Flavin mononucleotide

Flavin mononucleotide v2

Flavin mononucleotide (FMN), also known as riboflavin-5'-phosphate, is a biomolecule derived from riboflavin (vitamin B2). It functions as a coenzyme for various oxidative enzymes and is a crucial component in the electron transport chain.

Structure and Function

FMN is formed by the phosphorylation of riboflavin. It consists of a riboflavin moiety linked to a phosphate group. The molecule plays a vital role in the biochemical processes of cells, particularly in redox reactions. FMN can accept two electrons and two protons to form FMNH2, making it an essential cofactor for flavoproteins.

Biological Role

FMN is involved in several key biological processes:

• It acts as a prosthetic group for flavoproteins, which are involved in oxidation-reduction reactions.
• It is a component of NADH dehydrogenase (Complex I) in the electron transport chain, which is crucial for cellular respiration.
• FMN is also involved in the metabolism of various amino acids, lipids, and carbohydrates.

Synthesis and Metabolism

FMN is synthesized in the body from riboflavin through the action of the enzyme riboflavin kinase. It can be further converted into flavin adenine dinucleotide (FAD) by the enzyme FAD synthetase. Both FMN and FAD are essential for the proper functioning of various metabolic pathways.

Clinical Significance

Deficiency in riboflavin can lead to a decrease in FMN and FAD levels, which can result in various health issues, including ariboflavinosis. Symptoms of riboflavin deficiency include sore throat, redness and swelling of the lining of the mouth and throat, cracks or sores on the outsides of the lips (cheilosis) and at the corners of the mouth (angular stomatitis), and inflammation and redness of the tongue (magenta tongue).

Related Pages

• Riboflavin
• Flavoprotein
• Electron transport chain
• NADH dehydrogenase
• Cellular respiration
• Oxidation-reduction reaction
• Metabolic pathway