名词解析

IP3 receptor (IP3受体)

正确答案

是一种内质网通道蛋白,由四个相对分子质量为260kDa的糖蛋白组成的四聚体。四个亚基组成一个跨膜的通道,每个亚基都有IP3结合的部位,当3~4个部位被IP3占据时,受体复合物构象发生改变,打开离子通道,储藏在内质网中的Ca2+随即释放,进入胞质溶胶。

答案解析

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