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IMP2 , a nuclear gene controlling the mitochondrial dependence of galactose, maltose and raffinose utilization in Saccharomyces cerevisiae
Author(s) -
Donnini Claudia,
Lodi Tiziana,
Ferrero Iliana,
Puglisi Pier Paolo
Publication year - 1992
Publication title -
yeast
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.923
H-Index - 102
eISSN - 1097-0061
pISSN - 0749-503X
DOI - 10.1002/yea.320080203
Subject(s) - biology , raffinose , saccharomyces cerevisiae , mutant , maltose , complementation , galactose , phenotype , gene , biochemistry , regulon , mitochondrion , microbiology and biotechnology , genetics , enzyme , sucrose
The IMP2 gene of Saccharomyces cerevisiae is involved in the nucleo‐mitochondrial control of maltose, galactose and raffinose utilization as shown by the inability of imp2 mutants of grow on these carbon sources in respiratory‐deficient conditions or in the presence of ethidium bromide and erythromycin. The negative phenotype cannot be scored in the presence of inhibitors of respiration and oxidative phosphorylation, indicating that the role of the mitochondria in the utilization of the above‐mentioned carbon sources in imp2 mutants is not at the energetical level. Mutantions in the IMP2 gene also confer many phenotypic alterations in respiratory‐sufficient conditions, e.g. leaky phenotype on oxidizable carbon sources, sensitivity to heat shock and sporulation deficiency. The IMP2 gene has been cloned, sequenced and disrupted. The phenotype of null imp2 mutants is indistinguishable from that of the originally isolated mutant.