Guanosine

Guanosine

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Chemical structure of guanosine

Guanosine is a nucleoside comprising the nucleobase guanine attached to a ribose (ribofuranose) ring via a _-N9-glycosidic bond. It is one of the four main nucleosides found in ribonucleic acid (RNA), the others being adenosine, cytidine, and uridine.

Structure and Properties

Guanosine consists of a guanine base linked to a ribose sugar. The chemical formula of guanosine is C₁₀H₁₃N₅O₅. The structure of guanosine allows it to participate in hydrogen bonding, which is crucial for the formation of the double helix structure of nucleic acids.

Biological Role

In the context of RNA, guanosine plays a critical role in the encoding of genetic information. It pairs with cytosine through three hydrogen bonds, contributing to the stability of the RNA structure. Guanosine is also involved in various cellular processes, including signal transduction and metabolism.

Metabolism

Guanosine is metabolized in the body to produce guanosine monophosphate (GMP), which is a precursor to guanosine triphosphate (GTP). GTP is an essential molecule in cellular energy transfer, protein synthesis, and signal transduction.

Synthesis

Guanosine can be synthesized in the laboratory through the chemical reaction of guanine with ribose. In biological systems, it is synthesized from inosine monophosphate (IMP) through a series of enzymatic reactions.

Applications

Guanosine and its derivatives are used in various research and clinical applications. They are important in the study of nucleic acid interactions and are used in the development of antiviral and anticancer drugs.

Related Pages

• Nucleoside
• Nucleotide
• RNA
• Guanine
• Cytosine