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- W1864686031 abstract "During meiosis and spore formulation in Saccharomyces cerevisiae, changes that occur in a/alpha diploids, but not in isogenic nonsporulating a/a diploids, have been detected in cellular polypeptides. These were found by the technique of prelabeling growing cells with 35SO4(2-) and suspending them in sulfur-free sporulation medium. Under the conditions used, about 400 polypeptides were detected by two-dimensional gel electrophoresis, and 45 were altered during sporulation; of these, 21 changes were specific to a/alpha strains. These alterations were mainly due to the appearance of new polypeptides or to marked increases in the concentrations of a few polypeptides produced during vegetative growth. They could have been due either to modifications of existing polypeptides present in growing cells or to de novo synthesis of new gene products. They occurred at characteristic times during sporulation; whereas the majority of changes took place early (within the first 6 h in sporulation conditions), there were several changes characterizing the later stages of sporulation. Ten of the 35SO4(2-)-labeled polypeptides were also labeled with 32P in the presence of [32P]orthophosphate; of these, three were previously found to be sporulation specific. One of these was phosphorylated at all stages of sporulation and was labeled when [32P]orthophosphate was added either during growth of the culture of 1 h after transfer to sporulation medium. Another was labeled in the same way by adding 32P at either time, so that by 7 h in sporulation medium it was phosphorylated, but was dephosphorylated by 24 h. The third sporulation-specific peptide was labeled in extracts prepared at 7 h in sporulation medium (but not at 24 h) when [32P]-orthophosphate was added during presporulation growth, but not when [32P]-orthophosphate was added 1 h after transfer of the culture to sporulation medium. This polypeptide appeared early during sporulation; it is probably phosphorylated as it appears and is dephosphorylated at some time between 7 h and 24 h of sporulation." @default.
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- W1864686031 date "1981-10-01" @default.
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- W1864686031 title "Nature and timing of some sporulation-specific protein changes in Saccharomyces cerevisiae." @default.
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- W1864686031 doi "https://doi.org/10.1128/mcb.1.10.910" @default.
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