View source for 1ac0


==GLUCOAMYLASE, GRANULAR STARCH-BINDING DOMAIN COMPLEX WITH CYCLODEXTRIN, NMR, MINIMIZED AVERAGE STRUCTURE==
<StructureSection load='1ac0' size='340' side='right'caption='[[1ac0]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ac0]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Aspergillus_niger Aspergillus niger]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AC0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1AC0 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 1 model</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=PRD_900012:beta-cyclodextrin'>PRD_900012</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=1ac0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ac0 OCA], [https://pdbe.org/1ac0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ac0 RCSB], [https://www.ebi.ac.uk/pdbsum/1ac0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ac0 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/AMYG_ASPNG AMYG_ASPNG] 
== 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/ac/1ac0_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1ac0 ConSurf].
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== Publication Abstract from PubMed ==
BACKGROUND: Carbohydrate-binding domains are usually small and physically separate from the catalytic domains of hydrolytic enzymes. Glucoamylase 1 (G1) from Aspergillus niger, an enzyme used widely in the food and brewing industries, contains a granular starch binding domain (SBD) which is separated from the catalytic domain by a semi-rigid linker. The aim of this study was to determine how the SBD binds to starch, and thereby more generally to throw light on the role of carbohydrate-binding domains in the hydrolysis of insoluble polysaccharides. RESULTS: The solution structure of the SBD of A. niger G1 bound to beta-cyclodextrin (betaCD), a cyclic starch analogue, shows that the well-defined beta-sheet structure seen in the free SBD is maintained in the SBD-betaCD complex. The main differences between the free and bound states of the SBD are observed in loop regions, in or near the two starch-binding sites. The two binding sites, each of which binds one molecule of betaCD, are structurally different. Binding site 1 is small and accessible, and its structure changes very little upon ligand binding. Site 2 is longer and undergoes a significant structural change on binding. Part of this site comprises a flexible loop, which appears to allow the SBD to bind to starch strands in a range of orientations. CONCLUSIONS: The two starch-binding sites of the SBD probably differ functionally as well as structurally; site 1 probably acts as the initial starch recognition site, whereas site 2 is involved in specific recognition of appropriate regions of starch. The two starch strands are bound at approximately 90 degrees to each other. This may be functionally important, as it may force starch strands apart thus increasing the hydrolyzable surface, or alternatively it may localize the enzyme to noncrystalline (more hydrolyzable) areas of starch. The region of the SBD where the linker to the catalytic domain is attached is flexible, allowing the catalytic site to access a large surface area of the starch granules.

Solution structure of the granular starch binding domain of Aspergillus niger glucoamylase bound to beta-cyclodextrin.,Sorimachi K, Le Gal-Coeffet MF, Williamson G, Archer DB, Williamson MP Structure. 1997 May 15;5(5):647-61. PMID:9195884<ref>PMID:9195884</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Alpha-glucosidase 3D structures|Alpha-glucosidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Aspergillus niger]]
[[Category: Large Structures]]
[[Category: Archer DB]]
[[Category: Le Gal-Coeffet M-F]]
[[Category: Sorimachi K]]
[[Category: Williamson G]]
[[Category: Williamson MP]]