View source for 5by3


==A novel family GH115 4-O-Methyl-alpha-glucuronidase, BtGH115A, with specificity for decorated arabinogalactans==
<StructureSection load='5by3' size='340' side='right'caption='[[5by3]], [[Resolution|resolution]] 2.44&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5by3]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacteroides_thetaiotaomicron_VPI-5482 Bacteroides thetaiotaomicron VPI-5482]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5BY3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5BY3 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</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=5by3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5by3 OCA], [https://pdbe.org/5by3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5by3 RCSB], [https://www.ebi.ac.uk/pdbsum/5by3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5by3 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q8A3J6_BACTN Q8A3J6_BACTN] 
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== Publication Abstract from PubMed ==
Glycoside hydrolases are clustered into families based on amino acid sequence similarities, and belonging to a particular family can infer biological activity of an enzyme. Family GH115 contains alpha-glucuronidases where several members have been shown to hydrolyze terminal alpha-1,2-linked glucuronic acid and 4-O-methylated glucuronic acid from the plant cell wall polysaccharide glucuronoxylan. Other GH115 enzymes show no activity on glucuronoxylan, and therefore, it has been proposed that family GH115 may be a poly-specific family. In this study, we reveal that a putative periplasmic GH115 from the human gut symbiont Bacteroides thetaiotaomicron, BtGH115A, hydrolyzes terminal 4-O-methyl-glucuronic acid residues from decorated arabinogalactan isolated from acacia tree. The three-dimensional structure of BtGH115A reveals that BtGH115A has the same domain architecture as the other structurally characterized member of this family, BoAgu115A; however the position of the C-terminal module is altered with respect to each individual enzyme. Phylogenetic analysis of GH115 amino sequences divides the family into distinct clades that may distinguish different substrate specificities. Finally, we show that BtGH115A alpha-glucuronidase activity is necessary for the sequential digestion of branched galactans from acacia gum by a galactan-beta-1,3-galactosidase from family GH43; however, while B. thetaiotaomicron grows on larch wood arabinogalactan, the bacterium is not able to metabolize acacia gum arabinogalactan, suggesting that BtGH115A is involved in degradation of arabinogalactan fragments liberated by other microbial species in the gastrointestinal tract.

Structural and Functional Characterization of a Novel Family GH115 4-O-Methyl-alpha-Glucuronidase with Specificity for Decorated Arabinogalactans.,Aalbers F, Turkenburg JP, Davies GJ, Dijkhuizen L, Lammerts van Bueren A J Mol Biol. 2015 Jul 14. pii: S0022-2836(15)00384-8. doi:, 10.1016/j.jmb.2015.07.006. PMID:26186997<ref>PMID:26186997</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 5by3" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacteroides thetaiotaomicron VPI-5482]]
[[Category: Large Structures]]
[[Category: Davies GJ]]
[[Category: Lammerts van Bueren A]]
[[Category: Turkenburg JP]]