3rwk: Difference between revisions
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==First crystal structure of an endo-inulinase, from Aspergillus ficuum: structural analysis and comparison with other GH32 enzymes.== | |||
<StructureSection load='3rwk' size='340' side='right'caption='[[3rwk]], [[Resolution|resolution]] 2.10Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3rwk]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Aspergillus_ficuum Aspergillus ficuum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3RWK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3RWK 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]] 2.1Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=FRU:FRUCTOSE'>FRU</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=3rwk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3rwk OCA], [https://pdbe.org/3rwk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3rwk RCSB], [https://www.ebi.ac.uk/pdbsum/3rwk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3rwk ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/INU2_ASPFI INU2_ASPFI] Endo-inulinase involved in utilization of the plant storage polymer inulin, consisting of fructooligosaccharides with a degree of polymerization (DP) value from 2 to 60.<ref>PMID:24251113</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Endo-inulinase is a member of glycosidase hydrolase family 32 (GH32) degrading fructans of the inulin type with an endo-cleavage mode and is an important class of industrial enzyme. In the present study, we report the first crystal structure of an endo-inulinase, INU2, from Aspergillus ficuum at 1.5 A. It was solved by molecular replacement with the structure of exo-inulinase as search model. The 3D structure presents a bimodular arrangement common to other GH32 enzymes: a N-terminal 5-fold beta-propeller catalytic domain with four beta-sheets and a C-terminal beta-sandwich domain organized in two beta-sheets with five beta-strands. The structural analysis and comparison with other GH32 enzymes reveal the presence of an extra pocket in the INU2 catalytic site, formed by two loops and the conserved motif W-M(I)-N-D(E)-P-N-G. This cavity would explain the endo-activity of the enzyme, the critical role of Trp40 and particularly the cleavage at the third unit of the inulin(-like) substrates. Crystal structure at 2.1 A of INU2 complexed with fructosyl molecules, experimental digestion data and molecular modelling studies support these hypotheses. | |||
First crystal structure of an endo-inulinase, INU2, from Aspergillus ficuum: Discovery of an extra-pocket in the catalytic domain responsible for its endo-activity.,Pouyez J, Mayard A, Vandamme AM, Roussel G, Perpete EA, Wouters J, Housen I, Michaux C Biochimie. 2012 Jun 28. PMID:22750808<ref>PMID:22750808</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 3rwk" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Aspergillus ficuum]] | |||
[[Category: Large Structures]] | |||
[[Category: Housen I]] | |||
[[Category: Mayard A]] | |||
[[Category: Michaux C]] | |||
[[Category: Pouyez J]] | |||
[[Category: Roussel G]] | |||
[[Category: Vandamme AM]] | |||
[[Category: Wouters J]] | |||
Latest revision as of 06:09, 17 October 2024
First crystal structure of an endo-inulinase, from Aspergillus ficuum: structural analysis and comparison with other GH32 enzymes.
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