Phosphorylation of riboflavin (RIB) results in the formation of the first cofactor, flavin mononucleotide (FMN). This reaction is catalyzed by riboflavin kinase (RFK), a cytosolic enzyme existing as a monomer. It utilizes either zinc or magnesium ions in the reaction.
Zhang, H, Osterman, AL, Karthikeyan, S, Grishin, NV, Mseeh, F, Zhou, Q
riboflavin kinase activity of RFK:Mg2+ [cytosol]
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