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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Ca(2+)-binding proteins in the retina: structure, function, and the etiology of human visual diseases.

The complex sensation of vision begins with the relatively simple photoisomerization of the visual pigment chromophore 11-cis-retinal to its all-trans configuration. This event initiates a series of biochemical reactions that are collectively referred to as phototransduction, which ultimately lead to a change in the electrochemical signaling of the photoreceptor cell. To operate in a wide range of light intensities, however, the phototransduction pathway must allow for adjustments to background light. These take place through physiological adaptation processes that rely primarily on Ca(2+) ions. While Ca(2+) may modulate some activities directly, it is more often the case that Ca(2+)-binding proteins mediate between transient changes in the concentration of Ca(2+) and the adaptation processes that are associated with phototransduction. Recently, combined genetic, physiological, and biochemical analyses have yielded new insights about the properties and functions of many phototransduction-specific components, including some novel Ca(2+)-binding proteins. Understanding these Ca(2+)-binding proteins will provide a more complete picture of visual transduction, including the mechanisms associated with adaptation, and of related degenerative diseases.[1]

References

  1. Ca(2+)-binding proteins in the retina: structure, function, and the etiology of human visual diseases. Palczewski, K., Polans, A.S., Baehr, W., Ames, J.B. Bioessays (2000) [Pubmed]
 
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