View source for 5mdq


==Crystal structure of outer membrane expressed Chitoporin VhChip from Vibrio harveyi==
<StructureSection load='5mdq' size='340' side='right'caption='[[5mdq]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5mdq]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Vibrio_harveyi Vibrio harveyi]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5MDQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5MDQ 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</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=5mdq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5mdq OCA], [https://pdbe.org/5mdq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5mdq RCSB], [https://www.ebi.ac.uk/pdbsum/5mdq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5mdq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/L0RVU0_VIBHA L0RVU0_VIBHA] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Chitin, an insoluble polymer of N-acetylglucosamine, is one of the most abundant biopolymers on Earth. By degrading chitin, chitinolytic bacteria such as Vibrio harveyi are critical for chitin recycling and maintenance of carbon and nitrogen cycles in the world's oceans. A decisive step in chitin degradation is the uptake of chito-oligosaccharides by an outer membrane protein channel named chitoporin (ChiP). Here, we report X-ray crystal structures of ChiP from V. harveyi in the presence and absence of chito-oligosaccharides. Structures without bound sugar reveal a trimeric assembly with an unprecedented closing of the transport pore by the N-terminus of a neighboring subunit. Substrate binding ejects the pore plug to open the transport channel. Together with molecular dynamics simulations, electrophysiology and in vitro transport assays our data provide an explanation for the exceptional affinity of ChiP for chito-oligosaccharides and point to an important role of the N-terminal gate in substrate transport.

Structural basis for chitin acquisition by marine Vibrio species.,Aunkham A, Zahn M, Kesireddy A, Pothula KR, Schulte A, Basle A, Kleinekathofer U, Suginta W, van den Berg B Nat Commun. 2018 Jan 15;9(1):220. doi: 10.1038/s41467-017-02523-y. PMID:29335469<ref>PMID:29335469</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5mdq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Porin 3D structures|Porin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Vibrio harveyi]]
[[Category: Zahn M]]
[[Category: Van den Berg B]]