Reaction catalyzed by nicotinate-nucleotide-dimethylbenzimidazole phosphoribosyltransferase (2.4.2.21)

		+			=			+
	beta-nicotinate D-ribonucleotide	+		5,6-dichlorobenzimidazole	=		nicotinate	+		N1-(5-phospho-alpha-D-ribosyl)-5,6-dichlorobenzimidazole