在选择拼接地点时,是否扫描脊椎动物的前体?
M Niwa1, C C MacDonald, S M Berget
1Verna and Marrs McClean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030.
Nature
|November 19, 1992
概括
脊椎动物的拼接可能涉及到一个外子扫描机制. 插入一个5'拼接部位在一个3'外因子减少的多基和因子结合,支持这个模型.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 扫描机制是脊椎动物拼接协调的模型.
- 以前的模型预测了内部极性,但缺乏证据.
- 一个替代假设表明外子,而不是内子,是识别的单位.
研究的目的:
- 为了研究用于结合部位选择的外扫描机制.
- 为了确定3'-终端外子内的5'连接位点识别是否会影响多化.
- 探索拼接和多化因子之间的相互作用.
主要方法:
- 在体外和体内测试以检测拼接部位识别.
- 测量聚亚脱化速率的方法.
- 紫外线交叉连接以评估聚亚脱化因子的结合.
主要成果:
- 在体外和体内,在3'-终端外子内识别了一个5'拼接位.
- 这种认识导致了多化率的下降.
- 当拼接位在300个核酸以内时,聚基化因子的紫外线交联减少.
结论:
- 这些发现支持在脊椎动物中选择拼接部位的外扫描机制.
- 剪接和多化因子在3'-终端外子识别过程中相互作用.
- 5'和3'拼接位的距离影响了这些相互作用.
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