If an animal cell suddenly lost the ability to produce GTP, It would not be able to inactivate and activate the G protein on the cytoplasmic side of the plasma membrane, and this can happen to its signaling system.
Guanosine Triphosphate (GTP) is a nucleoside phosphate which comprised of a ribonucleoside and 3 phosphate groups. It also means that it has ribose as its sugar and 3 phosphate groups attached.
The function of GTP is to generate a conformational change in a macro-molecule by binding to that. Since it is easily hydrolyzed by various GTPases, the use of GTP as a best-controlling element allows a cyclic variation in macro-molecular shape.
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