The role of arrestin alpha-helix I in receptor binding.

The role of arrestin alpha-helix I in receptor binding.
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抑制蛋白α-螺旋 I 在受体结合中的作用。

DOI:
10.1016/j.jmb.2009.10.058
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发表时间:
2010
影响因子:
5.6
通讯作者:
Gurevich,VsevolodV
Gurevich,VsevolodV
中科院分区:
生物学2区
文献类型:
--
作者:
Vishnivetskiy,SergeyA;Francis,Derek;VanEps,Ned;Kim,Miyeon;Hanson,SusanM;Klug,CandiceS;Hubbell,WayneL;Gurevich,VsevolodV

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阻滞素能迅速与其同源G蛋白偶联受体的磷酸化激活形式结合,从而阻止G蛋白偶联,并经常将信号切换到其他途径。两亲性α-螺旋I与受体结合有关,但其作用机制尚不清楚。在这里,我们表明,在螺旋本身和体内邻近的疏水残基的几个突变减少了抑制素1与光激活的磷酸化视紫红质(P-Rh⁎)的结合。在与P-Rh⁎和光激活的非磷酸化视紫红质都有高亲和力的磷酸化无关突变体的背景下,这些突变降低了arrestin与P-Rh⁎的复合物的稳定性,但不降低光激活的非磷酸化视紫红质的稳定性。利用定点自旋标记,我们发现α-螺旋I周围的局部结构在与视紫红质结合时发生了变化。然而,用双电子-电子共振测量的α-螺旋I与相邻的β-链I(或N-结构域的其余部分)之间的分子内距离没有改变,排除了由于受体结合而导致的螺旋的重新定位。综上所述,这些数据表明α-螺旋I在受体结合中起间接作用,可能使携带几个磷酸结合残基的β-链I处于有利于与受体结合的磷酸盐相互作用的位置。
Arrestins rapidly bind phosphorylated activated forms of their cognate G protein-coupled receptors, thereby preventing G protein coupling and often switching signaling to other pathways. Amphipathic α-helix I (residues 100–111) has been implicated in receptor binding, but the mechanism of its action has not been determined yet. Here we show that several mutations in the helix itself and in adjacent hydrophobic residues in the body of the N-domain reduce arrestin1 binding to light-activated phosphorylated rhodopsin (P-Rh⁎). On the background of phosphorylation-independent mutants that bind with high affinity to both P-Rh⁎and light-activated unphosphorylated rhodopsin, these mutations reduce the stability of the arrestin complex with P-Rh⁎, but not with light-activated unphosphorylated rhodopsin. Using site-directed spin labeling, we found that the local structure around α-helix I changes upon binding to rhodopsin. However, the intramolecular distances between α-helix I and adjacent β-strand I (or the rest of the N-domain), measured using double electron–electron resonance, do not change, ruling out relocation of the helix due to receptor binding. Collectively, these data demonstrate that α-helix I plays an indirect role in receptor binding, likely keeping β-strand I, which carries several phosphate-binding residues, in a position favorable for its interaction with receptor-attached phosphates.
抑制蛋白调节视紫红质去磷酸化。
DOI: --
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