Isolation and characterization of maltose non utilizing (mnu) mutants mapping outside the MAL1 locus in Saccharomyces cerevisiae.
The MAL1 locus of Saccharomyces cerevisiae comprises three genes necessary for maltose utilization. They include regulatory, maltose transport and maltase genes designated MAL1R, MAL1T and MAL1S respectively. Using a MAL1 strain transformed with an episomal, multicopy plasmid carrying the MAL2 locus, five recessive and one dominant mutant unable to grow on maltose, but still retaining a functional MAL1 locus were isolated. All the mutants could use glycerol, ethanol, raffinose and sucrose as a sole carbon source; expression of the maltase and maltose permease genes was severely and coordinately reduced. Only the dominant mutant failed to accumulate the MAL1R mRNA.
Vanoni
M
M
Dipartimento Fisiologia e Biochimica Generali, Università degli Studi di Milano, Italy.
Goldenthal
M J
MJ
D015152:Blotting, Northern; D005800:Genes, Fungal; D005838:Genotype; D008320:Maltose / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000378:metabolism; D009004:Monosaccharide Transport Proteins; D009154:Mutation; D012331:RNA, Fungal / Q000235:genetics / Q000302:isolation & purification; D012333:RNA, Messenger / Q000235:genetics / Q000302:isolation & purification; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism; D000520:alpha-Glucosidases / Q000378:metabolism
D026901:Membrane Transport Proteins; D009004:Monosaccharide Transport Proteins; D012331:RNA, Fungal; D012333:RNA, Messenger; D008320:Maltose; C021534:maltose permease; D000520:alpha-Glucosidases