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...
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(from the article `rod`) ...isomerization (a change in configuration), forming all-trans-retinaldehyde. This isomerization activates the opsin protein, which then interacts ...
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http://www.britannica.com/eb/a-z/t/71
<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...
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http://www.encyclo.co.uk/local/20973
(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.
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http://www.encyclo.co.uk/local/21001
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.
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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.
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