7ati
From Proteopedia
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==Crystal structure of dimeric chlorite dismutase variant Q74V (CCld Q74V) from Cyanothece sp. PCC7425== | ==Crystal structure of dimeric chlorite dismutase variant Q74V (CCld Q74V) from Cyanothece sp. PCC7425== | ||
| - | <StructureSection load='7ati' size='340' side='right'caption='[[7ati]]' scene=''> | + | <StructureSection load='7ati' size='340' side='right'caption='[[7ati]], [[Resolution|resolution]] 1.51Å' 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=7ATI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7ATI FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[7ati]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Cyanothece_sp._PCC_7425 Cyanothece sp. PCC 7425]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7ATI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7ATI FirstGlance]. <br> |
| - | </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=7ati FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ati OCA], [https://pdbe.org/7ati PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ati RCSB], [https://www.ebi.ac.uk/pdbsum/7ati PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ati ProSAT]</span></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]] 1.51Å</td></tr> |
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</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=7ati FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ati OCA], [https://pdbe.org/7ati PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ati RCSB], [https://www.ebi.ac.uk/pdbsum/7ati PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ati ProSAT]</span></td></tr> | ||
</table> | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/B8HNS6_CYAP4 B8HNS6_CYAP4] | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Chlorite dismutases (Clds) are heme b-containing oxidoreductases that can decompose chlorite to chloride and molecular oxygen. They are divided in two clades that differ in oligomerization, subunit architecture, and the hydrogen-bonding network of the distal catalytic arginine, which is proposed to switch between two conformations during turnover. To understand the impact of the conformational dynamics of this basic amino acid on heme coordination, structure, and catalysis, Cld from Cyanothece sp. PCC7425 was used as a model enzyme. As typical for a clade 2 Cld, its distal arginine 127 is hydrogen-bonded to glutamine 74. The latter has been exchanged with either glutamate (Q74E) to arrest R127 in a salt bridge or valine (Q74V) that mirrors the setting in clade 1 Clds. We present the X-ray crystal structures of Q74V and Q74E and demonstrate the pH-induced changes in the environment and coordination of the heme iron by ultraviolet-visible, circular dichroism, and electron paramagnetic resonance spectroscopies as well as differential scanning calorimetry. The conformational dynamics of R127 is shown to have a significant role in heme coordination during the alkaline transition and in the thermal stability of the heme cavity, whereas its impact on the catalytic efficiency of chlorite degradation is relatively small. The findings are discussed with respect to (i) the flexible loop connecting the N-terminal and C-terminal ferredoxin-like domains, which differs in clade 1 and clade 2 Clds and carries Q74 in clade 2 proteins, and (ii) the proposed role(s) of the arginine in catalysis. | ||
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| + | Arresting the Catalytic Arginine in Chlorite Dismutases: Impact on Heme Coordination, Thermal Stability, and Catalysis.,Schmidt D, Serra I, Mlynek G, Pfanzagl V, Hofbauer S, Furtmuller PG, Djinovic-Carugo K, Van Doorslaer S, Obinger C Biochemistry. 2021 Mar 2;60(8):621-634. doi: 10.1021/acs.biochem.0c00910. Epub , 2021 Feb 15. PMID:33586945<ref>PMID:33586945</ref> | ||
| + | |||
| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 7ati" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
| + | [[Category: Cyanothece sp. PCC 7425]] | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: Djinovic-Carugo K]] | [[Category: Djinovic-Carugo K]] | ||
Current revision
Crystal structure of dimeric chlorite dismutase variant Q74V (CCld Q74V) from Cyanothece sp. PCC7425
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