概括
细菌菌的KEX2基因编码了一个关键的内酶. 这种酶对于处理像α因子这样的分泌是必不可少的,而它在kex2突变体中缺少导致的产生和分泌有缺陷.
科学领域:
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
- 蛋白质加工是一种蛋白质加工.
背景情况:
- 糖菌 (Saccharomyces cerevisiae kex2) 突变体在产生分泌的过程中表现出缺陷,包括杀伤性毒素和α因子.
- 这些是从更大的前体多中衍生出来的,这些多经过蛋白质分解裂变.
- 在kex2突变体中,α-因子前体被不当处理并以高糖基化状态分泌.
研究的目的:
- 为了确定负责kex2突变体中蛋白质分解处理缺陷的基因.
- 描述与KEX2基因相关的酶活性.
- 阐明KEX2在酵母的成熟和分泌中的作用.
主要方法:
- 通过补充kex2突变表型来隔离野生类型KEX2基因.
- 基因交叉验证突变和表型的共同分离.
- 在体外酶分析以检测内酶活性.
- 在体内对前阿尔法因子加工和糖化酶的分析.
主要成果:
- kex2突变体缺乏一种特定的 Zn++ 敏感的膜相关内酶活性.
- 克隆的KEX2基因在体外恢复了内酶的活性.
- 在体内,KEX2基因的表达纠正了前-α因子的蛋白质分解处理和糖化缺陷.
- 基因剂量效应表明,KEX2是这种内酶的结构基因.
结论:
- KEX2基因编码了一种与膜相关的内酶,这种酶对于S. cerevisiae中分泌的的正确处理至关重要.
- 这种内酶活性对像α-因子这样的的生物功能至关重要.
- 基因产物KEX2在酵母的分泌途径中起着至关重要的作用.
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