SEC65基因产品是酵母信号识别粒子的子单元,其完整性需要其完整性
B C Hann1, C J Stirling, P Walter
1Department of Biochemistry and Biophysics, University of California, Medical School, San Francisco 94143-0448.
Nature
|April 9, 1992
概括
SEC65基因产物SEC65p被确定为Saccharomyces cerevisiae信号识别粒子 (SRP) 的一个关键子单元. 它确保了SRP54p的稳定结合,这对于蛋白质转移到内质网膜至关重要.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 蛋白质向细胞内膜网 (ER) 对于细胞功能至关重要.
- 信号识别粒子 (SRP) 在哺乳动物细胞中调解了这一过程.
- 酵母SRP的特征不完全,只确定了SRP54p和scR1.
研究的目的:
- 为了识别和描述Saccharomyces cerevisiae SRP.的新型子单元.
- 阐明 SEC65 基因产物在酵母 SRP 组合和功能中的功能.
- 研究SEC65p和SRP54p在蛋白质转位中的关系.
主要方法:
- 对sec65-1突变酵母菌株的遗传分析.
- 在SEC65基因的DNA测序.
- 酵母SRP子单位的生物化学表征.
- 在野生类型和突变酵母中分析蛋白质转位测试.
主要成果:
- 证实SEC65p是S. cerevisiae SRP的一个子单元.
- SEC65p对于SRP54p与SRP复合物的稳定结合至关重要.
- 在sec65-1突变体中,SRP54p的过度表达挽救了生长和蛋白质转位缺陷.
- 这种SEC65基因产物与哺乳动物SRP19亚单元有功能关系.
结论:
- 在酵母SRP的结构完整性和功能中,SEC65p起着至关重要的作用.
- SEC65p和SRP54p之间的相互作用对于有效的蛋白质向ER至关重要.
- 了解酵母SRP组装提供了对细胞中保存的蛋白质准机制的洞察.
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