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Light activated rhodopsin interacts with domains on all three subunits of transducin. Two of these domains, the C-terminal regions of the alpha and gamma subunits mimic the ability of transducin to stabilize the active conformation of rhodopsin, metarhodopsin II, but display different roles in transducin activation process. Whether the interactions are with the same or different complimentary sites...
Rhodopsin, a prototypical G protein-coupled receptor, catalyzes the activation of a heterotrimeric G protein, transducin, to initiate a visual signaling cascade in photoreceptor cells. The βγ subunit complex, especially the C-terminal domain of the transducin γ subunit, Gtγ(60-71)farnesyl, plays a pivotal role in allosteric regulation of nucleotide exchange on the transducin α subunit by light-activated...
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