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Activation and inactivation steps in the visual transduction pathway
1Department of Ophthalmology, University of Washington, Box 356485, Seattle, Washington 98195-6485, USA. palczews@u.washington.edu
Current Opinion in Neurobiology
|August 1, 1997
Summary
Researchers identified the substance causing vision bleaching desensitization. Evidence suggests it is a complex of all-trans-retinal and opsin, recognized by rhodopsin kinase and arrestin.
Area of Science:
- Biochemistry
- Genetics
- Electrophysiology
- Vision Science
Background:
- Bleaching desensitization in vision impairs dark adaptation.
- The molecular mechanisms underlying this process remain incompletely understood.
Purpose of the Study:
- To elucidate the molecular identity of the substance responsible for bleaching desensitization.
- To investigate the role of specific proteins in this visual phenomenon.
Main Methods:
- Analysis of genetic, biochemical, and electrophysiological data.
- Examination of molecular defects associated with delayed dark adaptation.
Main Results:
- Evidence points to a complex of all-trans-retinal and opsin as the desensitizing substance.
- This complex is likely recognized by rhodopsin kinase and arrestin.
Conclusions:
- The molecular identity of the bleaching desensitization agent has been proposed.
- Rhodopsin kinase and arrestin are implicated in the recognition of this visual desensitizing complex.