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==Structure and function of a novel periplasmic chitooligosaccharide-binding protein from marine Vibrio bacteria==
<StructureSection load='5yqw' size='340' side='right'caption='[[5yqw]], [[Resolution|resolution]] 1.36&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5yqw]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Vibrio_harveyi_1DA3 Vibrio harveyi 1DA3]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5YQW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5YQW 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]] 1.36&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene>, <scene name='pdbligand=P4G:1-ETHOXY-2-(2-ETHOXYETHOXY)ETHANE'>P4G</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=5yqw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5yqw OCA], [https://pdbe.org/5yqw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5yqw RCSB], [https://www.ebi.ac.uk/pdbsum/5yqw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5yqw ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
Periplasmic solute-binding proteins in bacteria are involved in the active transport of nutrients into the cytoplasm. In marine bacteria of the genus Vibrio, a chitooligosaccharide-binding protein (CBP) is thought to be the major solute-binding protein controlling the rate of chitin uptake in these bacteria. However, the molecular mechanism of the CBP involvement in chitin metabolism has not been elucidated. Here, we report the structure and function of a recombinant chitooligosaccharide-binding protein from Vibrio harveyi, namely VhCBP, expressed in Escherichia coli Isothermal titration calorimetry revealed that VhCBP strongly binds shorter chitooligosaccharides ((GlcNAc) n , where n = 2, 3, and 4) with affinities that are considerably greater than those for glycoside hydrolase family 18 and 19 chitinases but does not bind longer ones, including insoluble chitin polysaccharides. We also found that VhCBP comprises two domains with flexible linkers and that the domain-domain interface forms the sugar-binding cleft, which is not long extended but forms a small cavity. (GlcNAc)2 bound to this cavity, apparently triggering a closed conformation of VhCBP. Trp-363 and Trp-513, which stack against the two individual GlcNAc rings, likely make a major contribution to the high affinity of VhCBP for (GlcNAc)2 The strong chitobiose binding, followed by the conformational change of VhCBP, may facilitate its interaction with an active-transport system in the inner membrane of Vibrio species.

Structure and function of a novel periplasmic chitooligosaccharide-binding protein from marine Vibrio bacteria.,Suginta W, Sritho N, Ranok A, Bulmer DM, Kitaoku Y, van den Berg B, Fukamizo T J Biol Chem. 2018 Apr 6;293(14):5150-5159. doi: 10.1074/jbc.RA117.001012. Epub, 2018 Feb 14. PMID:29444825<ref>PMID:29444825</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 5yqw" style="background-color:#fffaf0;"></div>

==See Also==
*[[ABC transporter 3D structures|ABC transporter 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Vibrio harveyi 1DA3]]
[[Category: Bulmer DM]]
[[Category: Fukamizo T]]
[[Category: Kitaoku Y]]
[[Category: Ranok A]]
[[Category: Sritho N]]
[[Category: Suginta W]]
[[Category: Van den Berg B]]