Robust Self-Association Is a Common Feature of Mammalian Visual Arrestin-1

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• 作者：Miyeon Kim ; Susan M. Hanson ; Sergey A. Vishnivetskiy ; Xiufeng Song ; Whitney M. Cleghorn ; Wayne L. Hubbell ; Vsevolod V. Gurevich
• 刊名：Biochemistry
• 出版年：2011
• 出版时间：March 29, 2011
• 年：2011
• 卷：50
• 期：12
• 页码：2235-2242
• 全文大小：857K
• 年卷期：v.50,no.12(March 29, 2011)
• ISSN：1520-4995

文摘

Arrestin-1 binds light-activated phosphorhodopsin and ensures rapid signal termination. Its deficiency in humans and mice results in prolonged signaling and rod degeneration. However, most of the biochemical studies were performed on bovine arrestin-1, which was shown to self-associate forming dimers and tetramers, although only the monomer binds rhodopsin. It is unclear whether self-association is a property of arrestin-1 in all mammals or a specific feature of bovine protein. To address this issue, we compared self-association parameters of purified human and mouse arrestin-1 with those of its bovine counterpart using multiangle light scattering. We found that mouse and human arrestin-1 also robustly self-associate, existing in a monomer鈭抎imer鈭抰etramer equilibrium. Interestingly, the combination of dimerization and tetramerization constants in these three species is strikingly different. While tetramerization of bovine arrestin-1 is highly cooperative (K_D,dim⁴ > K_D,tet), K_D,dim K_D,tet in the mouse form and K_D,dim K_D,tet in the human form. Importantly, in all three species at very high physiological concentrations of arrestin-1 in rod photoreceptors, most of it is predicted to exist in oligomeric form, with a relatively low concentration of the free monomer. Thus, it appears that maintenance of low levels of the active monomer is the biological role of arrestin-1 self-association.