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| | ==Solution Structure of AlgE6R2 subunit from the Azotobacter vinelandii Mannuronan C5-epimerase== | | ==Solution Structure of AlgE6R2 subunit from the Azotobacter vinelandii Mannuronan C5-epimerase== |
| - | <StructureSection load='2ml2' size='340' side='right' caption='[[2ml2]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''> | + | <StructureSection load='2ml2' size='340' side='right'caption='[[2ml2]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2ml2]] is a 1 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ML2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ML2 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2ml2]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Azotobacter_vinelandii Azotobacter vinelandii]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ML2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ML2 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2pyh|2pyh]], [[2agm|2agm]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ml2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ml2 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2ml2 RCSB], [http://www.ebi.ac.uk/pdbsum/2ml2 PDBsum]</span></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=2ml2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ml2 OCA], [https://pdbe.org/2ml2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2ml2 RCSB], [https://www.ebi.ac.uk/pdbsum/2ml2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2ml2 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/ALGE6_AZOVI ALGE6_AZOVI]] Converts beta-D-mannuronic acid (M) to alpha-L-guluronic acid (G), producing a polymer with gel-forming capacity, required for the formation of the cyst coat. | + | [https://www.uniprot.org/uniprot/ALGE6_AZOVI ALGE6_AZOVI] Converts beta-D-mannuronic acid (M) to alpha-L-guluronic acid (G), producing a polymer with gel-forming capacity, required for the formation of the cyst coat. |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> |
| | </div> | | </div> |
| | + | <div class="pdbe-citations 2ml2" style="background-color:#fffaf0;"></div> |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Aachmann, F L]] | + | [[Category: Azotobacter vinelandii]] |
| - | [[Category: Buchinger, E]] | + | [[Category: Large Structures]] |
| - | [[Category: Wimmer, R]] | + | [[Category: Aachmann FL]] |
| - | [[Category: Alginate c-5 epimerase]] | + | [[Category: Buchinger E]] |
| - | [[Category: Isomerase]]
| + | [[Category: Wimmer R]] |
| - | [[Category: Mannuronan c-5 epimerase]]
| + | |
| - | [[Category: R-module]] | + | |
| Structural highlights
Function
ALGE6_AZOVI Converts beta-D-mannuronic acid (M) to alpha-L-guluronic acid (G), producing a polymer with gel-forming capacity, required for the formation of the cyst coat.
Publication Abstract from PubMed
The bacterium Azotobacter vinelandii produces a family of seven secreted and calcium-dependent mannuronan C-5 epimerases (AlgE1-7). These epimerases are responsible for the epimerization of beta-d-mannuronic acid (M) to alpha-l-guluronic acid (G) in alginate polymers. The epimerases display a modular structure composed of one or two catalytic A-modules and from one to seven R-modules having an activating effect on the A-module. In this study, we have determined the NMR structure of the three individual R-modules from AlgE6 (AR1R2R3) and the overall structure of both AlgE4 (AR) and AlgE6 using small angle x-ray scattering. Furthermore, the alginate binding ability of the R-modules of AlgE4 and AlgE6 has been studied with NMR and isothermal titration calorimetry. The AlgE6 R-modules fold into an elongated parallel beta-roll with a shallow, positively charged groove across the module. Small angle x-ray scattering analyses of AlgE4 and AlgE6 show an overall elongated shape with some degree of flexibility between the modules for both enzymes. Titration of the R-modules with defined alginate oligomers shows strong interaction between AlgE4R and both oligo-M and MG, whereas no interaction was detected between these oligomers and the individual R-modules from AlgE6. A combination of all three R-modules from AlgE6 shows weak interaction with long M-oligomers. Exchanging the R-modules between AlgE4 and AlgE6 resulted in a novel epimerase called AlgE64 with increased G-block forming ability compared with AlgE6.
Structural and Functional Characterization of the R-modules in Alginate C-5 Epimerases AlgE4 and AlgE6 from Azotobacter vinelandii.,Buchinger E, Knudsen DH, Behrens MA, Pedersen JS, Aarstad OA, Tondervik A, Valla S, Skjak-Braek G, Wimmer R, Aachmann FL J Biol Chem. 2014 Nov 7;289(45):31382-96. doi: 10.1074/jbc.M114.567008. Epub 2014, Sep 29. PMID:25266718[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Buchinger E, Knudsen DH, Behrens MA, Pedersen JS, Aarstad OA, Tondervik A, Valla S, Skjak-Braek G, Wimmer R, Aachmann FL. Structural and Functional Characterization of the R-modules in Alginate C-5 Epimerases AlgE4 and AlgE6 from Azotobacter vinelandii. J Biol Chem. 2014 Nov 7;289(45):31382-96. doi: 10.1074/jbc.M114.567008. Epub 2014, Sep 29. PMID:25266718 doi:http://dx.doi.org/10.1074/jbc.M114.567008
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