概括
酵母中的SUC2基因产生两种逆转酶形式,由RNA水平的葡萄糖水平调节. 来自SUC2基因的不同RNA与分泌与细胞内逆转酶生产相关.
科学领域:
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
- 酶学 是一种酶学.
背景情况:
- 在Saccharomyces cerevisiae中的SUC2基因编码了两种不同的逆转酶:一种通过葡萄糖抑制调节的分泌,糖化形式,以及由构成性产生的细胞内非糖化形式.
- 这两种酶形式对于酵母的碳代谢至关重要,特别是在利用糖糖时.
研究的目的:
- 调查SUC2基因编码的两种逆转酶形式的差异合成和调节背后的分子机制.
- 为了确定是否在RNA水平上发生逆转酶合成的葡萄糖调节.
主要方法:
- 在SUC2基因的克隆中.
- 北方斑分析用于检测和量化不同RNA物种.
- 在不同的葡萄糖条件下,对野生类型和突变酵母菌株 (例如,SNF1位点突变) 的基因表达的分析.
主要成果:
- SUC2基因产生了两个不同的RNA (1.8和1.9kb),它们的5'端不同.
- 1.9 kb RNA 与分泌的逆转酶产生相关,并由葡萄糖调节,而 1.8 kb RNA 与细胞内逆转酶相关,并由构成性产生.
- 在SNF1位点的突变损害了分泌的逆转酶的脱压和1.9 kbRNA的产生.
- 一个沉默的SUC2等位基因在正常葡萄糖调节下产生这两种RNA.
结论:
- 酵母酵母中逆转酶合成的葡萄糖调节至少部分是由RNA水平调节的.
- 这两种SUC2RNA来自不同的转录起点,决定了分泌或细胞内逆转酶的合成.
- 提出差异mRNA启动的模型解释了两种逆转酶形式的合成和调节.
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