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| | <StructureSection load='6jqc' size='340' side='right'caption='[[6jqc]], [[Resolution|resolution]] 1.80Å' scene=''> | | <StructureSection load='6jqc' size='340' side='right'caption='[[6jqc]], [[Resolution|resolution]] 1.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6jqc]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6JQC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6JQC FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6jqc]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Aspergillus_fumigatus_Af293 Aspergillus fumigatus Af293]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6JQC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6JQC FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8Å</td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Carbonate_dehydratase Carbonate dehydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.1 4.2.1.1] </span></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</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=6jqc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6jqc OCA], [http://pdbe.org/6jqc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6jqc RCSB], [http://www.ebi.ac.uk/pdbsum/6jqc PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6jqc ProSAT]</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=6jqc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6jqc OCA], [https://pdbe.org/6jqc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6jqc RCSB], [https://www.ebi.ac.uk/pdbsum/6jqc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6jqc ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/Q4WPJ0_ASPFU Q4WPJ0_ASPFU]] Reversible hydration of carbon dioxide.[RuleBase:RU003956] | + | [https://www.uniprot.org/uniprot/Q4WPJ0_ASPFU Q4WPJ0_ASPFU] Reversible hydration of carbon dioxide.[RuleBase:RU003956] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </div> | | </div> |
| | <div class="pdbe-citations 6jqc" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 6jqc" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[Carbonic anhydrase 3D structures|Carbonic anhydrase 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Carbonate dehydratase]] | + | [[Category: Aspergillus fumigatus Af293]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Hong, S]] | + | [[Category: Hong S]] |
| - | [[Category: Jin, M S]] | + | [[Category: Jin MS]] |
| - | [[Category: Kim, N J]] | + | [[Category: Kim NJ]] |
| - | [[Category: Kim, S]] | + | [[Category: Kim S]] |
| - | [[Category: Sung, J]] | + | [[Category: Sung J]] |
| - | [[Category: Aspergillus fumigatus]]
| + | |
| - | [[Category: Beta-class carbonic anhydrase]]
| + | |
| - | [[Category: Cafc]]
| + | |
| - | [[Category: Lyase]]
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| Structural highlights
Function
Q4WPJ0_ASPFU Reversible hydration of carbon dioxide.[RuleBase:RU003956]
Publication Abstract from PubMed
The beta-carbonic anhydrases (beta-CAs) are widely distributed zinc-metalloenzymes that play essential roles in growth, survival, development and virulence in fungi. The majority of filamentous ascomycetes possess multiple beta-CA isoforms among which major and minor forms have been characterized. We examined the catalytic behavior of the two minor beta-CAs, CafC and CafD, of Aspergillus fumigatus, and found that both enzymes exhibited low CO2 hydration activities. To understand the structural basis of their low activities, we performed X-ray crystallographic and site-directed mutagenesis studies. Both enzymes exist as homodimers. Like other Type-I beta-CAs, the CafC active site has an "open" conformation in which the zinc ion is tetrahedrally coordinated by three residues (C36, H88 and C91) and a water molecule. However, L25 and L78 on the rim of the catalytic entry site protrude into the active site cleft, partially occluding access to it. Single (L25G or L78G) and double mutants provided evidence that widening the entrance to the active site greatly accelerates catalytic activity. By contrast, CafD has a typical Type-II "closed" conformation in which the zinc-bound water molecule is replaced by aspartic acid (D36). The most likely explanation for this result is that an arginine that is largely conserved within the beta-CA family is replaced by glycine (G38), so that D36 cannot undergo a conformational change by forming a D-R pair that creates the space for a zinc-bound water molecule and switches the enzyme to the active form. The CafD structure also reveals the presence of a "non-catalytic" zinc ion in the dimer interface, which may contribute to stabilizing the dimeric assembly.
The structural basis of the low catalytic activities of the two minor beta-carbonic anhydrases of the filamentous fungus Aspergillus fumigatus.,Kim S, Kim NJ, Hong S, Kim S, Sung J, Jin MS J Struct Biol. 2019 Jul 31. pii: S1047-8477(19)30159-5. doi:, 10.1016/j.jsb.2019.07.011. PMID:31376470[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Kim S, Kim NJ, Hong S, Kim S, Sung J, Jin MS. The structural basis of the low catalytic activities of the two minor beta-carbonic anhydrases of the filamentous fungus Aspergillus fumigatus. J Struct Biol. 2019 Jul 31. pii: S1047-8477(19)30159-5. doi:, 10.1016/j.jsb.2019.07.011. PMID:31376470 doi:http://dx.doi.org/10.1016/j.jsb.2019.07.011
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