CMP, UMP cytidine, uridine cytidine or uridine + ATP => CMP or UMP + ADP [UCK2] Cytosolic uridine-cytidine kinase 2 (UCK2) catalyzes the reactions of cytidine or uridine with ATP to form CMP or UMP and ADP (Greenberg et al. 1977; Van Rompay et al. 2001). Crystallographic data show the enzyme to be a tetramer (Suzuki et al. 2004). When it is expressed as a fusion construct with green fluorescent protein, the protein localizes primarily to the cytosol of transfected CHO cells (Van Rompay et al. 2003). Pubmed11306702 Pubmed14609716 Pubmed15130468 Pubmed195585 Reactome Database ID Release 43109903 Reactome, http://www.reactome.org ReactomeREACT_2162