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==Chitin-active AA10 LPMO (GbpA) from Vibrio campbellii==
<StructureSection load='8gum' size='340' side='right'caption='[[8gum]], [[Resolution|resolution]] 2.35&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8gum]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Vibrio_campbellii_ATCC_BAA-1116 Vibrio campbellii ATCC BAA-1116]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8GUM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8GUM 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]] 2.35&#8491;</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=8gum FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8gum OCA], [https://pdbe.org/8gum PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8gum RCSB], [https://www.ebi.ac.uk/pdbsum/8gum PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8gum ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GBPA_VIBC1 GBPA_VIBC1] Probably interacts with GlcNAc residues. May promote attachment to both epithelial cell surfaces and chitin.[HAMAP-Rule:MF_01905]
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== Publication Abstract from PubMed ==
Vibrio spp. play a crucial role in the global recycling of the highly abundant recalcitrant biopolymer chitin in marine ecosystems through their ability to secrete chitin-degrading enzymes to efficiently hydrolyse chitinous materials and use them as their major carbon source. In this study, the first crystal structures of a complete four-domain chitin-active AA10 lytic polysaccharide monooxygenase from the chitinolytic bacterium Vibrio campbellii type strain ATCC BAA-1116 are reported. The crystal structures of apo and copper-bound VhLPMO10A were resolved as homodimers with four distinct domains: an N-terminal AA10 catalytic (CatD) domain connected to a GlcNAc-binding (GbpA_2) domain, followed by a module X domain and a C-terminal carbohydrate-binding module (CBM73). Size-exclusion chromatography and small-angle X-ray scattering analysis confirmed that VhLPMO10A exists as a monomer in solution. The active site of VhLPMO10A is located on the surface of the CatD domain, with three conserved residues (His1, His98 and Phe170) forming the copper(II)-binding site. Metal-binding studies using synchrotron X-ray absorption spectroscopy and X-ray fluorescence, together with electron paramagnetic resonance spectroscopy, gave consistently strong copper(II) signals in the protein samples, confirming that VhLPMO10A is a copper-dependent enzyme. ITC binding data showed that VhLPMO10A could bind various divalent cations but bound most strongly to copper(II) ions, with a K(d) of 0.1 +/- 0.01 microM. In contrast, a K(d) of 1.9 nM was estimated for copper(I) ions from redox-potential measurements. The presence of ascorbic acid is essential for H(2)O(2) production in the reaction catalysed by VhLPMO10A. MALDI-TOF MS identified VhLPMO10A as a C1-specific LPMO, generating oxidized chitooligosaccharide products with different degrees of polymerization (DP2(ox)-DP8(ox)). This new member of the chitin-active AA10 LPMOs could serve as a powerful biocatalyst in biofuel production from chitin biomass.

Structural and binding studies of a new chitin-active AA10 lytic polysaccharide monooxygenase from the marine bacterium Vibrio campbellii.,Zhou Y, Wannapaiboon S, Prongjit M, Pornsuwan S, Sucharitakul J, Kamonsutthipaijit N, Robinson RC, Suginta W Acta Crystallogr D Struct Biol. 2023 Jun 1;79(Pt 6):479-497. doi: , 10.1107/S2059798323003261. Epub 2023 May 30. PMID:37259836<ref>PMID:37259836</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Vibrio campbellii ATCC BAA-1116]]
[[Category: Robinson RC]]
[[Category: Suginta W]]
[[Category: Zhou Y]]