乳酸脱酶-A的结构和功能的温度适应反映了几个关键蛋白质区域的融合进化
Xiao-Lu Zhu1,2,3, Ming-Ling Liao1,2, Lin-Xuan Ma1,2
1The Key Laboratory of Mariculture, Ministry of Education, Fisheries College, Ocean University of China, Qingdao 266003, China.
概括
鱼类中的酶热适应主要是由于影响蛋白质结构和功能的几个关键氨基酸替代而产生的. 这些发现揭示了热适应相关序列位点 (TRSS) 的融合进化,并有助于预测物种.
科学领域:
- 生物化学 生物化学
- 进化生物学 进化生物学
- 遗传学 遗传学 是一个
背景情况:
- 酶结构和功能的热稳定性对于生物体的热最佳和极限至关重要.
- 了解热适应机制提供了对蛋白质演变和温度转移后果的洞察.
- 以前的研究表明,有限的氨基酸替代驱动了适应性变化,但种群之间的融合不清楚.
研究的目的:
- 为了调查是否类似的热适应相关序列位点 (TRSS) 和氨基酸变化发生在不同的种群中.
- 为了在适应不同温度的海洋鱼类的乳酸脱酶-A (LDH-A) ортолог中识别TRSS.
- 为了验证已识别的TRSS变体的功能重要性.
主要方法:
- 分析了277个乳酸脱酶-A (LDH-A) 基因组,这些基因组来自居住在不同热环境中的海洋鱼类.
- 在不同物种中确定了潜在的热适应相关序列位点 (TRSS).
- 利用斑马鱼LDH-A的位点定向突变发生,以实验验证TRSS变异的作用.
主要成果:
- 酶的热适应是由少量的氨基酸替代驱动的,这影响了关键蛋白质区域的疏水性.
- 在涉及跨鱼类LDH-A温度适应的特定TRSS中观察到引人注目的趋同.
- 在斑马鱼LDH-A中成功重建了已识别的TRSS变体,证实了它们的功能意义.
结论:
- 特定TRSS的融合进化是鱼类LDH-A热适应的主要机制.
- 这项研究提供了对氨基酸替代驱动温度适应的见解.
- 这些发现支持开发深度学习模型,用于预测物种的热极限和对气候变化的反应.
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