IRA ] , an Inhibitory Regulator of the RAS-Cyclic AMP Pathway in Saccharomyces cerevisiae

IRA ] , an Inhibitory Regulator of the RAS-Cyclic AMP Pathway in Saccharomyces cerevisiae
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IRA ],酿酒酵母 RAS-环磷酸腺苷途径的抑制性调节剂

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通讯作者:
A. Toh
A. Toh
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作者:
Kazuma Tanaka;Kunihiro Matsumoto;A. Toh

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基因IRA[(以前称为PPI)I)的突变最初被描述为磷酸蛋白磷酸酶的缺乏。IRA基因已经被克隆并测序。发现一个大的开放阅读框(8,817个碱基对),可编码2,938个氨基酸的蛋白质。Northern (RNA)印迹分析检测到约10千碱基的信息,核酸酶Si保护表明mRNA起点位于推定的启动子ATG密码子上游97和98个碱基对。IRA)基因的破坏导致了对氮饥饿和热休克的敏感性。被破坏的IRA基因纯合的二倍体产孢不足。IRA)基因的破坏抑制了cdc25突变的致死率,但没有抑制rasl ras2或cyri突变的致死率。在IRA基因的突变体中,磷酸蛋白磷酸酶缺乏是不可重复的。此外,该病毒突变体表现出环AMP水平的增加。我们的研究结果表明,IRA)蛋白抑制RAS蛋白的功能,与CDC25蛋白在酿酒酵母RAS-环AMP途径中的功能相拮抗。
A mutation in the gene IRA] (formerly called PPI)I) was originally characterized as a deficiency of a phosphoprotein phosphatase. The IRA] gene has been cloned and sequenced. A large open reading frame (8,817 base pairs) which can encode a protein of 2,938 amino acids was found. Northern (RNA) blot analysis detected a message of about 10 kilobases, and nuclease Si protection demonstrated mRNA start points at 97 and 98 base pairs upstream from the putative initiator ATG codon. Disruption of the IRA) gene resulted in sensitivity to nitrogen starvation and heat shock. Diploids homozygous for the disrupted IRA] gene were deficient in sporulation. Disruption of the IRA) gene suppressed the lethality of the cdc25 mutation but did not suppress the lethality of either the rasl ras2 or the cyri mutations. Deficiency of the phosphoprotein phosphatase was not reproducible in the disruption mutant of the IRA) gene. Moreover, the iral mutant showed an increased level of cyclic AMP. Our results suggest that the IRA) protein inhibits the function of the RAS proteins in a fashion antagonistic to the function of the CDC25 protein in the RAS-cyclic AMP pathway in Saccharomyces cerevisiae.
通过整合 DNA 转化对酵母肌动蛋白基因进行致命破坏。
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发表时间: 1982
期刊: Science (New York, N.Y.)
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