Transducin

Transducin is a protein in the visual process that binds GTP after activation by a form of rhodopsin called bathorhodopsin (Figure 19.27, see also here). The transducin-GTP complex can bind to a specific phosphodiesterase that cleaves cyclic GMP to GMP. This, in turn, stimulates a cascade of events that generates a visual signal to the brain.

See also: G Proteins in Vision, Vitamin A, Chemistry of Photoreception

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