Background: Arrestin-1 with enhanced binding to unphosphorylated active rhodopsin (Rh*) has therapeutic potential. Results: Manipulation of the rhodopsin binding surface of arrestin-1 greatly increases its binding to Rh*. Conclusion: Stable arrestin-1 with high binding to Rh* can be engineered with and without the ability to self-associate. Significance: The affinity of arrestin-1 for Rh* and its propensity to oligomerize can be independently changed by targeted mutagenesis. Arrestin-1 preferentially binds active phosphorylated rhodopsin. Previously, a mutant with enhanced binding to unphosphorylated active rhodopsin (Rh*) was shown to partially compensate for lack of rhodopsin phosphorylation in vivo. Here we showed that reengineering of the receptor binding surface of arrestin-1 further improves the binding to Rh* while preserving protein stability. In mammals, arrestin-1 readily self-associates at physiological concentrations. The biological role of this phenomenon can only be elucidated by replacing wild type arrestin-1 in living animals with a non-oligomerizing mutant retaining all other functions. We demonstrate that constitutively monomeric forms of arrestin-1 are sufficiently stable for in vivo expression. We also tested the idea that individual functions of arrestin-1 can be independently manipulated to generate mutants with the desired combinations of functional characteristics. Here we showed that this approach is feasible; stable forms of arrestin-1 with high Rh* binding can be generated with or without the ability to self-associate. These novel molecular tools open the possibility of testing of the biological role of arrestin-1 self-association and pave the way to elucidation of full potential of compensational approach to gene therapy of gain-of-function receptor mutations.
Engineering Visual Arrestin-1 with Special Functional Characteristics*
S. Vishnivetskiy,Qiuyan Chen,M. Palazzo,E. Brooks,C. Altenbach,T. Iverson,W. Hubbell,V. Gurevich
Published 2012 in Journal of Biological Chemistry
ABSTRACT
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- Publication year
2012
- Venue
Journal of Biological Chemistry
- Publication date
2012-12-17
- Fields of study
Biology, Medicine, Engineering
- Identifiers
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- Source metadata
Semantic Scholar, PubMed
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