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Published on: October 11, 2022

在极端盐度下,盐水调节了降低立体质量的Na

Pablo Artigas¹, Dylan J Meyer¹, Victoria C Young¹

¹Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, TX 79430.

Proceedings of the National Academy of Sciences of the United States of America

|December 11, 2023

概括

盐水通过改变它们的- ATPase (NKA) 来适应高盐. 在NKAα子单元中的特定素替代允许减少离子运输固态度,使得高盐环境中的度梯度更.

科学领域:

生物化学生化学
分子生物学分子生物学
环境科学环境科学

背景情况:

盐水 (Artemia) 独特地容忍极端的盐度 (> 4 M NaCl).
在Artemia中,盐分泌依赖于Na+,K+-ATPase (NKA) .
佳能NKA通常在每次ATP水解中输送3Na+为2K+.

研究的目的:

研究NKA在盐水中的分子适应性,以获得高盐度耐受性.
描述盐度调节的NKA α2_KK异形的结构和功能.
确定NKA中特定的氨基酸替代如何影响离子运输固态度.

主要方法:

De novo转录组组合和qPCR用于识别NKA子单元变异.
异质表达和 Cryo-EM 来确定结构.
电生理学和⁸⁶Rb⁺吸收试验来描述功能.

主要成果:

菌体表达正规的NKAα子单位 (α1_NN,α3_NN) 和盐度诱导的α2_KK异型.
该α2_KK异型在关键的跨膜域中具有氨酸替代 (Lys308,Lys758).
突变性研究证实,这些 lysine 替代物改变了 NKA 运输固态度,使其变化为 2 Na+:1 K+.
低温电磁波检测显示,离子结合腔内的Lys758具有封闭的形状.

结论:

该α2_KKNKA异型的独特氨酸残留物对于Artemia的高盐度适应至关重要.
改变的离子运输静电测量 (2Na+:1K+) 在高盐度条件下促进更的Na+梯度.
结构和功能洞察力揭示了NKA适应极端环境的新机制.

关键词:

Na+,K+-ATP 酶是一种电化学梯度的梯度是电化学梯度.他们是极端爱好者 (extremophiles).史泰基几何学 (Stoichiometry) 是一种测量体位的方法.转录组 (transcriptome) 是一个转录组.

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