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Biosynthesis takes place in bacteria, fungi and plants, but not animals. [5] The biosynthetic precursors to riboflavin are ribulose 5-phosphate and guanosine triphosphate. The former is converted to L-3,4-dihydroxy-2-butanone-4-phosphate while the latter is transformed in a series of reactions that lead to 5-amino-6-(D-ribitylamino)uracil.
Flavin mononucleotide (FMN), or riboflavin-5′-phosphate, is a biomolecule produced from riboflavin (vitamin B 2) by the enzyme riboflavin kinase and functions as the prosthetic group of various oxidoreductases, including NADH dehydrogenase, as well as a cofactor in biological blue-light photo receptors. [1]
Dietary supplements containing all eight are referred to as a vitamin B complex. Individual B vitamins are referred to by B-number or by chemical name, such as B 1 for thiamine, B 2 for riboflavin, and B 3 for niacin, [1] [2] while some are more commonly recognized by name than by number, such as pantothenic acid (B 5), biotin (B 7), and folate ...
Theorell confirmed the pigment to be riboflavin's phosphate ester, flavin mononucleotide (FMN) in 1937, which was the first direct evidence for enzyme cofactors. [5] Warburg and Christian then found FAD to be a cofactor of D-amino acid oxidase through similar experiments in 1938. [6]
The enzyme FAD-AMP lyase (cyclizing) (EC 4.6.1.15) catalyzes the reaction . FAD AMP + riboflavin cyclic-4′,5′--phosphate. This enzyme belongs to the family of lyases, specifically the class of phosphorus-oxygen lyases.
Ribose 5-phosphate (R5P) is both a product and an intermediate of the pentose phosphate pathway. The last step of the oxidative reactions in the pentose phosphate pathway is the production of ribulose 5-phosphate. Depending on the body's state, ribulose 5-phosphate can reversibly isomerize to ribose 5-phosphate.
Vitamin B 6 Drug class Pyridoxal 5'-phosphate, the metabolically active form of vitamin B 6 Class identifiers Use Vitamin B 6 deficiency ATC code A11H Biological target enzyme cofactor Clinical data Drugs.com International Drug Names External links MeSH D025101 Legal status In Wikidata Vitamin B 6 is one of the B vitamins, and is an essential nutrient for humans. The term essential nutrient ...
In enzymology, a riboflavin phosphotransferase (EC 2.7.1.42) is an enzyme that catalyzes the chemical reaction. alpha-D-glucose 1-phosphate + riboflavin D-glucose + FMN. Thus, the two substrates of this enzyme are alpha-D-glucose 1-phosphate and riboflavin, whereas its two products are D-glucose and FMN.
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