对于过氧体生物发生所必不可少的Pas2蛋白与无素结合酶有关
1Institut für Physiologische Chemie, Ruhr-Universität Bochum, Abteilung für Zellbiochemie, Germany.
Nature
|September 3, 1992
概括
研究人员在酵母中确定了PAS2基因,揭示了一种新的泛素结合酶,该酶对过氧体形成至关重要. 这一发现突出了泛素结合路径.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
背景情况:
- 在Saccharomyces cerevisiae中,PAS基因对于过氧体生物发生和增殖至关重要.
- PAS1和PAS3是此前在这条途径中表征的基因.
研究的目的:
- 为了克隆和测序PAS2基因.
- 阐明PAS2基因及其蛋白质产物的功能.
- 为了研究在有机细胞形成中的无素结合途径的作用.
主要方法:
- 基因克隆和PAS2的测序.
- 在Pas2中保存的氨酸残留物的位点定向突变发生.
- 突变酵母菌株的补充分析.
主要成果:
- 克隆和测序了PAS2基因,发现它编码了一种新的全域联酶 (UBC) 酶 (UBC10).
- 帕斯2是第一个被确定与过氧体相关的UBC蛋白.
- 关键的氨酸残留物的突变发生使Pas2变得非功能,证实了其UBC酶活性.
- 有证据表明,在有机体生物发生过程中,无素对的作用至关重要.
结论:
- 该PAS2基因编码UBC10,这是一个与氧体相关的泛素结合酶.
- 乌比奎-结合途径对于酵母中的过氧体生物发生是必不可少的.
- 这项研究将蛋白质无处不在与有机细胞形成联系起来.
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