1byc

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(New page: 200px<br /><applet load="1byc" size="450" color="white" frame="true" align="right" spinBox="true" caption="1byc, resolution 2.2&Aring;" /> '''CRYSTAL STRUCTURES OF...)
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[[Image:1byc.gif|left|200px]]<br /><applet load="1byc" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1byc, resolution 2.2&Aring;" />
 
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'''CRYSTAL STRUCTURES OF SOYBEAN BETA-AMYLASE REACTED WITH BETA-MALTOSE AND MALTAL: ACTIVE SITE COMPONENTS AND THEIR APPARENT ROLE IN CATALYSIS'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURES OF SOYBEAN BETA-AMYLASE REACTED WITH BETA-MALTOSE AND MALTAL: ACTIVE SITE COMPONENTS AND THEIR APPARENT ROLE IN CATALYSIS==
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The crystal structures of catalytically competent soybean beta-amylase, unliganded and bathed with small substrates (beta-maltose, maltal), were, determined at 1.9-2.2-A resolution. Two molecules of beta-maltose, substrate bind to the protein in tandem, with some maltotetraose enzymic, condensation product sharing the same binding sites. The beta-amylase, soaked with maltal shows a similar arrangement of two bound molecules of, 2-deoxymaltose, the enzymic hydration product. In each case the, nonreducing ends of the saccharide ligands are oriented toward the base of, the protein's active site pocket. The catalytic center, located between, the bound disaccharides and found deeper in the pocket than where the, inhibitor alpha-cyclodextrin binds, is characterized by the presence of, oppositely disposed carboxyl groups of two conserved glutamic acid, residues. The OE2 carboxyl of Glu 186 is below the plane of the, penultimate glucose residue (Glc 2) of bound maltotetraose, 2.6 A from the, oxygen atom of that ligand's penultimate alpha-1,4-glucosidic linkage. The, OE2 carboxyl of Glu 380 lies above the plane of Glc 2, 2.8 A from the O-1, atom of the more deeply bound beta-maltose. Saccharide binding does not, alter the spatial coordinates of these two carboxyl groups or the overall, conformation of the 57-kDa protein. However, the saccharide complexes of, the active enzyme are associated with a significant (10 A) local, conformational change in a peptide segment of a loop (L3) that borders the, active site pocket.(ABSTRACT TRUNCATED AT 250 WORDS)
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<StructureSection load='1byc' size='340' side='right'caption='[[1byc]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1byc]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Glycine_max Glycine max]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BYC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BYC 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=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=1byc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1byc OCA], [https://pdbe.org/1byc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1byc RCSB], [https://www.ebi.ac.uk/pdbsum/1byc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1byc ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/AMYB_SOYBN AMYB_SOYBN]
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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/by/1byc_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=1byc 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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1BYC is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/ ] with GLC and SO4 as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Beta-amylase Beta-amylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.2 3.2.1.2] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1BYC OCA].
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*[[Amylase 3D structures|Amylase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Crystal structures of soybean beta-amylase reacted with beta-maltose and maltal: active site components and their apparent roles in catalysis., Mikami B, Degano M, Hehre EJ, Sacchettini JC, Biochemistry. 1994 Jun 28;33(25):7779-87. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8011643 8011643]
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[[Category: Glycine max]]
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[[Category: Beta-amylase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Degano M]]
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[[Category: Degano, M.]]
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[[Category: Hehre EJ]]
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[[Category: Hehre, E.J.]]
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[[Category: Mikami B]]
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[[Category: Mikami, B.]]
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[[Category: Sacchettini JC]]
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[[Category: Sacchettini, J.C.]]
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[[Category: GLC]]
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[[Category: SO4]]
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[[Category: hydrolase(o-glycosyl)]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 12:01:23 2007''
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Current revision

CRYSTAL STRUCTURES OF SOYBEAN BETA-AMYLASE REACTED WITH BETA-MALTOSE AND MALTAL: ACTIVE SITE COMPONENTS AND THEIR APPARENT ROLE IN CATALYSIS

PDB ID 1byc

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