ID XGPT_BUCAI Reviewed; 158 AA. AC P57339; DT 01-DEC-2000, integrated into UniProtKB/Swiss-Prot. DT 01-DEC-2000, sequence version 1. DT 30-NOV-2010, entry version 66. DE RecName: Full=Xanthine phosphoribosyltransferase; DE EC=2.4.2.22; DE AltName: Full=Xanthine-guanine phosphoribosyltransferase; DE Short=XGPRT; GN Name=gpt; OrderedLocusNames=BU251; OS Buchnera aphidicola subsp. Acyrthosiphon pisum (Acyrthosiphon pisum OS symbiotic bacterium). OC Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacteriales; OC Enterobacteriaceae; Buchnera. OX NCBI_TaxID=118099; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=Tokyo 1998; RX MEDLINE=20445173; PubMed=10993077; DOI=10.1038/35024074; RA Shigenobu S., Watanabe H., Hattori M., Sakaki Y., Ishikawa H.; RT "Genome sequence of the endocellular bacterial symbiont of aphids RT Buchnera sp. APS."; RL Nature 407:81-86(2000). CC -!- FUNCTION: Acts on guanine, xanthine and to a lesser extent CC hypoxanthine (By similarity). CC -!- CATALYTIC ACTIVITY: XMP + diphosphate = 5-phospho-alpha-D-ribose CC 1-diphosphate + xanthine. CC -!- COFACTOR: Binds 1 magnesium ion per subunit (By similarity). CC -!- PATHWAY: Purine metabolism; XMP biosynthesis via salvage pathway; CC XMP from xanthine: step 1/1. CC -!- SUBUNIT: Homotetramer (By similarity). CC -!- SUBCELLULAR LOCATION: Cell membrane; Peripheral membrane protein CC (By similarity). CC -!- SIMILARITY: Belongs to the purine/pyrimidine CC phosphoribosyltransferase family. XGPT subfamily. CC -!- SEQUENCE CAUTION: CC Sequence=BAB12961.1; Type=Erroneous initiation; CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; BA000003; BAB12961.1; ALT_INIT; Genomic_DNA. DR RefSeq; NP_240075.2; NC_002528.1. DR ProteinModelPortal; P57339; -. DR SMR; P57339; 3-151. DR EnsemblBacteria; EBBUCT00000002828; EBBUCP00000002604; EBBUCG00000002828. DR GeneID; 1109690; -. DR GenomeReviews; BA000003_GR; BU251. DR KEGG; buc:BU251; -. DR HOGENOM; HBG503428; -. DR OMA; LVDTFIT; -. DR PhylomeDB; P57339; -. DR ProtClustDB; PRK09177; -. DR BioCyc; BSP107806:BU251-MONOMER; -. DR GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell. DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW. DR GO; GO:0000310; F:xanthine phosphoribosyltransferase activity; IEA:EC. DR GO; GO:0006166; P:purine ribonucleoside salvage; IEA:UniProtKB-KW. DR HAMAP; MF_01903; XGPRT; 1; -. DR InterPro; IPR000836; PRibTrfase. DR Pfam; PF00156; Pribosyltran; 1. DR PROSITE; PS00103; PUR_PYR_PR_TRANSFER; 1. PE 3: Inferred from homology; KW Cell membrane; Complete proteome; Glycosyltransferase; Magnesium; KW Membrane; Metal-binding; Purine salvage; Transferase. FT CHAIN 1 158 Xanthine phosphoribosyltransferase. FT /FTId=PRO_0000139660. FT REGION 38 39 5-phosphoribose 1-diphosphate binding (By FT similarity). FT REGION 94 98 5-phosphoribose 1-diphosphate binding (By FT similarity). FT METAL 91 91 Magnesium (By similarity). FT BINDING 94 94 Xanthine (By similarity). FT BINDING 137 137 Xanthine; via amide nitrogen and carbonyl FT oxygen (By similarity). SQ SEQUENCE 158 AA; 18064 MW; 2B40B2A98EAABF28 CRC64; MSEKYIVTWD MLQIHTRKLA NRLVKKIHSW NGIIAVSRGG LVPSALLARE LGLRCVDTVC IESYNYDCLK ENRKIIKKAE GNGEKIIVID DLVDTGGTAK IIRKLYPKAC FVTIFAKPMG RSLVDNYIID IPQNVWIEQP WDMSISYIPP LIQNYKIK //