探索从热力学稳定和动力学被困的次序和能源景观的结构决定因素:ISP1和SbtE
Miriam R Hood1, Susan Marqusee1,2,3
1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720.
bioRxiv : the preprint server for biology
|September 24, 2024
概括
蛋白质初级序列编码动力障碍,影响折叠和展开的动态. 通过比较Bacillus subtilis subtiliase同类物,发现它们在能量环境上具有明显的亲域效应,影响蛋白质的稳定性和灵活性.
科学领域:
- 生物化学和分子生物学
- 蛋白质折叠的动态 蛋白质折叠的动态
- 酶动力学 酶动力学
背景情况:
- 蛋白质初级序列决定了能量格局,包括构造,种群和相互转换动态.
- 了解序列如何编码动力障碍 (展开/重新折叠) 的理解比原生状态编码要少.
- 从 Bacillus subtilis 获得的细胞内亚菌素蛋白酶1 (ISP1) 和亚菌素E (SbtE) 的亚菌酶同类因其独特的细胞作用和前域结构而表现出预期的动态差异.
研究的目的:
- 直接比较ISP1和SbtE的能源景观,有和没有各自的pro-domains.
- 检查成熟蛋白酶的全球和局部能量以及每个前域的特定影响.
- 阐明序列变化如何影响蛋白质结构动力学和动力障碍.
主要方法:
- 蛋白质能量景观的比较分析.
- 全球和地方能源的检查.
- 成熟蛋白酶及其前域变体的稳定性和运动性特征.
主要成果:
- ISP1的前域对成熟蛋白质的能量格局的影响很小.
- 没有它的主域的SbtE被发现是热力学不稳定和动力学被困的.
- 亲域对核心蛋白质的灵活性产生了相反的影响:ISP1的核心变得更加灵活,而SbtE的核心在没有亲域的情况下变得更加刚硬.
结论:
- 亲域在某些蛋白质的稳定性和折叠中发挥着关键作用,比如SbtE.
- 序列的差异,例如ISP1中的唯一插入,可以导致蛋白质能量格局和动态的显著改变.
- 需要进一步进行大规模,高通量研究,以全面了解初级序列和构造动态之间的关系.
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