1ucw

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(New page: 200px<br /><applet load="1ucw" size="450" color="white" frame="true" align="right" spinBox="true" caption="1ucw, resolution 2.2&Aring;" /> '''COMPLEX OF TRANSALDOL...)
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[[Image:1ucw.jpg|left|200px]]<br /><applet load="1ucw" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1ucw, resolution 2.2&Aring;" />
 
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'''COMPLEX OF TRANSALDOLASE WITH THE REDUCED SCHIFF-BASE INTERMEDIATE'''<br />
 
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==Overview==
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==COMPLEX OF TRANSALDOLASE WITH THE REDUCED SCHIFF-BASE INTERMEDIATE==
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Transaldolase catalyzes transfer of a dihydroxyacetone moiety from a, ketose donor to an aldose acceptor. During catalysis, a Schiff-base, intermediate between dihydroxyacetone and the epsilon-amino group of a, lysine residue at the active site of the enzyme is formed. This, Schiff-base intermediate has been trapped by reduction with potassium, borohydride, and the crystal structure of this complex has been determined, at 2.2 A resolution. The overall structures of the complex and the native, enzyme are very similar; formation of the intermediate induces no large, conformational changes. The dihydroxyacetone moiety is covalently linked, to the side chain of Lys 132 at the active site of the enzyme. The Cl, hydroxyl group of the dihydroxyacetone moiety forms hydrogen bonds to the, side chains of residues Asn 154 and Ser 176. The C3 hydroxyl group, interacts with the side chain of Asp 17 and Asn 35. Based on the crystal, structure of this complex a reaction mechanism for transaldolase is, proposed.
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<StructureSection load='1ucw' size='340' side='right'caption='[[1ucw]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1ucw]] 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=1UCW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1UCW 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]] 2.2&#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=LLY:NZ-(DICARBOXYMETHYL)LYSINE'>LLY</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=1ucw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ucw OCA], [https://pdbe.org/1ucw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ucw RCSB], [https://www.ebi.ac.uk/pdbsum/1ucw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ucw ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/TALB_ECOLI TALB_ECOLI] Transaldolase is important for the balance of metabolites in the pentose-phosphate pathway.[HAMAP-Rule:MF_00492]
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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/uc/1ucw_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=1ucw 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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Transaldolase catalyzes transfer of a dihydroxyacetone moiety from a ketose donor to an aldose acceptor. During catalysis, a Schiff-base intermediate between dihydroxyacetone and the epsilon-amino group of a lysine residue at the active site of the enzyme is formed. This Schiff-base intermediate has been trapped by reduction with potassium borohydride, and the crystal structure of this complex has been determined at 2.2 A resolution. The overall structures of the complex and the native enzyme are very similar; formation of the intermediate induces no large conformational changes. The dihydroxyacetone moiety is covalently linked to the side chain of Lys 132 at the active site of the enzyme. The Cl hydroxyl group of the dihydroxyacetone moiety forms hydrogen bonds to the side chains of residues Asn 154 and Ser 176. The C3 hydroxyl group interacts with the side chain of Asp 17 and Asn 35. Based on the crystal structure of this complex a reaction mechanism for transaldolase is proposed.
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==About this Structure==
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Crystal structure of the reduced Schiff-base intermediate complex of transaldolase B from Escherichia coli: mechanistic implications for class I aldolases.,Jia J, Schorken U, Lindqvist Y, Sprenger GA, Schneider G Protein Sci. 1997 Jan;6(1):119-24. PMID:9007983<ref>PMID:9007983</ref>
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1UCW is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/Transaldolase Transaldolase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.2.1.2 2.2.1.2] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1UCW 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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Crystal structure of the reduced Schiff-base intermediate complex of transaldolase B from Escherichia coli: mechanistic implications for class I aldolases., Jia J, Schorken U, Lindqvist Y, Sprenger GA, Schneider G, Protein Sci. 1997 Jan;6(1):119-24. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9007983 9007983]
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</div>
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[[Category: Escherichia coli]]
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<div class="pdbe-citations 1ucw" style="background-color:#fffaf0;"></div>
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[[Category: Single protein]]
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[[Category: Transaldolase]]
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[[Category: Jia, J.]]
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[[Category: Lindqvist, Y.]]
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[[Category: Schneider, G.]]
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[[Category: ketone residues]]
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[[Category: pentose shunt]]
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[[Category: transferase]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 04:01:43 2007''
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==See Also==
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*[[Transaldolase 3D structures|Transaldolase 3D structures]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Escherichia coli]]
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[[Category: Large Structures]]
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[[Category: Jia J]]
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[[Category: Lindqvist Y]]
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[[Category: Schneider G]]

Current revision

COMPLEX OF TRANSALDOLASE WITH THE REDUCED SCHIFF-BASE INTERMEDIATE

PDB ID 1ucw

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