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xanthine phosphoribosyltransferase
This HMM represent a xanthine-specific phosphoribosyltransferase of Bacillus subtilis and closely related proteins from other species, mostly from other Gram-positive bacteria. The adjacent gene is a xanthine transporter; B. subtilis can import xanthine for the purine salvage pathway or for catabolism to obtain nitrogen.
xanthine phosphoribosyltransferase converts the preformed base xanthine, a product of nucleic acid breakdown, to xanthosine 5'-monophosphate (XMP), so it can be reused for RNA or DNA synthesis
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