Identification and cloning of a yeast nuclear gene (CBP1) involved in expression of mitochondrial cytochrome b

C. L. Dieckmann, L. K. Pape, A. Tzagoloff

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Nuclear pet mutants of Saccharomyces cerevisiae deficient in mitochondrial respiration have been studied genetically and biochemically. Seven noncomplementing mutations leading to a deficiency of mitochondrial cytochrome b have been assigned to a single complementation group (group 60). Examination of mitochondrial RNA by blot hybridization on diazobenzyloxy-methyl-paper has revealed that group 60 mutants produce a large number of nobel apocytochrome b transcripts not detected in wild-type yeast. The product of the gene affected in the mutants, therefore, appears to be required either for correct transcription or for processing of apocytochrome b premessenger RNA. The gene has been designated CBP1. A representative mutant from complementation group (N5-26) has been transformed to respiratory competency with a recombinant plasmid pool consisting of random fragments of wild-type yeast nuclear DNA inserted into a vector capable of replicating in yeast and Escherichia coli. The complementation of the N5-26 mutation has been shown for a number of independent transformants to be due to the presence of plasmid DNA. The plasmid pG60/T10 was further characterized to have a nuclear DNA insert of 6.7 kilobase pairs. This plasmid complements the mutations of all group 60 mutants, thus confirming that it contains the CBP1 gene.

Original languageEnglish (US)
Pages (from-to)1805-1809
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number6 I
StatePublished - 1982

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