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==STRUCTURE OF P. CITRINUM ALPHA 1,2-MANNOSIDASE REVEALS THE BASIS FOR DIFFERENCES IN SPECIFICITY OF THE ER AND GOLGI CLASS I ENZYMES== | ==STRUCTURE OF P. CITRINUM ALPHA 1,2-MANNOSIDASE REVEALS THE BASIS FOR DIFFERENCES IN SPECIFICITY OF THE ER AND GOLGI CLASS I ENZYMES== | ||
<StructureSection load='1krf' size='340' side='right' caption='[[1krf]], [[Resolution|resolution]] 2.20Å' scene=''> | <StructureSection load='1krf' size='340' side='right'caption='[[1krf]], [[Resolution|resolution]] 2.20Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1krf]] is a 2 chain structure with sequence from [ | <table><tr><td colspan='2'>[[1krf]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Penicillium_citrinum Penicillium citrinum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KRF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KRF FirstGlance]. <br> | ||
</td></tr><tr id=' | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2Å</td></tr> | ||
<tr id=' | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=KIF:KIFUNENSINE'>KIF</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</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=1krf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1krf OCA], [https://pdbe.org/1krf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1krf RCSB], [https://www.ebi.ac.uk/pdbsum/1krf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1krf ProSAT]</span></td></tr> | |||
< | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | |||
</table> | </table> | ||
== Function == | == Function == | ||
[ | [https://www.uniprot.org/uniprot/MAN12_PENCI MAN12_PENCI] Involved in the maturation of Asn-linked oligosaccharides. Progressively trim alpha-1,2-linked mannose residues from Man(9)GlcNAc(2) to produce Man(5)GlcNAc(2). | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/kr/1krf_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/kr/1krf_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/ | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
</jmolCheckbox> | </jmolCheckbox> | ||
| Line 31: | Line 29: | ||
</div> | </div> | ||
<div class="pdbe-citations 1krf" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 1krf" style="background-color:#fffaf0;"></div> | ||
==See Also== | |||
*[[Mannosidase 3D structures|Mannosidase 3D structures]] | |||
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: | [[Category: Penicillium citrinum]] | ||
[[Category: Herscovics | [[Category: Herscovics A]] | ||
[[Category: Howell | [[Category: Howell PL]] | ||
[[Category: Imberty | [[Category: Imberty A]] | ||
[[Category: Lobsanov | [[Category: Lobsanov YD]] | ||
[[Category: Vallee | [[Category: Vallee F]] | ||
[[Category: Yip | [[Category: Yip P]] | ||
[[Category: Yoshida | [[Category: Yoshida T]] | ||
Latest revision as of 11:35, 6 November 2024
STRUCTURE OF P. CITRINUM ALPHA 1,2-MANNOSIDASE REVEALS THE BASIS FOR DIFFERENCES IN SPECIFICITY OF THE ER AND GOLGI CLASS I ENZYMESSTRUCTURE OF P. CITRINUM ALPHA 1,2-MANNOSIDASE REVEALS THE BASIS FOR DIFFERENCES IN SPECIFICITY OF THE ER AND GOLGI CLASS I ENZYMES
Structural highlights
FunctionMAN12_PENCI Involved in the maturation of Asn-linked oligosaccharides. Progressively trim alpha-1,2-linked mannose residues from Man(9)GlcNAc(2) to produce Man(5)GlcNAc(2). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedClass I alpha1,2-mannosidases (glycosylhydrolase family 47) are key enzymes in the maturation of N-glycans. This protein family includes two distinct enzymatically active subgroups. Subgroup 1 includes the yeast and human endoplasmic reticulum (ER) alpha1,2-mannosidases that primarily trim Man(9)GlcNAc(2) to Man(8)GlcNAc(2) isomer B whereas subgroup 2 includes mammalian Golgi alpha1,2-mannosidases IA, IB, and IC that trim Man(9)GlcNAc(2) to Man(5)GlcNAc(2) via Man(8)GlcNAc(2) isomers A and C. The structure of the catalytic domain of the subgroup 2 alpha1,2-mannosidase from Penicillium citrinum has been determined by molecular replacement at 2.2-A resolution. The fungal alpha1,2-mannosidase is an (alphaalpha)(7)-helix barrel, very similar to the subgroup 1 yeast (Vallee, F., Lipari, F., Yip, P., Sleno, B., Herscovics, A., and Howell, P. L. (2000) EMBO J. 19, 581-588) and human (Vallee, F., Karaveg, K., Herscovics, A., Moremen, K. W., and Howell, P. L. (2000) J. Biol. Chem. 275, 41287-41298) ER enzymes. The location of the conserved acidic residues of the catalytic site and the binding of the inhibitors, kifunensine and 1-deoxymannojirimycin, to the essential calcium ion are conserved in the fungal enzyme. However, there are major structural differences in the oligosaccharide binding site between the two alpha1,2-mannosidase subgroups. In the subgroup 1 enzymes, an arginine residue plays a critical role in stabilizing the oligosaccharide substrate. In the fungal alpha1,2-mannosidase this arginine is replaced by glycine. This replacement and other sequence variations result in a more spacious carbohydrate binding site. Modeling studies of interactions between the yeast, human and fungal enzymes with different Man(8)GlcNAc(2) isomers indicate that there is a greater degree of freedom to bind the oligosaccharide in the active site of the fungal enzyme than in the yeast and human ER alpha1,2-mannosidases. Structure of Penicillium citrinum alpha 1,2-mannosidase reveals the basis for differences in specificity of the endoplasmic reticulum and Golgi class I enzymes.,Lobsanov YD, Vallee F, Imberty A, Yoshida T, Yip P, Herscovics A, Howell PL J Biol Chem. 2002 Feb 15;277(7):5620-30. Epub 2001 Nov 19. PMID:11714724[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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