在Saccharomyces cerevisiae的遗传密码中添加具有新型反应性的氨基酸
Alexander Deiters1, T Ashton Cropp, Mridul Mukherji
1Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
Journal of the American Chemical Society
|September 25, 2003
概括
研究人员设计了大肠杆菌tRNA合成酶以特定地将非自然氨基酸纳入蛋白质. 这使得正交生物结合能够用新型的功能组标记生物样本.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 合成生物学 合成生物学
背景情况:
- 特定位置的蛋白质标签对于理解生物过程至关重要.
- 需要正角化学来引入功能组,而不会干扰本地生物功能.
- 遗传选择为进化蛋白质功能提供了一种强大的方法.
研究的目的:
- 开发一种用于工程氨基酸-tRNA合成酶的新型遗传选择.
- 为了创建能够将非自然氨基酸纳入蛋白质的tRNA合成酶对.
- 为了证明这些对对于特定位点的蛋白质修饰的有用性.
主要方法:
- 在大肠杆菌中进行新型遗传选择,进化出tRNA合成酶突变.
- 进化合成酶的特征,用于选择性充电珀抑制剂tRNA.
- 将p- ((propargyloxy) phenylalanine和p-azidophenylalanine纳入蛋白质中的方法.
- 对蛋白质生物结合的生物对等 [3 + 2] 循环添加的证明.
主要成果:
- 鉴定了E.大肠杆菌铁-tRNA合成酶突变体,可以选择性地充电珀抑制器tRNA.
- 成功地将p- ((propargyloxy) phenylalanine和p-azidophenylalanine纳入了酵母中的蛋白质.
- 通过 [3 + 2] 循环添加,证明了标记蛋白与小有机分子的有效生物结合.
- 循环添加反应是温和的,适合生物样本.
结论:
- 设计的tRNA合成酶对为特定位点的蛋白质标记提供了一个多功能平台.
- 开发的方法允许引入与原生生物化学相对应的函数组.
- 这种方法促进了生物系统中蛋白质的修改和研究.
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