See Also: Transducin(health)
Transducin(medicine)
transducin GTP phosphohydrolase(medicine)
Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
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Orthomolecular medicine (orthomolecular nutritional medicine, orthomolecular therapy)(health)
medicine man(encyclopedia)
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Transducin (medicine)


transducin
<protein> A GTP-binding protein found in the disc membrane of retinal rods and cones: of the part of the cascade involved in transduction of light to a nervous impulse.

A complex of three subunits, alpha (39 kD), beta (36 kD) and gamma (8 kD). Photoexcited rhodopsin interacts with transducin and promotes the exchange of GTP for GDP on the _ subunit.

The GTP _ subunit dissociates from the complex and activates a cGMP phospodiesterase by removing an inhibitory subunit. The _ subunit of transducin can be ADP ribosylated by cholera toxin and pertussis toxin.