uridine phosphorylase activity Catalysis of the reaction: uridine + phosphate = uracil + alpha-D-ribose 1-phosphate. EC:2.4.2.3 GO:0004850 MetaCyc:URPHOS-RXN RHEA:24391 Reactome:REACT_101041 Reactome:REACT_101427 Reactome:REACT_103383 Reactome:REACT_109044 Reactome:REACT_109074 Reactome:REACT_109460 Reactome:REACT_110273 Reactome:REACT_110888 Reactome:REACT_1812 Reactome:REACT_2200 Reactome:REACT_30745 Reactome:REACT_32075 Reactome:REACT_33167 Reactome:REACT_77223 Reactome:REACT_84353 Reactome:REACT_88039 Reactome:REACT_90697 Reactome:REACT_91776 Reactome:REACT_91985 Reactome:REACT_94957 Reactome:REACT_99312 Reactome:REACT_99510 Reactome:REACT_99604 Reactome:REACT_99702 UPH UPase activity UrdPase activity molecular_function pyrimidine phosphorylase activity uridine:phosphate alpha-D-ribosyltransferase activity