Molecular cloning and analysis of the nuclear gene MRP-L6 coding for a putative mitochondrial ribosomal protein from Saccharomyces cerevisiae.

Abstract:

:The Saccharomyces cerevisiae nuclear gene MRP-L6 was cloned by complementation of the respiratory-deficient mutant pet-ts 2523 with a library of wild-type yeast genomic DNA. The isolated gene was part of a 3.8-kb sequenced DNA fragment containing, in addition to MRP-L6, two unassigned reading frames, ORF1 and ORF2. MRP-L6 codes for a basic protein of 205 amino acids and a molecular mass of 22.8 kDa. The protein exhibits significant sequence similarity to the ribosomal protein L6 of bacteria and chloroplasts. Unlike the corresponding bacterial proteins, however, the MRP-L6 protein (MRP-L6p) contains at its N-terminus a 16 amino-acid leader sequence exhibiting the known characteristics of mitochondrial import signals. Disruption of MRP-L6 leads to the phenotype of a mitochondrial translation-defective, rho-negative yeast mutant. The results are consistent with MRP-L6p representing an essential component of yeast mitochondrial ribosomes. Expression of MRP-L6 was examined, under conditions of glucose repression and derepression, in wild-type cells and in a series of catabolite repression-defective yeast mutants. In most cases, a distinct though small influence of the carbon source on the expression of an MRP-L6/lacZ reported construct was observed.

journal_name

Curr Genet

journal_title

Current genetics

authors

Harrer R,Schwank S,Schüller HJ,Schweizer E

doi

10.1007/BF00324677

subject

Has Abstract

pub_date

1993-07-01 00:00:00

pages

136-40

issue

1-2

eissn

0172-8083

issn

1432-0983

journal_volume

24

pub_type

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