Kv1.2 通过跨膜莱克LMAN2进行Kv1.2 红氧敏感的调节2
Shawn M Lamothe1, Damayantee Das1, Anson A Wong1
1Department of Pharmacology, Alberta Diabetes Institute, University of Alberta, 9-70 Medical Sciences Building, Edmonton AB T6G 2H7, Canada.
电压 1.2 (Kv1.2) 通道显示出由细胞外氧化还原潜力影响的可变. 确定了LMAN2的跨膜讲蛋白作为一个关键调节器,模仿氧化还原效应并影响Kv1.2通道功能.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- 电压化 (Kv) 1.2通道对于神经刺激性和动作潜力的传播至关重要.
- 与相关的Kv1通道不同的是,Kv1.2通道在电压依赖的网关中显示出显著的变化.
- 细胞外的氧化还原潜力是已知的Kv1.2关变性的调节器.
研究的目的:
- 为了确定调节Kv1.2通道封闭的外部因素.
- 研究候选调节蛋白在Kv1.2通道功能中的作用.
- 阐明KV1.2通道依赖氧化还原调制的基础机制.
主要方法:
- 使用补丁电生理学对52个候选基因的功能选.
- 细胞系中LMAN2与Kv1.2通道的同表达和淘汰 (shRNA) 研究.
- 位点定向的突变发生,以确定LMAN2和氧化还原敏感性的关键残留物.
主要成果:
- LMAN2与Kv1.2通道的同时表达导致激活的去极化转移并减缓了动力学.
- 过度表达LMAN2模仿了细胞外还原条件,促进了缓慢的门禁模式.
- 敲除LMAN2降低了Kv1.2的氧化还原灵敏度和门变异性.
- 在S2-S3链接器中F251/T252的突变取消了LMAN2和氧化还原敏感性.
结论:
- LMAN2被确定为一种调节蛋白,影响Kv1.2通道的氧化还原依赖调制.
- LMAN2和细胞外氧化还原潜力可能通过共享的调节途径起作用.
- 在Kv1.2 S2-S3链接器中的特定残留物 (F251,T252) 对LMAN2和氧化还原灵敏度至关重要.
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