囊性纤维化外膜导电调节器:核酸与合成酸结合
P J Thomas1, P Shenbagamurthi, X Ysern
1Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
概括
囊性纤维化突变会影响蛋白质的核酸结合部位. 一个合成的在关键残留物被删除时显示出改变的核酸结合,影响蛋白质结构和功能.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 遗传学 是一个遗传学.
背景情况:
- 囊性纤维化与囊性纤维化跨膜导电性调节器 (CFTR) 蛋白质的突变有关.
- 许多CFTR突变聚集在一个形成核酸结合的区域.
研究的目的:
- 研究CFTR核酸结合部位的结构和功能性质.
- 确定氨在CFTR功能中的508位 (Phe508) 的作用.
主要方法:
- 代表CFTR核酸结合区域的67氨基酸 (P-67) 的化学合成和净化.
- 使用三甲 (TNP) 衍生物和ATP的亚丁氨酸核酸结合试验.
- 循环二重化谱法分析的二次结构.
主要成果:
- 该P-67成功结合了腺核酸,并确定了特定的解离常量 (Kd).
- 循环二元化证实P-67采用β片结构,与预测一致.
- Phe508定位在P-67中的β链上.
结论:
- 该P-67作为CFTR核酸结合部位的模型.
- 预计Phe508的删除会破坏β链结构并损害核酸结合.
- 这种结构变化可能有助于囊性纤维化病原体.
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