大肠杆菌染色体的复制性起源只在半甲基化时与细胞膜结合
G B Ogden1, M J Pratt, M Schaechter
1Department of Molecular Biology and Microbiology Tufts University Health Sciences Campus, Boston, Massachusetts 02111.
Cell
|July 1, 1988
概括
大肠杆菌起源的DNA只在半甲基化时与细胞膜结合,这种状态发生在复制开始后不久. 这一发现为细菌染色体分离提供了新的模型.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 大肠杆菌的复制起源 (oriC) 对于DNA复制的启动至关重要.
- 外膜蛋白涉及到各种细胞过程,包括DNA分离.
研究的目的:
- 为了研究大肠杆菌ORICDNA与细菌外膜之间的相互作用.
- 阐明DNA甲基化在oriC膜结合中的作用及其与染色体分离的潜在联系.
主要方法:
- 准备大肠杆菌外膜部分.
- 使用标记的oriC DNA片段进行DNA结合测试.
- 使用大肠杆菌DNA腺甲基酶识别位 (GATC位) 分析DNA甲基化状态 (半甲基化).
主要成果:
- 观察到oriC DNA与大肠杆菌外膜制剂的高亲和度结合.
- 特定的结合发生在oriC的463bp区域内,富含GATC遗址.
- oriC DNA 与膜的结合取决于半甲基化,仅发生在8-10分钟的复制后启动窗口中,当原始被半甲基化时.
结论:
- 大肠杆菌oriC DNA的半甲基化是其与外膜高亲和度结合的关键因素.
- 在特定的复制后窗口期间这种短暂的结合表明了协调DNA复制与染色体分离的机制.
- 提出了一种对大肠杆菌染色体分离的推测模型,涉及由甲基化状态调节的oriC-膜相互作用.
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