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对于酵母中的基因活性,对Hos2基因脱乙酶的要求

Amy Wang¹, Siavash K Kurdistani, Michael Grunstein

¹Department of Biological Chemistry, UCLA School of Medicine and the Molecular Biology Institute, Boyer Hall, University of California, Los Angeles, CA 90095, USA.

Science (New York, N.Y.)

|November 16, 2002

概括

基因组脱甲基酶Hos2,与其他I类酶不同,通过在转录过程中脱甲基化基因尾部来促进基因激活. Hos2和Set3对于酵母中有效的基因表达是必不可少的.

科学领域:

分子生物学分子生物学
表观遗传学在表观遗传学中,表观遗传学是指表观遗传学.
酵母遗传学酵母遗传学

背景情况:

基因组脱乙酶 (HDACs) 是重要的表观遗传调节剂,I类HDACs如酵母中的Rpd3在历史上与基因抑制有关.
所有I类HDACs在基因调节中的特定作用,特别是在基因激活期间,仍然不完全理解.

研究的目的:

为了研究I类组基因脱乙酶Hos2在Saccharomyces cerevisiae中的基因调节中的功能.
为了确定基因表达过程中Hos2的局部化和酶活性.
阐明Hos2在基因激活的作用及其与Set3等其他因素的相互作用.

主要方法:

染色体免疫沉 (ChIP) 用于确定Hos2的结合部位.
基因组脱乙酶活性测定用于评估Hos2的特定标 (H3和H4氨酸残留物).
分析野生型和突变酵母菌株 (缺乏Hos2或Set3) 的基因表达水平,以评估转录效率.

主要成果:

Hos2与活跃转录的基因的编码区域结合,特别是在基因激活过程中.
Hos2 催化了特定的溶酶在基因素 H3 和 H4 尾部的脱乙基化.
Hos2优先与全基因组高度活跃的基因相关,并且与Set3一起,对于高效的转录至关重要.

结论:

与其他I类基因素脱乙酶的抑制作用相反,Hos2作为基因转录的直接激活剂.
在活跃转录期间,Hos2在基因尾部脱乙烯化中的作用突出了激活基因的新机制.
这些发现确立了Hos2作为促进基因表达的关键参与者,与其压制性I类对应物不同.

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