1fxu

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[[Image:1fxu.gif|left|200px]]
 
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==PURINE NUCLEOSIDE PHOSPHORYLASE FROM CALF SPLEEN IN COMPLEX WITH N(7)-ACYCLOGUANOSINE INHIBITOR AND A PHOSPHATE ION==
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The line below this paragraph, containing "STRUCTURE_1fxu", creates the "Structure Box" on the page.
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<StructureSection load='1fxu' size='340' side='right'caption='[[1fxu]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1fxu]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FXU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1FXU FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GU7:2-AMINO-7-[2-(2-HYDROXY-1-HYDROXYMETHYL-ETHYLAMINO)-ETHYL]-1,7-DIHYDRO-PURIN-6-ONE'>GU7</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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{{STRUCTURE_1fxu| PDB=1fxu | SCENE= }}
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1fxu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fxu OCA], [https://pdbe.org/1fxu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1fxu RCSB], [https://www.ebi.ac.uk/pdbsum/1fxu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1fxu ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/PNPH_BOVIN PNPH_BOVIN] The purine nucleoside phosphorylases catalyze the phosphorolytic breakdown of the N-glycosidic bond in the beta-(deoxy)ribonucleoside molecules, with the formation of the corresponding free purine bases and pentose-1-phosphate.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/fx/1fxu_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1fxu ConSurf].
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<div style="clear:both"></div>
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'''PURINE NUCLEOSIDE PHOSPHORYLASE FROM CALF SPLEEN IN COMPLEX WITH N(7)-ACYCLOGUANOSINE INHIBITOR AND A PHOSPHATE ION'''
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==See Also==
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*[[Purine nucleoside phosphorylase 3D structures|Purine nucleoside phosphorylase 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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The calf spleen purine nucleoside phosphorylase (PNP) ternary complex with an N(7)-acycloguanosine inhibitor and a phosphate ion has been crystallized in the cubic space group P2(1)3, with unit-cell parameter a = 94.11 A and one monomer per asymmetric unit. X-ray diffraction data were collected using synchrotron radiation (Station X31, EMBL Outstation, DESY, Hamburg). The crystal structure was refined to a resolution of 2.2 A and R and R(free) values of 17.5 and 24.5%, respectively. The acyclonucleoside inhibitor is bound in the active site in an inverted ('upside-down') orientation of the purine base compared with natural substrates. The side chain of Asp243 forms two hydrogen bonds with the base ring: N(delta) donates a hydrogen to N(3) and O(delta) accepts a hydrogen from the guanine N(2)-amino group. N(1)--H of the base is hydrogen bonded to O(epsilon) of Glu201, while N(9) accepts a hydrogen bond from Thr242 O(gamma). In addition, a water molecule (W417) bridges the N(2)-amino group of the base and O(epsilon) of Glu201. In the phosphate-binding site, a phosphate ion is bound to Ser33, His64, Arg84, His86, Ala116 and Ser220. The acyclic chain of the N(7)-acycloguanosine inhibitor is in a folded conformation and together with a water molecule (W388) occupies the pentose-binding site, with possible hydrogen bonds to Tyr88 O(eta) and His257 N(delta 1). This new binding mode fully accounts for the previously observed substrate properties of 7-beta-D-ribofuranosides of hypoxanthine and guanine. It also provides a new starting point for the design of inhibitors of PNP for therapeutic and other applications.
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==About this Structure==
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1FXU is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FXU OCA].
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==Reference==
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Calf spleen purine nucleoside phosphorylase: structure of its ternary complex with an N(7)-acycloguanosine inhibitor and a phosphate anion., Luic M, Koellner G, Shugar D, Saenger W, Bzowska A, Acta Crystallogr D Biol Crystallogr. 2001 Jan;57(Pt 1):30-6. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11134924 11134924]
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[[Category: Bos taurus]]
[[Category: Bos taurus]]
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[[Category: Purine-nucleoside phosphorylase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Bzowska A]]
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[[Category: Bzowska, A.]]
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[[Category: Koellner G]]
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[[Category: Koellner, G.]]
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[[Category: Luic M]]
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[[Category: Luic, M.]]
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[[Category: Saenger W]]
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[[Category: Saenger, W.]]
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[[Category: Shugar D]]
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[[Category: Shugar, D.]]
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[[Category: Glycosyltransferase]]
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[[Category: Nucleoside phosphorylase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 16:53:09 2008''
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Current revision

PURINE NUCLEOSIDE PHOSPHORYLASE FROM CALF SPLEEN IN COMPLEX WITH N(7)-ACYCLOGUANOSINE INHIBITOR AND A PHOSPHATE ION

PDB ID 1fxu

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