View source for 2fhb


==Crystal Structure Analysis of Klebsiella pneumoniae pullulanase complexed with maltose==
<StructureSection load='2fhb' size='340' side='right'caption='[[2fhb]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2fhb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Klebsiella_aerogenes Klebsiella aerogenes]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FHB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2FHB FirstGlance]. <br>
</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>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2fgz|2fgz]], [[2fh6|2fh6]], [[2fh8|2fh8]], [[2fhc|2fhc]], [[2fhf|2fhf]]</div></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Pullulanase Pullulanase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.41 3.2.1.41] </span></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=2fhb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fhb OCA], [https://pdbe.org/2fhb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2fhb RCSB], [https://www.ebi.ac.uk/pdbsum/2fhb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2fhb ProSAT]</span></td></tr>
</table>
== 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/fh/2fhb_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=2fhb ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The crystal structures of Klebsiella pneumoniae pullulanase and its complex with glucose (G1), maltose (G2), isomaltose (isoG2), maltotriose (G3), or maltotetraose (G4), have been refined at around 1.7-1.9A resolution by using a synchrotron radiation source at SPring-8. The refined models contained 920-1052 amino acid residues, 942-1212 water molecules, four or five calcium ions, and the bound sugar moieties. The enzyme is composed of five domains (N1, N2, N3, A, and C). The N1 domain was clearly visible only in the structure of the complex with G3 or G4. The N1 and N2 domains are characteristic of pullulanase, while the N3, A, and C domains have weak similarity with those of Pseudomonas isoamylase. The N1 domain was found to be a new type of carbohydrate-binding domain with one calcium site (CBM41). One G1 bound at subsite -2, while two G2 bound at -1 approximately -2 and +2 approximately +1, two G3, -1 approximately -3 and +2 approximately 0', and two G4, -1 approximately -4 and +2 approximately -1'. The two bound G3 and G4 molecules in the active cleft are almost parallel and interact with each other. The subsites -1 approximately -4 and +1 approximately +2, including catalytic residues Glu706 and Asp677, are conserved between pullulanase and alpha-amylase, indicating that pullulanase strongly recognizes branched point and branched sugar residues, while subsites 0' and -1', which recognize the non-reducing end of main-chain alpha-1,4 glucan, are specific to pullulanase and isoamylase. The comparison suggested that the conformational difference around the active cleft, together with the domain organization, determines the different substrate specificities between pullulanase and isoamylase.

Crystal structure of pullulanase: evidence for parallel binding of oligosaccharides in the active site.,Mikami B, Iwamoto H, Malle D, Yoon HJ, Demirkan-Sarikaya E, Mezaki Y, Katsuya Y J Mol Biol. 2006 Jun 9;359(3):690-707. Epub 2006 Apr 18. PMID:16650854<ref>PMID:16650854</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2fhb" style="background-color:#fffaf0;"></div>

==See Also==
*[[Amylase 3D structures|Amylase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Klebsiella aerogenes]]
[[Category: Large Structures]]
[[Category: Pullulanase]]
[[Category: Demirkan-Sarikaya, E]]
[[Category: Iwamoto, H]]
[[Category: Katsuya, Y]]
[[Category: Malle, D]]
[[Category: Mikami, B]]
[[Category: Yoon, H J]]
[[Category: Alpha-amylase-family]]
[[Category: Beta-alpha-barrel]]
[[Category: Complex with maltose]]
[[Category: Hydrolase]]
[[Category: Multiple domain]]