通过小册子和自抑制域在小鼠1型IP3受体中的长距离隔离调节
Kozo Hamada1, Akiko Terauchi2, Kyoko Nakamura3
1Department of Biosciences and Bioinformatics, School of Science, Xi'an Jiaotong-Liverpool University (XJTLU), 111 Ren'ai Road, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China; Suzhou Municipal Key Lab of Cancer Biology and Chronic Disease, School of Science, Xi'an Jiaotong-Liverpool University (XJTLU), 111 Ren'ai Road, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China; Suzhou Municipal Key Lab of Metabolic Syndrome and Drug Research, School of Science, Xi'an Jiaotong-Liverpool University (XJTLU), 111 Ren'ai Road, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China.
伊诺西1,4,5-三酸盐受体 (IP3R) 使用具有保存IEI动机的传单域来传输IP3结合信号以释放. 在C端的自抑制域调节这种通道门.
科学领域:
- 分子生物学分子生物学
- 细胞生理学 细胞生理学
- 生物化学 生物化学
背景情况:
- 伊诺西1,4,5-三酸盐受体 (IP3R) 是一个关键的通道,调节细胞内 (Ca2+) 从内细胞网膜释放.
- 结构数据表明IP3结合部位和Ca2+孔之间的距离很大,这意味着通道封闭需要复杂的力传递机制.
研究的目的:
- 阐明IP3结合和IP3R通道封锁之间的远程力传递的分子机制.
- 确定IP3R功能和监管至关重要的特定领域和残留物.
主要方法:
- 在IP3R传单领域内保存残留物的位点定向突变发生.
- IP3R C端域的删除突变发生.
- 测量IP3诱导的Ca2+释放以评估通道功能.
主要成果:
- 在传单域中将保存的异黄素-谷氨酸-异黄素 (IEI) 基因转变为甘氨酸取消了IP3R通道功能.
- 删除C端31氨基酸显著增强了IP3诱导的Ca2+释放,将其确定为自身抑制域 (AID).
- 在传递IP3诱导的形状变化方面,IEI基因是至关重要的,而C端AID则以异构调节门.
结论:
- 叶片域中的IEI图案对于IP3R激活至关重要,它通过传递带诱导的孔状变化来传递IP3R.
- C终端自抑制域从远处调节IP3R门,这表明一种双重调节机制.
- 这些发现为IP3R如何微调细胞平衡的信号提供了洞察力.
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