一种纯化的Drosophila主体蛋白抑制了体外转录
1Howard Hughes Medical Institute, Department of Biochemistry, University of California, Berkeley 94720.
Cell
|August 11, 1989
概括
均跳过 (eve) 蛋白直接抑制基因转录,作为转录因子. 这一在体外和细胞培养中证明的发现,阐明了家庭主体蛋白如何调节发育.
科学领域:
- 发育生物学 发展生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 偶跳过 (eve) 基因编码了一个已知抑制Ultrabithorax (Ubx) 等关键发育基因的宿主蛋白.
- 家庭主体蛋白质是胚胎发育的关键调节者,但它们精确的转录调节机制仍在被阐明.
研究的目的:
- 通过生物化学证明,纯化的偶跳过 (eve) 蛋白质可以直接抑制转录.
- 为了研究DNA结合的要求和细胞环境,以实现经过介导的转录抑制.
主要方法:
- 在体外转录试验中,使用纯化的偶跳过 (eve) 蛋白和Ultrabithorax (Ubx) 促进剂进行了转录试验.
- 在Drosophila组织培养细胞中进行记者基因测试,以评估eve对Ubx促进体活性的影响.
- 对DNA结合部位依赖性和对转录抑制的导向效应的分析.
主要成果:
- 纯化均跳过 (eve) 蛋白直接抑制了从Ultrabithorax (Ubx) 促进体的转录,以依赖于DNA结合位点的方式.
- 抑制发生不论DNA结合部位相对于RNA起始部位或其方向的位置.
- 均跳过 (eve) 也抑制了Drosophila组织培养细胞中的Ubx促进体表达,证实了其在细胞环境中的作用.
结论:
- 均跳过 (eve) 蛋白质作为直接转录抑制剂,独立于激活体结合的竞争性抑制.
- eve可能会干扰与促进子结合的其他蛋白质的功能,为发育基因调节提供一种新的机制.
- 这项研究提供了生物化学证据,证明多索菲拉家庭主体蛋白质作为转录因子来控制发育过程.
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