eukaryotes including humans. Another newly identified ribosomal
protein, Ygl129c, was previously shown to be a member of the DAP-3
family of mitochondrial apoptosis mediators.
Identification of 12 New Yeast Mitochondrial Ribosomal Proteins
Including 6 That Have No Prokaryotic Homologues*
§,
,
,
,

Génétique des Interactions
Macromoléculaires, CNRS (URA2171), ¶ Génétique
Moléculaire des Levures, CNRS (URA2171), and ** Chimie Structurale
des Macromolécules, CNRS (URA2185), Institut Pasteur, 25-28 Rue
du Dr. Roux, 75724 Paris Cedex 15, France
*
This work was supported by grants from Groupe d'Interet
Publique-Aventis, CNRS, and Ministere de l'Education Nationale
(France).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Supported by a grant (EUROFAN2 Bio4-CT97-2294) from the
European Economic Community.

To whom correspondence should be addressed. Tel.: 33 140 613 205; Fax: 33 145 688 790; E-mail: jacquier@pasteur.fr.
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