与伪基因相对应的分化蛋白序列的物理和进化能量景观
Hana Jaafari1,2,3, Carlos Bueno1, Nicholas P Schafer1
1Center for Theoretical Biophysics, Rice University, Houston, TX 77005.
概括
人类伪基因,一旦非功能,可能保留折叠潜力. 突变可以破坏蛋白质折叠,但有时会稳定它,改变原始生物活动.
科学领域:
- 分子生物学分子生物学
- 进化生物学 进化生物学
- 生物物理学的生物物理.
背景情况:
- 伪基因是失去了编码能力的非功能基因残留物.
- 尽管失去了功能,但一些伪基因可能保留了结构完整性.
- 了解伪基因进化提供了对基因丢失和潜在的重新激活的见解.
研究的目的:
- 为了研究人类伪基因序列的物理折叠景观.
- 使用直接合分析 (DCA) 分析母蛋白家族的进化能量格局.
- 了解伪基因的突变如何影响蛋白质折叠和生物活动.
主要方法:
- 在物理折叠景观中使用关联记忆,水介导,结构和能量模型 (AMBER).
- 采用直接合分析 (DCA) 来研究进化的能源景观.
- 分析了特定的伪基因:环林A,Profilin-1和小型乌比奎丁类修饰剂2蛋白.
主要成果:
- 伪基因突变通常会破坏稳定残留物相互作用,阻碍折叠.
- 在某些情况下,功能约束的消除矛盾地减少了能量丧,稳定了折叠.
- 伪基因中的稳定突变通常会改变它们以前的生物活性.
结论:
- 伪基序列可以与其功能性祖先相比,具有改变的折叠景观.
- 稳定伪基因折叠的突变可能发生在对祖先蛋白质功能至关重要的区域.
- 这表明,假基因进化中的折叠稳定性和生物活性之间存在权衡.
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