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==Structure of Vibrio cholerae chitin de-N-acetylase in complex with acetate ion (ACT) in P 2 21 21==
<StructureSection load='4nyy' size='340' side='right'caption='[[4nyy]], [[Resolution|resolution]] 2.65&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4nyy]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Vibrio_cholerae_O1_str._NHCC-010F Vibrio cholerae O1 str. NHCC-010F]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4NYY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4NYY 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]] 2.65&#8491;</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=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=4nyy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4nyy OCA], [https://pdbe.org/4nyy PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4nyy RCSB], [https://www.ebi.ac.uk/pdbsum/4nyy PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4nyy ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Cell signaling and other biological activities of chitooligosaccharides (COSs) seem to be dependent not only on the degree of polymerization, but markedly on the specific de-N-acetylation pattern. Chitin de-N-acetylases (CDAs) catalyze the hydrolysis of the acetamido group in GlcNAc residues of chitin, chitosan, and COS. A major challenge is to understand how CDAs specifically define the distribution of GlcNAc and GlcNH2 moieties in the oligomeric chain. We report the crystal structure of the Vibrio cholerae CDA in four relevant states of its catalytic cycle. The two enzyme complexes with chitobiose and chitotriose represent the first 3D structures of a CDA with its natural substrates in a productive mode for catalysis, thereby unraveling an induced-fit mechanism with a significant conformational change of a loop closing the active site. We propose that the deacetylation pattern exhibited by different CDAs is governed by critical loops that shape and differentially block accessible subsites in the binding cleft of CE4 enzymes.

Structural basis of chitin oligosaccharide deacetylation.,Andres E, Albesa-Jove D, Biarnes X, Moerschbacher BM, Guerin ME, Planas A Angew Chem Int Ed Engl. 2014 Jul 1;53(27):6882-7. doi: 10.1002/anie.201400220., Epub 2014 May 8. PMID:24810719<ref>PMID:24810719</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4nyy" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Vibrio cholerae O1 str. NHCC-010F]]
[[Category: Albesa-Jove D]]
[[Category: Andres E]]
[[Category: Biarnes X]]
[[Category: Guerin ME]]
[[Category: Planas A]]