在罗斯肉瘤病毒的波区域中,对核糖体框架转移的信号
T Jacks1, H D Madhani, F R Masiarz
1Department of Biochemistry and Biophysics, University of California, San Francisco 94143.
Cell
|November 4, 1988
概括
鲁斯肉瘤病毒 (RSV) 的gag-pol蛋白质合成依赖于核糖体框架转移. 这项研究确定了移部位,并揭示了tRNA滑动作为关键机制,独立于结器.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 遗传学 是一个遗传学.
背景情况:
- 鲁斯肉瘤病毒 (RSV) 通过核糖体框架转移表达必要的GAG-POL蛋白质.
- 这个过程涉及翻译阅读框架的转移,以产生功能性酶,用于反向转录和集成.
研究的目的:
- 为了确定RSV基因组中精确的移位点.
- 阐明驱动RSV中的核糖体框架转移的分子机制.
- 研究RNA结构和突变在调节GAG-POL蛋白质合成中的作用.
主要方法:
- 通过基因操纵定位移部位.
- 分析tRNA滑动及其在转移中的作用.
- 在RSV的pol和gag序列的位点定向突变发生.
- 在体外合成测试以评估GAG-POL蛋白质的生产.
- RNA结构分析,包括茎环形成.
主要成果:
- 框架转移部位被定位,该机制被确定为两个相邻的tRNA的单核酸5'滑动.
- 发现结器序列对于位转移是不必要的.
- 影响GAG-POL合成的RSV pol中的突变与形成相邻RNA干循环结构的能力相关.
- 一个最小的147核酸RSVRNA序列,包含移位点和茎环,足以指导移.
结论:
- 在RSV中,核糖体框架转移主要由tRNA在特定位置的滑动介导.
- RNA的二次结构,特别是框架移位点附近的干环,在调节这个过程中起着至关重要的作用.
- 一个短的RNA序列足以赋予框架转移能力,为进一步的遗传研究提供了一个工具.
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