The role of arrestin alpha-helix I in receptor binding.
The role of arrestin alpha-helix I in receptor binding.
复制标题
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
复制
发表时间:
2010
影响因子:
5.6
通讯作者:
Gurevich,VsevolodV
中科院分区:
文献类型:
--
作者:
Vishnivetskiy,SergeyA;Francis,Derek;VanEps,Ned;Kim,Miyeon;Hanson,SusanM;Klug,CandiceS;Hubbell,WayneL;Gurevich,VsevolodV
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.
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DOI:
--
发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Palczewski,K;McDowell,JH;Jakes,S;Ingebritsen,TS;Hargrave,PA
通讯作者:
Hargrave,PA
DOI:
10.1021/bi982643l
发表时间:
1999
期刊:
Biochemistry.
影响因子:
--
作者:
Smith,WC;McDowell,JH;Dugger,DR;Miller,R;Arendt,A;Popp,MP;Hargrave,PA
通讯作者:
Hargrave,PA
DOI:
--
发表时间:
2000
期刊:
Investigative ophthalmology & visual science.
影响因子:
--
作者:
Smith,WC;Gurevich,EV;Dugger,DR;Vishnivetskiy,SA;Shelamer,CL;McDowell,JH;Gurevich,VV
通讯作者:
Gurevich,VV
影响因子:
2.9
作者:
Milano, SK;Pace, HC;Benovic, JL
通讯作者:
Benovic, JL
影响因子:
13.8
作者:
Fowler, CJ
通讯作者:
Fowler, CJ