霍乱病毒的动态低度反应依赖于机械敏感通道MscSS
Kristen Ramsey1,2, Madolyn Britt1,3, Joseph Maramba1
1Department of Biology, University of Maryland, College Park, MD, USA.
iScience
|June 13, 2024
概括
霍乱病毒使用机器敏感通道 MscS 和 MscL 在透应激过程中释放代谢物. MscS在终止这种反应中发挥着关键作用,有证据表明道之间存在转录性交叉通话.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
背景情况:
- 霍乱病毒,一种格拉姆阴性细菌,适应环境变化,包括透应激.
- 机械敏感 (MS) 通道,MscS (低值) 和MscL (高值),参与细胞对机械应激和透转移的反应.
- 了解 MscS 和 MscL 在 V. cholerae 透适应中的特定作用,对于理解细菌生存机制至关重要.
研究的目的:
- 阐明MscS和MscL在Vibrio cholerae对透下移反应中的不同和相互作用作用.
- 描述由这些通道介导的解质释放的动力学和机制.
- 调查 MscS 和 MscL 之间可能存在的监管交叉.
主要方法:
- 产生V. cholerae O395突变的基因: ΔmscS, ΔmscL, 和 ΔmscL ΔmscS.
- 补丁电生理学,以表征电压依赖的通道激活.
- 停止流光散射以测量毫秒级的氧化物释放动力学.
- 开发用于溶和水流模拟的数值模型.
主要成果:
- MscS和MscL都在奥斯莫斯下移过程中促进了奥斯莫利特的释放,它们具有不同的动力特征.
- MscS被确定为终止透性反应的关键因素.
- 观察到 MscS 和 MscL 之间的功能相互作用和转录交叉 (MscS 在 ΔmscL 上调).
- 细胞存活与胀的程度,氧化物释放率和膜再密封效率相关.
结论:
- 霍乱病毒使用 MscS 和 MscL 的协调行动进行透适应.
- MscS在调节透反应持续时间方面发挥着重要作用.
- MscS和MscL之间的相互作用,包括转录调节,突出显示了V. cholerae中复杂的适应策略.
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