突变性囊性纤维化转膜导电性调节器的处理是温度敏感的
G M Denning1, M P Anderson, J F Amara
1Howard Hughes Medical Institute, University of Iowa College of Medicine, Iowa City 52242.
Nature
|August 27, 1992
概括
最常见的囊性纤维化突变,CFTR delta F508,是温度敏感的. 降低化温度可以纠正蛋白质处理缺陷,恢复血膜中cAMP调节的化物通道功能.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 囊性纤维化跨膜导电调节器 (CFTR) 是一个关键的血膜化物通道.
- 在CFTR的突变,像常见的三角形F508删除,通过损害化物透性导致囊性纤维化.
- 之前的研究表明,在不同温度下CFTR delta F508功能的结果相矛盾.
研究的目的:
- 为了研究温度对CFTR delta F508突变体的处理和功能的影响.
- 为了协调不同细胞系统中CFTR delta F508活动的相互矛盾的发现.
- 为了确定CFTR delta F508是否表现出温度敏感性.
主要方法:
- 在各种细胞类型 (Xenopus卵细胞,Vero细胞,Sf9昆虫细胞) 中表达CFTR delta F508.
- 在蛋白质表达和加工过程中操纵化温度.
- 评估CFTR delta F508蛋白质的加工和定位.
- 测量cAMP调节的化物通道活性.
主要成果:
- 降低的化温度恢复了CFTR delta F508处理向野生类型的水平.
- 纠正CFTR delta F508的处理导致其传递到等离子体膜.
- 当通过降温纠正处理缺陷时,在血膜中检测到功能性cAMP调节的化物通道.
结论:
- 这种CFTR delta F508突变对温度敏感.
- 温度依赖的蛋白质处理是CFTR delta F508功能的关键.
- 这些发现解释了以前的差异,并强调温度是CFTR研究的关键因素.
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