配体如何调节胃H,K-ATPase活性,以及其由泰戈普拉桑抑制
Nicole T Cerf1, Gerardo Zerbetto de Palma1, Natalya U Fedosova2
1Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Universidad de Buenos Aires, Instituto de Química y Fisicoquímica Biológicas "Prof. Alejandro C. Paladini" (IQUIFIB), Buenos Aires, Argentina.
The Journal of biological chemistry
|November 15, 2024
概括
竞争性酸阻断剂 (P-CABs) 如泰戈普拉桑与胃H,K-ATPase相互作用. 这项研究揭示了tegoprazan的存在.
科学领域:
- 生物化学 生物化学
- 药理学 药理学是指药理学的学科.
- 分子生物学分子生物学
背景情况:
- 竞争性酸阻断剂 (P-CABs) 在抑制胃H,K-ATPase方面取得了重大进展.
- 新型P-CABs的开发是一个活跃的研究领域.
研究的目的:
- 研究H,K-ATPase和泰戈普拉桑之间的相互作用,重点关注K+和H+结合.
- 阐明P-CABs抑制的功能和结构基础.
主要方法:
- 酶活性测定以确定动力参数和抑制.
- 分子动力学模拟用于分析抑制剂-蛋白相互作用.
- 结构分析以了解绑定站点动态.
主要成果:
- 鉴定了H,K-ATPase的乒乓球机制,表明H+,K+和ATP的1:1:1稳定性.
- 泰戈普拉桑结合H,K-ATPase的两个不同的中间状态,其亲和度不同 (pH 7.2时0.56 ± 0.04 μM和2.70 ± 0.24 μM).
- 分子动力学表明,K+的存在改变了泰戈普拉桑与跨膜残留物的相互作用,这解释了K+度较高时的 afinity 降低. 泰戈普拉桑的质子化会诱导形状变化,在低pH下增强结合.
结论:
- 这项研究提供了对泰戈普拉桑抑制H,K-ATPase的动态和结构机制的见解.
- 这些发现解释了基于K+度和pH的特戈普拉桑的差异性亲和力.
- 结果为设计改进的P-CABs配体提供了基础.
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