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1wnt

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(New page: 200px<br /> <applet load="1wnt" size="450" color="white" frame="true" align="right" spinBox="true" caption="1wnt, resolution 2.30&Aring;" /> '''Strucutre of the te...)
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[[Image:1wnt.gif|left|200px]]<br />
 
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<applet load="1wnt" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1wnt, resolution 2.30&Aring;" />
 
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'''Strucutre of the tetrameric form of Human L-Xylulose Reductase'''<br />
 
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==Overview==
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==Structure of the tetrameric form of Human L-Xylulose Reductase==
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L-Xylulose reductase (XR) is a member of the short-chain, dehydrogenase/reductase (SDR) superfamily. In this study we report the, structure of the biological tetramer of human XR in complex with NADP(+), and a competitive inhibitor solved at 2.3 A resolution. A single subunit, of human XR is formed by a centrally positioned, seven-stranded, parallel, beta-sheet surrounded on either side by two arrays of three alpha-helices., Two helices located away from the main body of the protein form the, variable substrate-binding cleft, while the dinucleotide coenzyme-binding, motif is formed by a classical Rossmann fold. The tetrameric structure of, XR, which is held together via salt bridges formed by the guanidino group, of Arg203 from one monomer and the carboxylate group of the C-terminal, residue Cys244 from the neighboring monomer, explains the ability of human, XR to prevent the cold inactivation seen in the rodent forms of the, enzyme. The orientations of Arg203 and Cys244 are maintained by a network, of hydrogen bonds and main-chain interactions of Gln137, Glu238, Phe241, and Trp242. These interactions are similar to those defining the, quaternary structure of the closely related carbonyl reductase from mouse, lung. Molecular modeling and site-directed mutagenesis identified the, active site residues His146 and Trp191 as forming essential contacts with, inhibitors of XR. These results could provide a structural basis in the, design of potent and specific inhibitors for human XR.
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<StructureSection load='1wnt' size='340' side='right'caption='[[1wnt]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1wnt]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WNT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1WNT FirstGlance]. <br>
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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]] 2.3&#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=NAP:NADP+NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NAP</scene></td></tr>
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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=1wnt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1wnt OCA], [https://pdbe.org/1wnt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1wnt RCSB], [https://www.ebi.ac.uk/pdbsum/1wnt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1wnt ProSAT]</span></td></tr>
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</table>
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== Disease ==
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[https://www.uniprot.org/uniprot/DCXR_HUMAN DCXR_HUMAN] Note=The enzyme defect in pentosuria has been shown to involve L-xylulose reductase. Essential pentosuria is an inborn error of metabolism characterized by the excessive urinary excretion of the pentose L-xylulose.
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== Function ==
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[https://www.uniprot.org/uniprot/DCXR_HUMAN DCXR_HUMAN] Catalyzes the NADPH-dependent reduction of several pentoses, tetroses, trioses, alpha-dicarbonyl compounds and L-xylulose. Participates in the uronate cycle of glucose metabolism. May play a role in the water absorption and cellular osmoregulation in the proximal renal tubules by producing xylitol, an osmolyte, thereby preventing osmolytic stress from occurring in the renal tubules.
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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/wn/1wnt_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=1wnt ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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L-Xylulose reductase (XR) is a member of the short-chain dehydrogenase/reductase (SDR) superfamily. In this study we report the structure of the biological tetramer of human XR in complex with NADP(+) and a competitive inhibitor solved at 2.3 A resolution. A single subunit of human XR is formed by a centrally positioned, seven-stranded, parallel beta-sheet surrounded on either side by two arrays of three alpha-helices. Two helices located away from the main body of the protein form the variable substrate-binding cleft, while the dinucleotide coenzyme-binding motif is formed by a classical Rossmann fold. The tetrameric structure of XR, which is held together via salt bridges formed by the guanidino group of Arg203 from one monomer and the carboxylate group of the C-terminal residue Cys244 from the neighboring monomer, explains the ability of human XR to prevent the cold inactivation seen in the rodent forms of the enzyme. The orientations of Arg203 and Cys244 are maintained by a network of hydrogen bonds and main-chain interactions of Gln137, Glu238, Phe241, and Trp242. These interactions are similar to those defining the quaternary structure of the closely related carbonyl reductase from mouse lung. Molecular modeling and site-directed mutagenesis identified the active site residues His146 and Trp191 as forming essential contacts with inhibitors of XR. These results could provide a structural basis in the design of potent and specific inhibitors for human XR.
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==About this Structure==
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Structure of the tetrameric form of human L-Xylulose reductase: probing the inhibitor-binding site with molecular modeling and site-directed mutagenesis.,El-Kabbani O, Carbone V, Darmanin C, Ishikura S, Hara A Proteins. 2005 Aug 15;60(3):424-32. PMID:15906319<ref>PMID:15906319</ref>
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1WNT is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with NAP as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/L-xylulose_reductase L-xylulose reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.10 1.1.1.10] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1WNT OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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Structure of the tetrameric form of human L-Xylulose reductase: probing the inhibitor-binding site with molecular modeling and site-directed mutagenesis., El-Kabbani O, Carbone V, Darmanin C, Ishikura S, Hara A, Proteins. 2005 Aug 15;60(3):424-32. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15906319 15906319]
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</div>
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<div class="pdbe-citations 1wnt" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: L-xylulose reductase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Carbone V]]
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[[Category: Carbone, V.]]
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[[Category: Darmanin C]]
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[[Category: Darmanin, C.]]
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[[Category: El-Kabbani O]]
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[[Category: El-Kabbani, O.]]
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[[Category: Hara A]]
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[[Category: Hara, A.]]
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[[Category: Ishikura S]]
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[[Category: Ishikura, S.]]
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[[Category: NAP]]
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[[Category: 6 alpha helices]]
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[[Category: 7 stranded parallel beta sheets]]
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[[Category: dinucleotide co-enzyme binding motif]]
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[[Category: rossmann fold]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 12 19:52:44 2007''
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Current revision

Structure of the tetrameric form of Human L-Xylulose Reductase

PDB ID 1wnt

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