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| [[Image:1bag.gif|left|200px]]<br /><applet load="1bag" size="450" color="white" frame="true" align="right" spinBox="true"
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| caption="1bag, resolution 2.5Å" />
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| '''ALPHA-AMYLASE FROM BACILLUS SUBTILIS COMPLEXED WITH MALTOPENTAOSE'''<br />
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| ==Overview== | | ==ALPHA-AMYLASE FROM BACILLUS SUBTILIS COMPLEXED WITH MALTOPENTAOSE== |
| The X-ray crystal structure of a catalytic-site mutant EQ208, [Glu208-->Gln] of alpha-amylase from Bacillus subtilis cocrystallized with, maltopentaose (G5) and acarbose has been determined by multiple, isomorphous replacement at 2.5 A resolution. Restrained crystallographic, refinement has resulted in an R-factor of 19.8% in the 7.0 to 2.5 A, resolution range. EQ208 consists of three domains containing a, (beta/alpha)8-barrel as observed in other alpha-amylases. Clear connected, density corresponding to a pentasaccharide was observed, which was, considered as the G5 molecule based on the high affinity of EQ208 for G5, that could replace pre-bound acarbose or a possible transglycosylation, product of acarbose. The conformation around the third, alpha-(1,4)-glucosidic bond makes a sharp turn, allowing the substrate to, fit into the L-shaped cleft. Aromatic residues build the walls of the, substrate binding cleft and leucine residues form the inner curvature of, the cleft. The amide nitrogen of Gln208 forms a hydrogen bond with the, glucosidic oxygen in the scissile bond between Glc3 and Glc4 (Glc1 is the, non-reducing end glucose residue of the substrate). This hydrogen-bonding, manner may correspond to that of the protonated state of Glu208 in the, initial kinetic complex between wild-type enzyme and substrate. The amide, oxygen of Gln208 is anchored by two hydrogen bonds with Ala177 and a water, molecule, assisting to make the amide proton point precisely to the place, of the catalytic attack. The carboxyl oxygen atoms of the other, catalytic-site residues Asp176 and Asp269 form hydrogen bonds with the, oxygen atoms of Glc3. The carboxyl group of Asp176 has non-bonded contacts, to the anomeric carbon atom and to the endocyclic oxygen atom of Glc3., These results suggest that Glu208 acts as a general acid and Asp176 as a, general base. Glc3 forms seven hydrogen bonds with the surrounding protein, groups and a stacking interaction with Tyr62, which is consistent with the, fact that Glc3 has the lowest mean thermal factor of 13.2 A2 among the, five sugar residues. Three calcium ions are found, one of which is, positioned near the substrate binding site as found in other, alpha-amylases and could contribute to stabilization of the structure of, the active site.
| | <StructureSection load='1bag' size='340' side='right'caption='[[1bag]], [[Resolution|resolution]] 2.50Å' scene=''> |
| | == Structural highlights == |
| | <table><tr><td colspan='2'>[[1bag]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BAG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BAG FirstGlance]. <br> |
| | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.5Å</td></tr> |
| | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene></td></tr> |
| | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1bag FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bag OCA], [https://pdbe.org/1bag PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bag RCSB], [https://www.ebi.ac.uk/pdbsum/1bag PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bag ProSAT]</span></td></tr> |
| | </table> |
| | == Function == |
| | [https://www.uniprot.org/uniprot/AMY_BACSU AMY_BACSU] |
| | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] |
| | Check<jmol> |
| | <jmolCheckbox> |
| | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ba/1bag_consurf.spt"</scriptWhenChecked> |
| | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> |
| | <text>to colour the structure by Evolutionary Conservation</text> |
| | </jmolCheckbox> |
| | </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=1bag ConSurf]. |
| | <div style="clear:both"></div> |
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| ==About this Structure== | | ==See Also== |
| 1BAG is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with CA as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [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] Known structural/functional Sites: <scene name='pdbsite=CA1:Ca Binding Site'>CA1</scene>, <scene name='pdbsite=CA2:Ca Binding Site (Adventitious)'>CA2</scene> and <scene name='pdbsite=CA3:Ca Binding Site (Adventitious)'>CA3</scene>. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1BAG OCA].
| | *[[Amylase 3D structures|Amylase 3D structures]] |
| | | __TOC__ |
| ==Reference==
| | </StructureSection> |
| Crystal structure of a catalytic-site mutant alpha-amylase from Bacillus subtilis complexed with maltopentaose., Fujimoto Z, Takase K, Doui N, Momma M, Matsumoto T, Mizuno H, J Mol Biol. 1998 Mar 27;277(2):393-407. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9514750 9514750]
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| [[Category: Alpha-amylase]]
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| [[Category: Bacillus subtilis]] | | [[Category: Bacillus subtilis]] |
| [[Category: Single protein]] | | [[Category: Large Structures]] |
| [[Category: Doui, N.]] | | [[Category: Doui N]] |
| [[Category: Fujimoto, Z.]] | | [[Category: Fujimoto Z]] |
| [[Category: Mizuno, H.]] | | [[Category: Mizuno H]] |
| [[Category: Takase, K.]] | | [[Category: Takase K]] |
| [[Category: CA]]
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| [[Category: alpha-amylase]]
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| [[Category: bacillus subtilis]]
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| [[Category: catalytic-site mutant]]
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| [[Category: maltopentaose]]
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| ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Dec 18 14:24:52 2007''
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