View source for 1izj


==Thermoactinomyces vulgaris R-47 alpha-amylase 1 mutant enzyme f313a==
<StructureSection load='1izj' size='340' side='right'caption='[[1izj]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1izj]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermoactinomyces_vulgaris Thermoactinomyces vulgaris]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IZJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1IZJ 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]] 2.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</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=1izj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1izj OCA], [https://pdbe.org/1izj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1izj RCSB], [https://www.ebi.ac.uk/pdbsum/1izj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1izj ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/NEPU1_THEVU NEPU1_THEVU] Endohydrolysis of 1,4-alpha-glucosidic linkages in pullulan to form panose. Also hydrolyzes cyclodextrins.
== 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/iz/1izj_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=1izj ConSurf].
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== Publication Abstract from PubMed ==
Thermoactinomyces vulgaris R-47 produces two alpha-amylases, TVAI and TVAII, differing in substrate specificity from each other. TVAI favors high-molecular-weight substrates like starch, and scarcely hydrolyzes cyclomaltooligosaccharides (cyclodextrins) with a small cavity. TVAII favors low-molecular-weight substrates like oligosaccharides, and can efficiently hydrolyze cyclodextrins with various sized cavities. To understand the relationship between the structure and substrate specificity of these enzymes, we precisely examined the roles of key residues for substrate recognition by X-ray structural and kinetic parameter analyses of mutant enzymes and successfully obtained mutants in which the substrate specificity of each enzyme is partially converted into that of another.

Mutual conversion of substrate specificities of Thermoactinomyces vulgaris R-47 alpha-amylases TVAI and TVAII by site-directed mutagenesis.,Ohtaki A, Iguchi A, Mizuno M, Tonozuka T, Sakano Y, Kamitori S Carbohydr Res. 2003 Jul 22;338(15):1553-8. PMID:12860426<ref>PMID:12860426</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Amylase 3D structures|Amylase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Thermoactinomyces vulgaris]]
[[Category: Iguchi A]]
[[Category: Kamitori S]]
[[Category: Mizuno M]]
[[Category: Ohtaki A]]
[[Category: Sakano Y]]
[[Category: Tonozuka T]]