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6big
From Proteopedia
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| - | '''Unreleased structure''' | ||
| - | + | ==Crystal structure of cobalt-substituted Synechocystis ACO== | |
| + | <StructureSection load='6big' size='340' side='right'caption='[[6big]], [[Resolution|resolution]] 2.21Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[6big]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Synechocystis_sp._PCC_6803_substr._Kazusa Synechocystis sp. PCC 6803 substr. Kazusa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6BIG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6BIG 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]] 2.21Å</td></tr> | ||
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CO:COBALT+(II)+ION'>CO</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=6big FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6big OCA], [https://pdbe.org/6big PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6big RCSB], [https://www.ebi.ac.uk/pdbsum/6big PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6big ProSAT]</span></td></tr> | ||
| + | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/ACOX_SYNY3 ACOX_SYNY3] Cleaves a number of carotenals and carotenols in the all-trans configuration at the 15-15' double bond producing retinal or retinol, respectively. Also shows activity toward lycopenals and the corresponding alcohols. Does not cleave beta-carotene or lycopene. | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Carotenoid cleavage oxygenases (CCO) are non-heme iron enzymes that catalyze oxidative cleavage of alkene bonds in carotenoid and stilbenoid substrates. Previously, we showed that the iron cofactor of CAO1, a resveratrol-cleaving member of this family, can be substituted with cobalt to yield a catalytically inert enzyme useful for trapping active site-bound stilbenoid substrates for structural characterization. Metal substitution may provide a general method for identifying the natural substrates for CCOs in addition to facilitating structural and biophysical characterization of CCO-carotenoid complexes under normal aerobic conditions. Here, we demonstrate the general applicability of cobalt substitution in a prototypical carotenoid cleaving CCO, apocarotenoid oxygenase (ACO) from Synechocystis. Among the non-native divalent metals investigated, cobalt was uniquely able to stably occupy the ACO metal binding site and inhibit catalysis. Analysis by X-ray crystallography and X-ray absorption spectroscopy demonstrate that the Co(II) forms of both ACO and CAO1 exhibit a close structural correspondence to the native Fe(II) enzyme forms. Hence, cobalt substitution is an effective strategy for generating catalytically inert but structurally intact forms of CCOs. | ||
| - | + | Preparation and characterization of metal-substituted carotenoid cleavage oxygenases.,Sui X, Farquhar ER, Hill HE, von Lintig J, Shi W, Kiser PD J Biol Inorg Chem. 2018 Aug;23(6):887-901. doi: 10.1007/s00775-018-1586-0. Epub, 2018 Jun 26. PMID:29946976<ref>PMID:29946976</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | [[Category: | + | </div> |
| - | [[Category: | + | <div class="pdbe-citations 6big" style="background-color:#fffaf0;"></div> |
| - | [[Category: Shi | + | == References == |
| - | [[Category: Sui | + | <references/> |
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Large Structures]] | ||
| + | [[Category: Synechocystis sp. PCC 6803 substr. Kazusa]] | ||
| + | [[Category: Kiser PD]] | ||
| + | [[Category: Shi W]] | ||
| + | [[Category: Sui X]] | ||
Current revision
Crystal structure of cobalt-substituted Synechocystis ACO
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