Riboflavin- vitamin B2
Riboflavin is known as vitamin B2, riboflavin was the
second B complex vitamin to be discovered. Riboflavin is the precursor for the
coenzymes, flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). The enzymes that require FMN or FAD as cofactors
are termed flavoproteins. Several flavoproteins also contain metal ions and are
termed metalloflavoproteins.
Both classes of enzymes are involved in a wide range of redox
reactions, e.g. succinate dehydrogenase and xanthine oxidase. During the enzymatic
reactions which involving the flavoproteins, the reduced forms of FMN and FAD
are formed, FMNH2 and FADH2, respectively. Physiological role of B2 is being
the precursor of riboflavin-5’-phosphate (FMN & FAD).
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