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1g9t

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[[Image:1g9t.jpg|left|200px]]
 
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{{Structure
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==CRYSTAL STRUCTURE OF E.COLI HPRT-GMP COMPLEX==
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|PDB= 1g9t |SIZE=350|CAPTION= <scene name='initialview01'>1g9t</scene>, resolution 2.8&Aring;
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<StructureSection load='1g9t' size='340' side='right'caption='[[1g9t]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND= <scene name='pdbligand=5GP:GUANOSINE-5&#39;-MONOPHOSPHATE'>5GP</scene>, <scene name='pdbligand=N:ANY+5&#39;-MONOPHOSPHATE+NUCLEOTIDE'>N</scene>
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<table><tr><td colspan='2'>[[1g9t]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G9T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1G9T FirstGlance]. <br>
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Hypoxanthine_phosphoribosyltransferase Hypoxanthine phosphoribosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.8 2.4.2.8] </span>
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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]] 2.8&#8491;</td></tr>
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|GENE= HPT ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5GP:GUANOSINE-5-MONOPHOSPHATE'>5GP</scene>, <scene name='pdbligand=N:ANY+5-MONOPHOSPHATE+NUCLEOTIDE'>N</scene></td></tr>
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|DOMAIN=
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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=1g9t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g9t OCA], [https://pdbe.org/1g9t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1g9t RCSB], [https://www.ebi.ac.uk/pdbsum/1g9t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1g9t ProSAT]</span></td></tr>
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|RELATEDENTRY=[[1a97|1A97]], [[1g9s|1G9S]]
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</table>
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1g9t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g9t OCA], [http://www.ebi.ac.uk/pdbsum/1g9t PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1g9t RCSB]</span>
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== Function ==
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}}
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[https://www.uniprot.org/uniprot/HPRT_ECOLI HPRT_ECOLI] Acts preferentially on hypoxanthine; has very low activity towards guanine. Inactive towards xanthine.
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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/g9/1g9t_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=1g9t ConSurf].
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<div style="clear:both"></div>
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'''CRYSTAL STRUCTURE OF E.COLI HPRT-GMP COMPLEX'''
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==See Also==
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*[[Phosphoribosyltransferase 3D structures|Phosphoribosyltransferase 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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Crystal structures have been determined for free Escherichia coli hypoxanthine phosphoribosyltransferase (HPRT) (2.9 A resolution) and for the enzyme in complex with the reaction products, inosine 5'-monophosphate (IMP) and guanosine 5'-monophosphate (GMP) (2.8 A resolution). Of the known 6-oxopurine phosphoribosyltransferase (PRTase) structures, E. coli HPRT is most similar in structure to that of Tritrichomonas foetus HGXPRT, with a rmsd for 150 Calpha atoms of 1.0 A. Comparison of the free and product bound structures shows that the side chain of Phe156 and the polypeptide backbone in this vicinity move to bind IMP or GMP. A nonproline cis peptide bond, also found in some other 6-oxopurine PRTases, is observed between Leu46 and Arg47 in both the free and complexed structures. For catalysis to occur, the 6-oxopurine PRTases have a requirement for divalent metal ion, usually Mg(2+) in vivo. In the free structure, a Mg(2+) is coordinated to the side chains of Glu103 and Asp104. This interaction may be important for stabilization of the enzyme before catalysis. E. coli HPRT is unique among the known 6-oxopurine PRTases in that it exhibits a marked preference for hypoxanthine as substrate over both xanthine and guanine. The structures suggest that its substrate specificity is due to the modes of binding of the bases. In E. coli HPRT, the carbonyl oxygen of Asp163 would likely form a hydrogen bond with the 2-exocyclic nitrogen of guanine (in the HPRT-guanine-PRib-PP-Mg(2+) complex). However, hypoxanthine does not have a 2-exocyclic atom and the HPRT-IMP structure suggests that hypoxanthine is likely to occupy a different position in the purine-binding pocket.
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==About this Structure==
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1G9T is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G9T OCA].
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==Reference==
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Crystal structures of free, IMP-, and GMP-bound Escherichia coli hypoxanthine phosphoribosyltransferase., Guddat LW, Vos S, Martin JL, Keough DT, de Jersey J, Protein Sci. 2002 Jul;11(7):1626-38. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12070315 12070315]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Hypoxanthine phosphoribosyltransferase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Guddat LW]]
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[[Category: Guddat, L W.]]
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[[Category: Martin JL]]
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[[Category: Jersey, J de.]]
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[[Category: Vos S]]
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[[Category: Martin, J L.]]
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[[Category: De Jersey J]]
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[[Category: Vos, S.]]
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[[Category: Keough DT]]
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[[Category: keough, D T.]]
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[[Category: crystal structure]]
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[[Category: enzymology]]
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[[Category: phosphoribosyltransferase]]
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[[Category: protein chemistry]]
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[[Category: purine salvage]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:39:45 2008''
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Current revision

CRYSTAL STRUCTURE OF E.COLI HPRT-GMP COMPLEX

PDB ID 1g9t

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