折叠的阿尔法螺旋形假定新蛋白质来自Apilactobacillus kunkeeiei
Weihua Ye1, Phani Rama Krishna Behra2, Karl Dyrhage2
1Department of Medical Biochemistry and Microbiology, Uppsala University, BMC Box 582, 75123 Uppsala, Sweden.
Journal of molecular biology
|February 14, 2024
概括
在Apilactobacillus kunkeei中新进化的蛋白质没有失序,而是采用简单,稳定的α-螺旋结构. 这表明新的折叠蛋白质可以通过简单的结构元素融合很容易出现和演变.
科学领域:
- 进化生物学是进化的生物学.
- 结构生物学是结构生物学.
- 生物物理学的生物物理.
背景情况:
- 新蛋白质的起源和进化是生物学的基本问题.
- 虽然生物信息学分析表明蛋白质的持续出现,但关于新型蛋白质结构和特性的实验数据很少.
- 了解最近进化的蛋白质的生物物理特征对于理解蛋白质进化至关重要.
研究的目的:
- 调查来自Apilactobacillus kunkeei的假定新蛋白质的结构和生物物理特性.
- 为了确定这些新型蛋白质是否本质上是无序的或采用稳定的构造.
- 探索 de novo 蛋白质出现和折叠的进化影响.
主要方法:
- 植物遗传学分析,以识别Apilactobacillus kunkeei.中的新型蛋白质候选者.
- 循环二重化 (CD) 光谱法用于评估二次结构含量.
- 光谱学和核磁共振 (NMR) 谱学用于研究蛋白质折叠和稳定性.
主要成果:
- 在Apilactobacillus kunkeei.中确定了48个假定的新型开放阅读框架.
- 实验数据显示,六种研究的蛋白质本质上没有失序.
- 这些蛋白质采用阿尔法螺旋主导的折叠状态,具有低热力学稳定性 (0-3 kcal/mol).
结论:
- 新进化的小蛋白质可以很容易地形成简单的,折叠的形状.
- 复杂的蛋白质三级结构可能通过基本的二级结构元素的融合而演变.
- 折叠蛋白质的新出现似乎是进化中的一个常见事件.
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