transducin

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; a (39 kD), b (36 kD) and g (8 kD). Photoexcited rhodopsin interacts with transducin and promotes the exchange of GTP for GDP on the a subunit. The GTP- a subunit dissociates from the complex and activates a cGMP-phosphodiesterase by removing an inhibitory subunit. The a subunit of transducin can be ADP-ribosylated by cholera toxin and pertussis toxin. ...

Transducin

Transducin (Gt) is a heterotrimeric G protein with three polypeptide chains characterized into two subunits: α, β and γ. Transducin is naturally expressed in vertebrate retina rods and cones, with different α subunits in rod and cone photoreceptors. Transducin is a very important G-protein in vertebrate phototransduction. == Function in Photot...
Found on http://en.wikipedia.org/wiki/Transducin

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...
Found on http://www.encyclo.co.uk/local/20973

transducin

(from the article `rod`) ...isomerization (a change in configuration), forming all-trans-retinaldehyde. This isomerization activates the opsin protein, which then interacts ...
Found on http://www.britannica.com/eb/a-z/t/71

transducin

(trans-doo´sin) a of the retinal rods that interacts with activated rhodopsin as part of the process of triggering a nerve impulse in vision.
Found on http://www.encyclo.co.uk/local/21001

transducin

Type: Term Pronunciation: tranz-dū′sin Definitions: 1. A protein that binds guanine nucleotides (a G protein), found in retinal rods and cones, that plays a major role in signal transduction; in vertebrate rod cells it acts as a link of the photolysis of rhodopsin to the activation of cGMP phosphodiesterase.
Found on http://www.medilexicon.com/medicaldictionary.php?t=93212
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