IUBMB Enzyme Nomenclature


Accepted name: nicotinate D-ribonucleotide:phenol phospho-D-ribosyltransferase

Reaction: nicotinate D-ribonucleotide + phenol = nicotinate + phenyl 5-phospho-α-D-ribofuranoside

Other name(s): ArsAB

Systematic name: nicotinate D-ribonucleotide:phenol phospho-D-ribosyltransferase

Comments: The enzyme is involved in the biosynthesis of phenolic cobamides in the Gram-positive bacterium Sporomusa ovata. It can also transfer the phospho-D-ribosyl group to 4-methylphenol and 5,6-dimethylbenzimidazole. The related EC, nicotinate-nucleotide dimethylbenzimidazole phosphoribosyltransferase, also transfers the phospho-D-ribosyl group from nicotinate D-ribonucleotide to 5,6-dimethylbenzimidazole, but shows no activity with 4-methylphenol or phenol.

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


1. Chan, C.H. and Escalante-Semerena, J.C. ArsAB, a novel enzyme from Sporomusa ovata activates phenolic bases for adenosylcobamide biosynthesis. Mol. Microbiol. 81 (2011) 952-967. [PMID: 21696461]

[EC created 2013]

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