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Transcriptional Regulation of the SMK1Mitogen-Activated Protein Kinase Gene during Meiotic Development inSaccharomyces cerevisiae

机译:酿酒酵母减数分裂发育过程中SMK1丝裂素活化的蛋白激酶基因的转录调控。

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Meiotic development (sporulation) in Saccharomyces cerevisiae is characterized by an ordered pattern of gene expression, with sporulation-specific genes classified as early, middle, mid-late, or late depending on when they are expressed.SMK1 encodes a mitogen-activated protein kinase required for spore morphogenesis that is expressed as a middle sporulation-specific gene. Here, we identify the cis-acting DNA elements that regulate SMK1 transcription and characterize the phenotypes of mutants with altered expression patterns. The SMK1 promoter contains an upstream activating sequence (UASS) that specifically interacts with the transcriptional activator Abf1p. The Abf1p-binding sites from the earlyHOP1 and the middle SMK1 promoters are functionally interchangeable, demonstrating that these elements do not play a direct role in their differential transcriptional timing. Timing of SMK1 expression is determined by anothercis-acting DNA sequence termed MSE (for middle sporulation element). The MSE is required not only for activation ofSMK1 transcription during middle sporulation but also for its repression during vegetative growth and early meiosis. In addition, the SMK1 MSE can repress vegetative expression in the context of the HOP1 promoter and convert HOP1from an early to a middle gene. SMK1 function is not contingent on its tight transcriptional regulation as a middle sporulation-specific gene. However, promoter mutants with different quantitative defects in SMK1 transcript levels during middle sporulation show distinct sporulation phenotypes.
机译:酿酒酵母的减数分裂发育(孢子形成)以基因表达的有序模式为特征,孢子特异性基因根据表达的时间分为早期,中期,中晚期或晚期。 em> SMK1 编码一种孢子形态发生所需的促分裂原活化蛋白激酶,表达为中间孢子形成特异性基因。在这里,我们确定了调控 SMK1 转录的顺式作用DNA元件,并表征了表达模式改变的突变体的表型。 SMK1 启动子包含一个上游激活序列(UAS S ),该序列与转录激活因子Abf1p发生特异性相互作用。早期 HOP1 和中间 SMK1 启动子的Abf1p结合位点在功能上是可互换的,表明这些元件在其差异转录时机中不发挥直接作用。 SMK1 表达的时间由另一个称为“ mSE”的顺式作用DNA序列(称为中子孢子元件)确定。 MSE不仅需要在中孢子形成过程中激活 SMK1 转录,而且还需要在营养生长和减数分裂早期对其进行抑制。此外, SMK1 MSE可以在 HOP1 启动子的背景下抑制营养表达,并将 HOP1 从早期基因转化为中间基因。 SMK1 功能并非依赖于其作为中间孢子形成特异性基因的紧密转录调控。但是,在中等孢子形成过程中, SMK1 转录水平具有不同定量缺陷的启动子突变体表现出不同的孢子表现型。

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