IUBMB Enzyme Nomenclature


Accepted name: molybdenum cofactor cytidylyltransferase

Reaction: CTP + molybdenum cofactor = diphosphate + cytidylyl molybdenum cofactor

For diagram of reaction click here.

Glossary: molybdenum cofactor = MoCo = MoO2(OH)Dtpp-mP = {[(5aR,8R,9aR)-2-amino-4-oxo-6,7-bis(sulfanyl-kS)-1,5,5a,8,9a,10-hexahydro-4H-pyrano[3,2-g]pteridin-8-yl]methyl dihydrogenato(2-) phosphate}(dioxo)molybdate

Other name(s): MocA, CTP:molybdopterin cytidylyltransferase, MoCo cytidylyltransferase, Mo-MPT cytidyltransferase

Systematic name: CTP:molybdenum cofactor cytidylyltransferase

Comments: Catalyses the cytidylation of the molybdenum cofactor. This modification occurs only in prokaryotes. Divalent cations such as Mg2+ or Mn2+ are required for activity. ATP or GTP cannot replace CTP.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Neumann, M., Mittelstadt, G., Seduk, F., Iobbi-Nivol, C. and Leimkuhler, S. MocA is a specific cytidylyltransferase involved in molybdopterin cytosine dinucleotide biosynthesis in Escherichia coli. J. Biol. Chem. 284 (2009) 21891-21898. [PMID: 19542235]

2. Neumann, M., Seduk, F., Iobbi-Nivol, C. and Leimkuhler, S. Molybdopterin dinucleotide biosynthesis in Escherichia coli: Identification of amino acid residues of molybdopterin dinucleotide transferases that determine specificity for binding of guanine or cytosine nucleotides. J. Biol. Chem. 286 (2011) 1400-1408. [PMID: 21081498]

[EC created 2011]

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