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< | ==Structure of the GH99 endo-alpha-mannosidase from Bacteriodes thetaiotaomicron in complex with BIS-TRIS-Propane== | ||
<StructureSection load='4ad0' size='340' side='right'caption='[[4ad0]], [[Resolution|resolution]] 2.09Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4ad0]] is a 4 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=4AD0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4AD0 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]] 2.09Å</td></tr> | |||
- | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=B3P:2-[3-(2-HYDROXY-1,1-DIHYDROXYMETHYL-ETHYLAMINO)-PROPYLAMINO]-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>B3P</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</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=4ad0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ad0 OCA], [https://pdbe.org/4ad0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ad0 RCSB], [https://www.ebi.ac.uk/pdbsum/4ad0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ad0 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q8A109_BACTN Q8A109_BACTN] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
N-linked glycans play key roles in protein folding, stability, and function. Biosynthetic modification of N-linked glycans, within the endoplasmic reticulum, features sequential trimming and readornment steps. One unusual enzyme, endo-alpha-mannosidase, cleaves mannoside linkages internally within an N-linked glycan chain, short circuiting the classical N-glycan biosynthetic pathway. Here, using two bacterial orthologs, we present the first structural and mechanistic dissection of endo-alpha-mannosidase. Structures solved at resolutions 1.7-2.1 A reveal a (beta/alpha)(8) barrel fold in which the catalytic center is present in a long substrate-binding groove, consistent with cleavage within the N-glycan chain. Enzymatic cleavage of authentic Glc(1/3)Man(9)GlcNAc(2) yields Glc(1/3)-Man. Using the bespoke substrate alpha-Glc-1,3-alpha-Man fluoride, the enzyme was shown to act with retention of anomeric configuration. Complexes with the established endo-alpha-mannosidase inhibitor alpha-Glc-1,3-deoxymannonojirimycin and a newly developed inhibitor, alpha-Glc-1,3-isofagomine, and with the reducing-end product alpha-1,2-mannobiose structurally define the -2 to +2 subsites of the enzyme. These structural and mechanistic data provide a foundation upon which to develop new enzyme inhibitors targeting the hijacking of N-glycan synthesis in viral disease and cancer. | |||
Structural and mechanistic insight into N-glycan processing by endo-alpha-mannosidase.,Thompson AJ, Williams RJ, Hakki Z, Alonzi DS, Wennekes T, Gloster TM, Songsrirote K, Thomas-Oates JE, Wrodnigg TM, Spreitz J, Stutz AE, Butters TD, Williams SJ, Davies GJ Proc Natl Acad Sci U S A. 2012 Jan 4. PMID:22219371<ref>PMID:22219371</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 4ad0" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Mannosidase 3D structures|Mannosidase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
== | [[Category: Bacteroides thetaiotaomicron VPI-5482]] | ||
[[ | [[Category: Large Structures]] | ||
[[Category: Alonzi DS]] | |||
== | [[Category: Butters TD]] | ||
< | [[Category: Davies GJ]] | ||
[[Category: Bacteroides thetaiotaomicron]] | [[Category: Gloster TM]] | ||
[[Category: | [[Category: Hakki Z]] | ||
[[Category: Alonzi | [[Category: Songsrirote K]] | ||
[[Category: Butters | [[Category: Spreitz J]] | ||
[[Category: Davies | [[Category: Stuetz AE]] | ||
[[Category: Gloster | [[Category: Thomas-Oates JE]] | ||
[[Category: Hakki | [[Category: Thompson AJ]] | ||
[[Category: Songsrirote | [[Category: Wennekes T]] | ||
[[Category: Spreitz | [[Category: Williams RJ]] | ||
[[Category: Stuetz | [[Category: Williams SJ]] | ||
[[Category: Thomas-Oates | [[Category: Wrodnigg TM]] | ||
[[Category: Thompson | |||
[[Category: Wennekes | |||
[[Category: Williams | |||
[[Category: Williams | |||
[[Category: Wrodnigg | |||
Latest revision as of 14:24, 20 December 2023
Structure of the GH99 endo-alpha-mannosidase from Bacteriodes thetaiotaomicron in complex with BIS-TRIS-PropaneStructure of the GH99 endo-alpha-mannosidase from Bacteriodes thetaiotaomicron in complex with BIS-TRIS-Propane
Structural highlights
FunctionPublication Abstract from PubMedN-linked glycans play key roles in protein folding, stability, and function. Biosynthetic modification of N-linked glycans, within the endoplasmic reticulum, features sequential trimming and readornment steps. One unusual enzyme, endo-alpha-mannosidase, cleaves mannoside linkages internally within an N-linked glycan chain, short circuiting the classical N-glycan biosynthetic pathway. Here, using two bacterial orthologs, we present the first structural and mechanistic dissection of endo-alpha-mannosidase. Structures solved at resolutions 1.7-2.1 A reveal a (beta/alpha)(8) barrel fold in which the catalytic center is present in a long substrate-binding groove, consistent with cleavage within the N-glycan chain. Enzymatic cleavage of authentic Glc(1/3)Man(9)GlcNAc(2) yields Glc(1/3)-Man. Using the bespoke substrate alpha-Glc-1,3-alpha-Man fluoride, the enzyme was shown to act with retention of anomeric configuration. Complexes with the established endo-alpha-mannosidase inhibitor alpha-Glc-1,3-deoxymannonojirimycin and a newly developed inhibitor, alpha-Glc-1,3-isofagomine, and with the reducing-end product alpha-1,2-mannobiose structurally define the -2 to +2 subsites of the enzyme. These structural and mechanistic data provide a foundation upon which to develop new enzyme inhibitors targeting the hijacking of N-glycan synthesis in viral disease and cancer. Structural and mechanistic insight into N-glycan processing by endo-alpha-mannosidase.,Thompson AJ, Williams RJ, Hakki Z, Alonzi DS, Wennekes T, Gloster TM, Songsrirote K, Thomas-Oates JE, Wrodnigg TM, Spreitz J, Stutz AE, Butters TD, Williams SJ, Davies GJ Proc Natl Acad Sci U S A. 2012 Jan 4. PMID:22219371[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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