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1mxg

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[[Image:1mxg.gif|left|200px]]
 
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{{Structure
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==Crystal Structure of a (Ca,Zn)-dependent alpha-amylase from the hyperthermophilic archaeon Pyrococcus woesei in complex with acarbose==
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|PDB= 1mxg |SIZE=350|CAPTION= <scene name='initialview01'>1mxg</scene>, resolution 1.6&Aring;
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<StructureSection load='1mxg' size='340' side='right'caption='[[1mxg]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND= <scene name='pdbligand=ACR:ACARBOSE'>ACR</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EOH:ETHANOL'>EOH</scene>, <scene name='pdbligand=ETE:2-{2-[2-2-(METHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHANOL'>ETE</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene>
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<table><tr><td colspan='2'>[[1mxg]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Pyrococcus_woesei Pyrococcus woesei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MXG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MXG FirstGlance]. <br>
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Alpha-amylase Alpha-amylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.1 3.2.1.1] </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]] 1.6&#8491;</td></tr>
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|GENE=
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AC1:6-METHYL-5-(4,5,6-TRIHYDROXY-3-HYDROXYMETHYL-CYCLOHEX-2-ENYLAMINO)-TETRAHYDRO-PYRAN-2,3,4-TRIOL'>AC1</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EOH:ETHANOL'>EOH</scene>, <scene name='pdbligand=ETE:2-{2-[2-2-(METHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHANOL'>ETE</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PRD_900007:alpha-acarbose'>PRD_900007</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=1mxg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mxg OCA], [https://pdbe.org/1mxg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mxg RCSB], [https://www.ebi.ac.uk/pdbsum/1mxg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mxg ProSAT]</span></td></tr>
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|RELATEDENTRY=[[1mwo|1MWO]], [[1mxd|1MXD]]
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</table>
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1mxg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mxg OCA], [http://www.ebi.ac.uk/pdbsum/1mxg PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1mxg RCSB]</span>
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== Function ==
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}}
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[https://www.uniprot.org/uniprot/Q7LYT7_PYRWO Q7LYT7_PYRWO]
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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/mx/1mxg_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=1mxg ConSurf].
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<div style="clear:both"></div>
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'''Crystal Strucutre of a (Ca,Zn)-dependent alpha-amylase from the hyperthermophilic archaeon Pyrococcus woesei in complex with acarbose'''
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==See Also==
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*[[Amylase 3D structures|Amylase 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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The crystal structure of the alpha-amylase from the hyperthermophilic archaeon Pyrococcus woesei was solved in the presence of three inhibitors: acarbose, Tris, and zinc. In the absence of exogenous metals, this alpha-amylase bound 1 and 4 molar eq of zinc and calcium, respectively. The structure reveals a novel, activating, two-metal (Ca,Zn)-binding site and a second inhibitory zinc-binding site that is found in the -1 sugar-binding pocket within the active site. The data resolve the apparent paradox between the zinc requirement for catalytic activity and its strong inhibitory effect when added in molar excess. They provide a rationale as to why this alpha-amylase, in contrast to commercially available alpha-amylases, does not require the addition of metal ions for full catalytic activity, suggesting it as an ideal target to maximize the efficiency of industrial processes like liquefaction of starch.
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[[Category: Large Structures]]
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==About this Structure==
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1MXG is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Pyrococcus_woesei Pyrococcus woesei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MXG OCA].
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==Reference==
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Differential regulation of a hyperthermophilic alpha-amylase with a novel (Ca,Zn) two-metal center by zinc., Linden A, Mayans O, Meyer-Klaucke W, Antranikian G, Wilmanns M, J Biol Chem. 2003 Mar 14;278(11):9875-84. Epub 2002 Dec 12. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12482867 12482867]
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[[Category: Alpha-amylase]]
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[[Category: Pyrococcus woesei]]
[[Category: Pyrococcus woesei]]
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[[Category: Single protein]]
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[[Category: Antranikian G]]
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[[Category: Antranikian, G.]]
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[[Category: Linden A]]
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[[Category: Linden, A.]]
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[[Category: Mayans O]]
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[[Category: Mayans, O.]]
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[[Category: Meyer-Klaucke W]]
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[[Category: Meyer-Klaucke, W.]]
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[[Category: Wilmanns M]]
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[[Category: Wilmanns, M.]]
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[[Category: (beta/alpha)8-barrel]]
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[[Category: alpha-amylase]]
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[[Category: family 13 glycosyl hydrolase]]
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[[Category: hyperthermostable]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:22:29 2008''
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Current revision

Crystal Structure of a (Ca,Zn)-dependent alpha-amylase from the hyperthermophilic archaeon Pyrococcus woesei in complex with acarbose

PDB ID 1mxg

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