EC - FAD:protein FMN transferase

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IntEnz Enzyme Nomenclature


Accepted name:
FAD:protein FMN transferase
Other names:
flavin transferase
apbE (gene name)
Systematic name:
FAD:protein riboflavin-5'-phosphate transferase




The enzyme catalyses the transfer of the FMN portion of FAD and its covalent binding to the hydroxyl group of an L-threonine residue in a target flavin-binding protein such as the B and C subunits of EC, NADH:ubiquinone reductase (Na+-transporting). Requires Mg2+.

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB
UniProtKB/Swiss-Prot: (14) [show] [UniProt]


  1. Bertsova, Y. V., Fadeeva, M. S., Kostyrko, V. A., Serebryakova, M. V., Baykov, A. A., Bogachev, A. V.
    Alternative pyrimidine biosynthesis protein ApbE is a flavin transferase catalyzing covalent attachment of FMN to a threonine residue in bacterial flavoproteins.
    J. Biol. Chem. 288: 14276-14286 (2013). [PMID: 23558683]

[EC created 2013]