Guanosine triphosphate (GTP) 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 similar to adenosine triphosphate (ATP) and serves as an energy source for various biochemical reactions. In addition to energy transfer, GTP is essential for protein synthesis and signal transduction. It acts as a substrate for the synthesis of RNA during transcription and is involved in the activation of G-proteins, which help transmit signals within cells.