在染色体分离过程中,Set1甲基转移酶反对Ipl1极光激酶的功能
Ke Zhang1, Wenchu Lin, John A Latham
1Program in Genes and Development, Department of Biochemistry and Molecular Biology, M.D. Anderson Cancer Center, University of Texas, Houston, Texas 77030, USA.
Cell
|September 7, 2005
概括
Set1 甲基转移酶通过调节 Ipl1 激酶和 Glc7 酸酶之间的平衡来调节染色体分离. 这涉及Dam1基因基蛋白的甲基化,揭示了Set1.1的新型线粒作用.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 适当的染色体分离依赖于酵母中的Ipl1 Aurora激酶和Glc7酸酶活动之间的平衡.
- 甲基转移酶Set1在线粒分裂中的作用尚未完全理解,已知其在转录和基因素修饰中的功能.
研究的目的:
- 研究Set1甲基转移酶在调节染色体分离中的作用.
- 阐明Set1影响Ipl1-Glc7平衡的机制.
- 为了确定Set1.1的新型线粒功能.
主要方法:
- 基因分析涉及具有SET1,IPL1和GLC7.7突变的酵母菌株.
- 生物化学分析检查蛋白质甲基化和酸化.
- 对Dam1修饰的kinetochore蛋白质的分析.
主要成果:
- 删除SET1抑制了ipl1-2突变酵母细胞中的染色体损失.
- 在SET1和GLC7同时发生的突变是致命的,这表明功能相互作用.
- 设置1调解了在动态蛋白Dam1中保存的lysines的甲基化.
- 达姆1甲基化抑制了邻近的血清蛋白的依赖于Ipl1的酸化,独立于Set1已知的作用.
- 这些发现突显了Set1在线索分裂中的意想不到的功能.
结论:
- Set1甲基转移酶在线粒分裂和染色体分离中起着至关重要的,以前未被认可的作用.
- 氨酸甲基化 (通过Set1) 和氨酸酸化 (通过Ipl1) 之间的对抗作用是控制神经分裂期间蛋白质功能的关键调节机制.
- 这项研究揭示了一种新的线粒细胞调节机制,涉及翻译后修改.
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