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Crystal structure of p44, a constitutively active splice variant of visual arrestin

机译:p44的晶体结构,视觉抑制蛋白的组成型活性剪接变体

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Visual arrestin specifically binds to photoactivated and phosphorylated rhodopsin and inactivates phototransduction. In contrast, the p44 splice variant can terminate phototransduction by binding to nonphosphorylated light-activated rhodopsin. Here we report the crystal structure of bovine p44 at a resolution of 1.85 ?. Compared to native arrestin, the p44 structure reveals significant differences in regions crucial for receptor binding, namely flexible loop V-VI and polar core regions. Additionally, electrostatic potential is remarkably positive on the N-domain and the C-domain. The p44 structure represents an active conformation that serves as a model to explain the 'constitutive activity' found in arrestin variants.
机译:视觉抑制蛋白特异性结合光活化和磷酸化的视紫红质,并使光转导失活。相反,p44剪接变体可以通过与未磷酸化的光激活视紫红质结合而终止光转导。在这里,我们报告了牛p44的晶体结构,分辨率为1.85?。与天然抑制蛋白相比,p44结构在受体结合至关重要的区域(即柔性环V-VI和极性核心区域)显示出显着差异。另外,N域和C域的静电势显着为正。 p44结构代表一种活性构象,可作为模型来解释在抑制蛋白变体中发现的“组成型活性”。

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