GTP, or guanosine triphosphate, is a nucleotide that plays a crucial role in cellular processes. It consists of a guanine base, a ribose sugar, and three phosphate groups. GTP is essential for protein synthesis and serves as an energy source, similar to adenosine triphosphate (ATP). It is involved in signaling pathways and helps regulate various cellular functions. In addition to its role in energy transfer, GTP is important in the synthesis of RNA during transcription. It acts as a substrate for RNA polymerase, the enzyme responsible for creating RNA from a DNA template. GTP is also involved in the activation of certain proteins, influencing cellular activities and responses.