MetaCyc Pathway: xanthine and xanthosine salvage in Rhodospirillum rubrum S1H

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Purine-nucleoside phosphorylase:
xanthosine + phosphate→xanthine + α-D-ribose-1-phosphate (EC 2.4.2.1)
Rru_A0046
Xanthine phosphoribosyltransferase (in reverse):
xanthine + 5-phospho-α-D-ribose 1-diphosphate→XMP + diphosphate (EC 2.4.2.22)
Rru_A1955
Rru_A3319

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Candidate genes for each reaction are identified from best hits to MetaCyc; by matching EC numbers (which are assigned by TIGRFam, SEED, or best hits to KEGG); or by matching SEED roles to KEGG reactions to MetaCyc reactions. See the "Protein" tab of each gene for more information