调节体积的化物通道的分子识别
1Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno 89557-0046, USA.
Nature
|December 6, 1997
概括
化物电流 (ICl.vol) 调节重要细胞功能,但其来源仍然未知. 研究人员确定ClC-3为哺乳动物细胞中ICl.vol的蛋白质.
科学领域:
- 细胞生理学 细胞生理学
- 分子生物学分子生物学
- 离子通道研究研究
背景情况:
- 容量调节的化物电流 (ICl.vol) 对哺乳动物的许多细胞过程至关重要,包括电活动,pH调节和增殖.
- 负责ICl.vol的道的分子身份仍然难以捉摸,尽管对P-糖蛋白,pICln和ClC-2等候选者的调查.
研究的目的:
- 为了确定负责哺乳动物细胞中无处不在的体积调节流 (ICl.vol) 的分子成分.
- 描述候选化物通道ClC-3的功能性质,与ICl.vol.相关.
主要方法:
- 在NIH/3T3细胞中的ClC-3心脏克隆的功能表达.
- 电生理学记录以评估化物导电性及其根据细胞体积的调制.
- ClC-3的局部定向突变发生,以调查特定残留物在通道功能中的作用.
主要成果:
- 在NIH/3T3细胞中,ClC-3的表达产生了由细胞胀激活的显著导率,反映了原生ICl.vol特性.
- 在ClC-3中发生的一种特定突变 (N579K) 改变了离子选择性,并取消了向外纠正,但保留了胀激活.
- ClC-3表现出与长期寻求的ICl.vol.分子基础相一致的特征.
结论:
- 在许多哺乳动物细胞中,ClC-3被确定为编码体积调节的流 (ICl.vol) 的蛋白质.
- 这些发现为关键的细胞运输机制提供了分子理解.
- 这项研究涉及ClC-3在由细胞体积调节的多种生理和病理过程中.
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