通过一种含有JmjC域的蛋白质家族进行质子脱甲基化
Yu-ichi Tsukada1, Jia Fang, Hediye Erdjument-Bromage
1Howard Hughes Medical Institute, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7295, USA.
Nature
|December 20, 2005
概括
研究人员发现了JHDM1,这是一种新型蛋白质,可以在lysine 36 (H3-K36) 处从histon H3中积极去除甲基. 这一发现揭示了在真核生物中组织脱甲基化的一种保存机制.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 协同基因组修饰调节染色体动力学和基因转录.
- 基因素甲基化,特别是活性脱甲基化的可逆性以前是未知的.
研究的目的:
- 为了识别能够积极从基因组中去除甲基组的蛋白质.
- 描述组织基因素脱甲基化的机制和保存.
主要方法:
- 生物化学分析和染色学分析被用来净化JHDM1.1.
- 在体内过度表达的研究评估了JHDM1对H3K36me2水平的影响.
- 在Saccharomyces cerevisiae中进行的同类研究证实了保留的脱甲基酶活性.
主要成果:
- 一种新的JmjC域含有蛋白质JHDM1被净化.
- 在Fe (II) 和α-甲酸盐的存在下,JHDM1在lysine 36 (H3-K36) 处特异性地去甲基化基 H3.
- 过度表达JHDM1在体内降低了H3K36me2水平,酵母同类物也表现出类似的活性.
结论:
- 该JmjC域被确定为一种新型的基因组脱甲基酶基因.
- 从酵母到人类的蛋白质脱甲基化机制被发现.
- JHDM1代表了调节基因组甲基化动态的关键酶.
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