View source for 2wkg


==Nostoc punctiforme Debranching Enzyme (NPDE)(Native form)==
<StructureSection load='2wkg' size='340' side='right'caption='[[2wkg]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2wkg]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Nostoc_punctiforme_PCC_73102 Nostoc punctiforme PCC 73102]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2WKG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2WKG 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]] 3&#8491;</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=2wkg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2wkg OCA], [https://pdbe.org/2wkg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2wkg RCSB], [https://www.ebi.ac.uk/pdbsum/2wkg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2wkg ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/B2IUW9_NOSP7 B2IUW9_NOSP7] 
== 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/wk/2wkg_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=2wkg ConSurf].
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== Publication Abstract from PubMed ==
The debranching enzyme Nostoc punctiforme debranching enzyme (NPDE) from the cyanobacterium Nostoc punctiforme (PCC73102) hydrolyzes the alpha-1,6 glycosidic linkages of malto-oligosaccharides. Despite its high homology to cyclodextrin/pullulan (CD/PUL)-hydrolyzing enzymes from glycosyl hydrolase 13 family (GH-13), NPDE exhibits a unique catalytic preference for longer malto-oligosaccharides (&gt;G8), performing hydrolysis without the transgylcosylation or CD-hydrolyzing activities of other GH-13 enzymes. To investigate the molecular basis for the property of NPDE, we determined the structure of NPDE at 2.37-A resolution. NPDE lacks the typical N-terminal domain of other CD/PUL-hydrolyzing enzymes and forms an elongated dimer in a head-to-head configuration. The unique orientation of residues 25-55 in NPDE yields an extended substrate binding groove from the catalytic center to the dimeric interface. The substrate binding groove with a lengthy cavity beyond the -1 subsite exhibits a suitable architecture for binding longer malto-oligosaccharides (&gt;G8). These structural results may provide a molecular basis for the substrate specificity and catalytic function of this cyanobacterial enzyme, distinguishing it from the classical neopullulanases and CD/PUL-hydrolyzing enzymes. Proteins 2009. (c) 2009 Wiley-Liss, Inc.

Structural features of the Nostoc punctiforme debranching enzyme reveal the basis of its mechanism and substrate specificity.,Dumbrepatil AB, Choi JH, Park JT, Kim MJ, Kim TJ, Woo EJ, Park KH Proteins. 2009 Jul 20. PMID:19768689<ref>PMID:19768689</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: Nostoc punctiforme PCC 73102]]
[[Category: Choi JH]]
[[Category: Dumbrepatil AB]]
[[Category: Park KH]]
[[Category: Song HN]]
[[Category: Woo EJ]]