Catalyzes the phosphorylation of nicotinamide riboside (NR) and nicotinic acid riboside (NaR) to form nicotinamide mononucleotide (NMN) and nicotinic acid mononucleotide (NaMN). Reduces laminin matrix deposition and cell adhesion to laminin, but not to fibronectin. Involved in the regulation of PXN at the protein level and of PXN tyrosine phosphorylation. May play a role in the regulation of terminal myogenesis. ATP + beta-nicotinamide D-riboside = ADP + beta-nicotinamide D-ribonucleotide + H(+) ATP + beta-D-ribosylnicotinate = ADP + H(+) + nicotinate beta-D-ribonucleotide Cofactor biosynthesis; NAD(+) biosynthesis. Monomer (By similarity). Interacts with ITGB1 alone or when associated with alpha-7, but not with alpha-5. Predominantly expressed in skeletal muscle and, at a much lower level, in the heart (at protein level). No expression in brain, kidney, liver, lung, pancreas nor placenta. Down-regulated during myoblast differentiation. Belongs to the uridine kinase family. NRK subfamily. Aberrant splicing.