MAK10, a glucose-repressible gene necessary for replication of a dsRNA virus of Saccharomyces cerevisiae, has T cell receptor alpha-subunit motifs.
The MAK10 gene is necessary for the propagation of the L-A dsRNA virus of the yeast Saccharomyces cerevisiae. We have isolated MAK10 from selected phage lambda genomic DNA clones that map near MAK10. This gene encodes a 733-amino acid protein with several regions of similarity to T cell receptor alpha-subunit V (variable) regions. We show that MAK10 is essential for optimal growth on nonfermentable carbon sources independent of its effect on L-A. Although loss of L-A by mak10-1 mutants is partially suppressed by loss of the mitochondrial genome, no such suppression of a mak10::URA3 mutation was observed. Using MAK10-lacZ fusions we show that MAK10 is expressed at a very low level and that it is glucose repressed. The highest levels of expression were seen in tup1 and cyc8 mutants, known to be defective in glucose repression. These results suggest that the mitochondrial genome and L-A dsRNA compete for the MAK10 protein.
Lee
Y J
YJ
Section on Genetics of Simple Eukaryotes, National Institute of Diabetes Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892.
Wickner
R B
RB
D000123:Acetyltransferases; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004279:DNA, Viral; D015870:Gene Expression / Q000187:drug effects; D005814:Genes, Viral / Q000187:drug effects; D005947:Glucose / Q000494:pharmacology; D008969:Molecular Sequence Data; D009154:Mutation; D063210:N-Terminal Acetyltransferase B; D012328:RNA Viruses / Q000235:genetics* / Q000502:physiology; D012330:RNA, Double-Stranded / Q000235:genetics; D012367:RNA, Viral / Q000235:genetics; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics*; D012441:Saccharomyces cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid; D014764:Viral Proteins / Q000235:genetics*; D014779:Virus Replication / Q000235:genetics*
D004279:DNA, Viral; C077082:MAK10 protein, S cerevisiae; D012330:RNA, Double-Stranded; D012367:RNA, Viral; D016693:Receptors, Antigen, T-Cell, alpha-beta; D029701:Saccharomyces cerevisiae Proteins; D014764:Viral Proteins; D000123:Acetyltransferases; D063210:N-Terminal Acetyltransferase B; D005947:Glucose