限制酶家族之间的复杂DNA识别域的保护
G M Cowan1, A A Gann, N E Murray
1Department of Molecular Biology, University of Edinburgh, Scotland.
Cell
|January 13, 1989
概括
这就是S多.
科学领域:
- 分子生物学分子生物学
- 酶学 是一种酶学.
- 遗传学 是一个遗传学.
背景情况:
- 多子单元型I限制酶利用S多来进行序列特定的DNA识别.
- 两个酶家族,K和A,可以识别多种多重的DNA标.
- 在K家族中的S多体表现出对目标识别至关重要的可变序列区域.
研究的目的:
- 阐明S多的N端域在DNA序列识别中的作用.
- 确定由I型限制酶EcoE识别的特定DNA序列.
- 为了比较不同酶家族的S基因的氨基酸和核酸序列.
主要方法:
- 来自EcoA和EcoE的S基因的序列分析.
- 预测的氨基酸序列与K家族成员的比较.
- 确定EcoE的目标DNA序列.
主要成果:
- K家族S多的N端150氨基酸指定识别一个双重目标组件.
- EcoE可以识别DNA序列5'GAG(N7) ATGC.
- 在K和A家族的S多中存在一种识别GAG的保存域,尽管整体序列不相似.
- 在StySB的GAG特异性域 (K家族) 和EcoA和EcoE (A家族) S多的可变氨基区域之间发现了显著的序列一致性 (近50%).
结论:
- 在不同家族的I型限制酶中存在一个共同的GAG识别和甲基化域.
- 尽管总体序列分歧,但DNA识别域的功能性保存是显而易见的.
- 这项研究强调了S多的模块化性质,赋予了序列特异性.
相关概念视频
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