GTP
![](http://photos1.blogger.com/blogger/4566/894/400/GDP-GTP.jpg)
GTP is generated in the citric acid cycle, and is an important energy molecule. GTP is most important in its role as a molecular switch in signal transduction.
GTPases hydrolyze GTP to GDP + Pi in the highly conserved domains of G-proteins, which are associated with GPCRs (guanine nucleotide-binding protein-coupled receptors, G-protein coupled receptors, serpentine receptors, 7TM receptors, or heptahelical receptors).
![](http://photos1.blogger.com/blogger/2040/1480/400/GTP.jpg)
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