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==The crystal structure the Glycoside Hydrolase BglX inactive mutant D286N from P. aeruginosa in complex with two glucose molecules== | ==The crystal structure the Glycoside Hydrolase BglX inactive mutant D286N from P. aeruginosa in complex with two glucose molecules== | ||
<StructureSection load='6r5o' size='340' side='right'caption='[[6r5o]]' scene=''> | <StructureSection load='6r5o' size='340' side='right'caption='[[6r5o]], [[Resolution|resolution]] 2.40Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6R5O OCA]. For a <b>guided tour on the structure components</b> use [ | <table><tr><td colspan='2'>[[6r5o]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_aeruginosa_PAO1 Pseudomonas aeruginosa PAO1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6R5O OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6R5O FirstGlance]. <br> | ||
</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.4Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=6r5o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6r5o OCA], [https://pdbe.org/6r5o PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6r5o RCSB], [https://www.ebi.ac.uk/pdbsum/6r5o PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6r5o ProSAT]</span></td></tr> | |||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/Q9I311_PSEAE Q9I311_PSEAE] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
BglX is a heretofore uncharacterized periplasmic glycoside hydrolase (GH) of the human pathogen Pseudomonas aeruginosa. X-ray analysis identifies it as a protein homodimer. The two active sites of the homodimer comprise catalytic residues provided by each monomer. This arrangement is seen in <2% of the hydrolases of known structure. In vitro substrate profiling shows BglX is a catalyst for beta-(1-->2) and beta-(1-->3) saccharide hydrolysis. Saccharides with beta-(1-->4) or beta-(1-->6) bonds, and the beta-(1-->4) muropeptides from the cell-wall peptidoglycan, are not substrates. Additional structural insights from X-ray analysis (including structures of a mutant enzyme-derived Michaelis complex, two transition-state mimetics, and two enzyme-product complexes) enabled the comprehensive description of BglX catalysis. The half-chair ((4)H3) conformation of the transition-state oxocarbenium species, the approach of the hydrolytic water molecule to the oxocarbenium species, and the stepwise release of the two reaction products were also visualized. The substrate pattern for BglX aligns with the [beta-(1-->2)-Glc]x and [beta-(1-->3)-Glc]x periplasmic osmoregulated periplasmic glucans, and possibly with the Psl exopolysaccharides, of P. aeruginosa. Both polysaccharides are implicated in biofilm formation. Accordingly, we show that inactivation of the bglX gene of P. aeruginosa PAO1 attenuates biofilm formation. | |||
Catalytic Cycle of Glycoside Hydrolase BglX from Pseudomonas aeruginosa and Its Implications for Biofilm Formation.,Mahasenan KV, Batuecas MT, De Benedetti S, Kim C, Rana N, Lee M, Hesek D, Fisher JF, Sanz-Aparicio J, Hermoso JA, Mobashery S ACS Chem Biol. 2020 Jan 17;15(1):189-196. doi: 10.1021/acschembio.9b00754. Epub, 2020 Jan 7. PMID:31877028<ref>PMID:31877028</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 6r5o" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Beta-glucosidase 3D structures|Beta-glucosidase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: Pseudomonas aeruginosa PAO1]] | |||
[[Category: Batuecas MT]] | [[Category: Batuecas MT]] | ||
[[Category: Hermoso JA]] | [[Category: Hermoso JA]] | ||
Latest revision as of 15:15, 24 January 2024
The crystal structure the Glycoside Hydrolase BglX inactive mutant D286N from P. aeruginosa in complex with two glucose moleculesThe crystal structure the Glycoside Hydrolase BglX inactive mutant D286N from P. aeruginosa in complex with two glucose molecules
Structural highlights
FunctionPublication Abstract from PubMedBglX is a heretofore uncharacterized periplasmic glycoside hydrolase (GH) of the human pathogen Pseudomonas aeruginosa. X-ray analysis identifies it as a protein homodimer. The two active sites of the homodimer comprise catalytic residues provided by each monomer. This arrangement is seen in <2% of the hydrolases of known structure. In vitro substrate profiling shows BglX is a catalyst for beta-(1-->2) and beta-(1-->3) saccharide hydrolysis. Saccharides with beta-(1-->4) or beta-(1-->6) bonds, and the beta-(1-->4) muropeptides from the cell-wall peptidoglycan, are not substrates. Additional structural insights from X-ray analysis (including structures of a mutant enzyme-derived Michaelis complex, two transition-state mimetics, and two enzyme-product complexes) enabled the comprehensive description of BglX catalysis. The half-chair ((4)H3) conformation of the transition-state oxocarbenium species, the approach of the hydrolytic water molecule to the oxocarbenium species, and the stepwise release of the two reaction products were also visualized. The substrate pattern for BglX aligns with the [beta-(1-->2)-Glc]x and [beta-(1-->3)-Glc]x periplasmic osmoregulated periplasmic glucans, and possibly with the Psl exopolysaccharides, of P. aeruginosa. Both polysaccharides are implicated in biofilm formation. Accordingly, we show that inactivation of the bglX gene of P. aeruginosa PAO1 attenuates biofilm formation. Catalytic Cycle of Glycoside Hydrolase BglX from Pseudomonas aeruginosa and Its Implications for Biofilm Formation.,Mahasenan KV, Batuecas MT, De Benedetti S, Kim C, Rana N, Lee M, Hesek D, Fisher JF, Sanz-Aparicio J, Hermoso JA, Mobashery S ACS Chem Biol. 2020 Jan 17;15(1):189-196. doi: 10.1021/acschembio.9b00754. Epub, 2020 Jan 7. PMID:31877028[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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