title: Inactivation of maltose permease and maltase in sporulating Saccharomyces cerevisiae.
abstract: Maltose transport and maltase activities were inactivated during sporulation of a MAL constitutive yeast strain harboring different MAL loci. Both activities were reduced to almost zero after 5 h of incubation in sporulation medium. The inactivation of maltase and maltose permease seems to be related to optimal sporulation conditions such as a suitable supply of oxygen and cell concentration in the sporulating cultures, and occurs in the fully derepressed conditions of incubation in the sporulation acetate medium. The inactivation of maltase and maltose permease under sporulation conditions in MAL constitutive strains suggests an alternative mechanism for the regulation of the MAL gene expression during the sporulation process.
authors.affiliation: Departamento de Bioquímica, Universidade Federal do Rio de Janeiro, Brasil.
authors.forename: J C
authors.initials: JC
authors.lastname: Ferreira
authors.forename: A D
authors.initials: AD
authors.lastname: Panek
authors.forename: P S
authors.initials: PS
authors.lastname: de Araujo
mesh_terms: D003470:Culture Media; D004789:Enzyme Activation; D026901:Membrane Transport Proteins / Q000378:metabolism*; D009004:Monosaccharide Transport Proteins; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000502:physiology*; D013172:Spores, Fungal / Q000502:physiology; D000520:alpha-Glucosidases / Q000378:metabolism*
chemical_list: D003470:Culture Media; D026901:Membrane Transport Proteins; D009004:Monosaccharide Transport Proteins; C021534:maltose permease; D000520:alpha-Glucosidases