通过表达克隆识别的新哺乳动物化物通道
1Department of Pharmacology, Mayo Foundation, Rochester, Minnesota 55905.
Nature
|March 19, 1992
概括
研究人员从上皮细胞中发现了一种新的化物通道蛋白. 这种蛋白质,当表达时,通过核酸阻塞的不敏感电流进行,这表明一种新的离子通道类.
科学领域:
- 分子生物学分子生物学
- 细胞生理学 细胞生理学
- 离子通道研究研究
背景情况:
- 离子通道对于调节细胞刺激性和体积至关重要.
- 了解新的离子通道机制对于细胞功能研究至关重要.
研究的目的:
- 从上皮细胞中识别和描述一种新的化物通道.
- 阐明这个新道的功能性质和调节机制.
主要方法:
- 来自上皮细胞系的补充DNA (cDNA) 的表达克隆.
- 通过位点定向突变发生的途径对假定通道蛋白的测序和结构检查.
- 在Xenopus卵细胞中的功能表达以分析离子电流.
主要成果:
- 一个编码235氨基酸蛋白的cDNA被分离和表达.
- 表达的蛋白质产生了化物选择性的向外电流.
- 这种电流是外观纠正的,对不敏感,并被细胞表面核酸阻塞.
- 假定核酸结合部位的突变取消了核酸阻断,并引入了依赖.
结论:
- 已经确定了一种新的化物离子通道类别,与以前克隆的通道不同.
- 该通道的独特序列和核酸敏感性表明了对离子运输调节的新机制.
- 这一发现为了解上皮细胞功能和相关疾病开辟了新的途径.
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