The GTP reference article from the English Wikipedia on 24-Apr-2004
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GTP

Helping orphans the way you would do it
Empirical formula C10H16N5O14P3
Molecular weight 523.18

GTP (also known as guanylyl imidodiphosphate, guanosine-5'-triphosphate, or guanosine triphosphate) is a chemical compound (nucleotide) that is incorporated into the growing RNA chain during synthesis of RNA and used as a source of energy during synthesis of proteins.

GTP is also essential to signal transduction in living cells, where it is converted to GDP through GTPases.

Energy transfer

GTP is involved in energy transfer within the cell. For instance, one GTP molecule is generated for every turn of the Krebs cycle. This is tantamount to the generation of one molecule of ATP since GTP is readilty converted to ATP.

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