Inhibition of retinal guanylyl cyclase by the RGS9-1 N-terminus.

Inhibition of retinal guanylyl cyclase by the RGS9-1 N-terminus.
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RGS9-1 N 末端抑制视网膜鸟苷酸环化酶。

DOI:
10.1006/bbrc.2001.5346
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发表时间:
2001
期刊:
Biochemical and biophysical research communications.
影响因子:
--
通讯作者:
Yamazaki,A
Yamazaki,A
中科院分区:
--
文献类型:
--
作者:
Yu,H;Bondarenko,VA;Yamazaki,A

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环GMP在视网膜光传导中起着关键作用,其感光细胞浓度由环GMP磷酸二酯酶(PDE)和视网膜鸟苷酸环化酶(retGC)的协同作用精确控制。然而,这两个系统之间的关系的研究只集中在Ca 2+介导的,间接的连接。使用视网膜“G蛋白信号传导调节器”(RGS 9 -1)及其片段,我们表明RGS 9 -1的N-末端抑制retGC活性。我们还表明,GGL结构域和/或RGS结构域的功能作为一个内部抑制剂对N-末端,这表明结合到这些结构域的蛋白质调节N-末端的抑制活性。retGC与RGS 9 -1及其N-末端的直接相互作用也通过免疫沉淀和覆盖技术证明。由于RGS 9 -1还通过调节transducin的GT3活性来控制transducin激活的PDE的寿命,因此本研究强烈表明RGS 9 -1介导PDE和retGC系统之间的直接相互作用,并且这种巧妙的机制在调节光感受器中的cGMP浓度中起重要作用。
Cyclic GMP plays a key role in retinal phototransduction and its photoreceptor concentration is precisely controlled by the cooperative action of cGMP phosphodiesterase (PDE) and retinal guanylyl cyclase (retGC). However, studies of the relationship between these two systems have focused only on a Ca2+-mediated, indirect connection. Using a retinal “regulator of G-protein signaling” (RGS9-1) and its fragments, we show that the N-terminus of RGS9-1 inhibits retGC activity. We also indicate that the GGL domain and/or the RGS domain function as an internal suppressor against the N-terminus, suggesting that proteins bound to these domains regulate the inhibitory activity of the N-terminus. Direct interaction of retGC with RGS9-1 and its N-terminus is also proved by immunoprecipitation and an overlay technique. Since RGS9-1 also controls the lifetime of transducin-activated PDE through regulating GTPase activity of transducin, this study strongly suggests that RGS9-1 mediates the direct interaction between PDE and retGC systems, and that this ingenious mechanism plays an important role in tuning of cGMP concentration in photoreceptors.
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