title: Posttranslational regulation of repressible acid phosphatase in yeast.
abstract: On the basis of genetic data it has been suggested that repressible acid phosphatase of Saccharomyces cerevisiae is regulated by a control circuit involving operator-repressor mechanisms (Toh-e et al., 1978). We measured no significant difference in the amount of translatable mRNA of repressed and derepressed cells in the reticulocyte in vitro translation system. We find a 25 fold difference in specific enzyme activity in repressed versus derepressed cells whereas the amount of 35S-methionine labelled enzyme protein as measured by antibody precipitation varies only 2-3 fold. This argues for posttranslational regulation of preexisting inactive acid phosphatase. Minor regulatory effects at the transcriptional or translational level cannot be excluded.
mesh_terms: D000135:Acid Phosphatase / Q000096:biosynthesis / Q000235:genetics*; D004790:Enzyme Induction; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D012333:RNA, Messenger; D000135:Acid Phosphatase