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Volume 272, Number 13, Issue of March 28, 1997 pp. 8165-8171
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

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Functional Analysis of Ribosomal Protein L2 in Yeast Mitochondria

(Received for publication, November 4, 1996, and in revised form, December 23, 1996)

From the Department of Biochemistry and Molecular Biology, Program in Molecular and Cellular Biology, University of Massachusetts, Amherst, Massachusetts 01003

The yeast nuclear gene RML2, identified through genomic sequencing of Saccharomyces cerevisiae chromosome V, was shown to encode a mitochondrial homologue of the bacterial ribosomal protein L2. Immunoblot analysis showed that the mature Rml2p is a 37-kDa polypeptide component of the mitochondrial 54 S large ribosomal subunit. Null mutants of RML2 are respiration-deficient and convert to [rho] or [rho°] cytoplasmic petites, indicating that Rml2p is essential for mitochondrial translation. RML2 is regulated transcriptionally in response to carbon source and the accumulation of Rml2p is dependent on the presence of the 21 S large rRNA. Site-directed mutagenesis showed that a highly conserved 7-amino acid sequence (Val³³⁶ to Asp³⁴²) of Rml2p is essential for function. Substitution of Gln for His-343, the most highly conserved histidine in the L2 protein family, caused cold-sensitive respiratory growth but did not affect the assembly of 54 S ribosomal subunits. Mitochondrial protein synthesis was normal in the His³⁴³ to Gln (H343Q) mutant grown at the permissive temperature (30 °C) and was severely impaired after growth at the nonpermissive temperature (18 °C). His³⁴³ corresponds to His²²⁹ in Escherichia coli L2, which has been implicated in a direct involvement in peptidyl transferase activity. The conditional phenotype of the H343Q mutant indicates that His³⁴³ is not essential for peptidyl transferase activity in yeast mitochondria.

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