1did

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(New page: 200px<br /><applet load="1did" size="450" color="white" frame="true" align="right" spinBox="true" caption="1did, resolution 2.5&Aring;" /> '''OBSERVATIONS OF REACT...)
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[[Image:1did.jpg|left|200px]]<br /><applet load="1did" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1did, resolution 2.5&Aring;" />
 
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'''OBSERVATIONS OF REACTION INTERMEDIATES AND THE MECHANISM OF ALDOSE-KETOSE INTERCONVERSION BY D-XYLOSE ISOMERASE'''<br />
 
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==Overview==
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==OBSERVATIONS OF REACTION INTERMEDIATES AND THE MECHANISM OF ALDOSE-KETOSE INTERCONVERSION BY D-XYLOSE ISOMERASE==
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Crystallographic studies of D-xylose isomerase (D-xylose ketol-isomerase, EC 5.3.1.5) incubated to equilibrium with substrate/product mixtures of, xylose and xylulose show electron density for a bound intermediate. The, accumulation of this bound intermediate shows that the mechanism is a, non-Michaelis type. Carrell et al. [Carrell, H. L., Glusker, J. P., Burger, V., Manfre, F., Tritsch, D. &amp; Biellmann, J.-F. (1989) Proc. Natl., Acad. Sci. USA 86, 4440-4444] and the present authors studied crystals of, the enzyme-substrate complex under different conditions and made different, interpretations of the substrate density, leading to different conclusions, about the enzyme mechanism. All authors agree that the bound intermediate, of the sugar is in an open-chain form. It is suggested that the, higher-temperature study of Carrell et al. may have produced an, equilibrium of multiple states, whose density fits poorly to the, open-chain substrate, and led to incorrect interpretation. The two groups, also bound different closed-ring sugar analogues to the enzyme, but these, analogues bind differently. A possible explanation consistent with all the, data is that the enzyme operates by a hydride shift mechanism.
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<StructureSection load='1did' size='340' side='right'caption='[[1did]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1did]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Arthrobacter_sp._NRRL_B3728 Arthrobacter sp. NRRL B3728]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DID OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1DID 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]] 2.5&#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=DIG:2,5-DIDEOXY-2,5-IMINO-D-GLUCITOL'>DIG</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</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=1did FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1did OCA], [https://pdbe.org/1did PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1did RCSB], [https://www.ebi.ac.uk/pdbsum/1did PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1did ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/XYLA_ARTS7 XYLA_ARTS7]
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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/di/1did_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=1did ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1DID is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Arthrobacter_sp. Arthrobacter sp.] with DIG and MN as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Xylose_isomerase Xylose isomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.3.1.5 5.3.1.5] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1DID OCA].
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*[[D-xylose isomerase 3D structures|D-xylose isomerase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Observations of reaction intermediates and the mechanism of aldose-ketose interconversion by D-xylose isomerase., Collyer CA, Blow DM, Proc Natl Acad Sci U S A. 1990 Feb;87(4):1362-6. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=2304904 2304904]
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[[Category: Arthrobacter sp. NRRL B3728]]
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[[Category: Arthrobacter sp.]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Blow DM]]
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[[Category: Xylose isomerase]]
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[[Category: Collyer CA]]
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[[Category: Blow, D.M.]]
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[[Category: Goldberg JD]]
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[[Category: Collyer, C.A.]]
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[[Category: Goldberg, J.D.]]
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[[Category: DIG]]
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[[Category: MN]]
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[[Category: isomerase(intramolecular oxidoreductse)]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 13:18:00 2007''
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OBSERVATIONS OF REACTION INTERMEDIATES AND THE MECHANISM OF ALDOSE-KETOSE INTERCONVERSION BY D-XYLOSE ISOMERASE

PDB ID 1did

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