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4c9t

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==BACTERIAL CHALCONE ISOMERASE IN open CONFORMATION FROM EUBACTERIUM RAMULUS AT 2.0 A RESOLUTION, SelenoMet derivative==
==BACTERIAL CHALCONE ISOMERASE IN open CONFORMATION FROM EUBACTERIUM RAMULUS AT 2.0 A RESOLUTION, SelenoMet derivative==
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<StructureSection load='4c9t' size='340' side='right' caption='[[4c9t]], [[Resolution|resolution]] 1.98&Aring;' scene=''>
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<StructureSection load='4c9t' size='340' side='right'caption='[[4c9t]], [[Resolution|resolution]] 1.98&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[4c9t]] is a 6 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4C9T OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4C9T FirstGlance]. <br>
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<table><tr><td colspan='2'>[[4c9t]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Eubacterium_ramulus Eubacterium ramulus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4C9T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4C9T FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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</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=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4c9t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4c9t OCA], [https://pdbe.org/4c9t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4c9t RCSB], [https://www.ebi.ac.uk/pdbsum/4c9t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4c9t ProSAT]</span></td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4c9s|4c9s]]</td></tr>
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<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Chalcone_isomerase Chalcone isomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.5.1.6 5.5.1.6] </span></td></tr>
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<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=4c9t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4c9t OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4c9t RCSB], [http://www.ebi.ac.uk/pdbsum/4c9t PDBsum]</span></td></tr>
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</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[[https://www.uniprot.org/uniprot/V9P0A9_EUBRA V9P0A9_EUBRA]]
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Flavonoids represent a large class of secondary metabolites produced by plants. These polyphenolic compounds are well known for their antioxidative abilities, are antimicrobial phytoalexins responsible for flower pigmentation to attract pollinators and, in addition to other properties, are also specific bacterial regulators governing the expression of Rhizobium genes involved in root nodulation (Firmin et al., 1986). The bacterial chalcone isomerase (CHI) from Eubacterium ramulus catalyses the first step in a flavanone-degradation pathway by ring opening of (2S)-naringenin to form naringenin chalcone. The structural biology and enzymology of plant CHIs have been well documented, whereas the existence of bacterial CHIs has only recently been elucidated. This first determination of the structure of a bacterial CHI provides detailed structural insights into the key step of the flavonoid-degradation pathway. The active site could be confirmed by co-crystallization with the substrate (2S)-naringenin. The stereochemistry of the proposed mechanism of the isomerase reaction was verified by specific (1)H/(2)H isotope exchange observed by (1)H NMR experiments and was further supported by mutagenesis studies. The active site is shielded by a flexible lid, the varying structure of which could be modelled in different states of the catalytic cycle using small-angle X-ray scattering data together with the crystallographic structures. Comparison of bacterial CHI with the plant enzyme from Medicago sativa reveals that they have unrelated folds, suggesting that the enzyme activity evolved convergently from different ancestor proteins. Despite the lack of any functional relationship, the tertiary structure of the bacterial CHI shows similarities to the ferredoxin-like fold of a chlorite dismutase and the stress-related protein SP1.
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Structure and catalytic mechanism of the evolutionarily unique bacterial chalcone isomerase.,Thomsen M, Tuukkanen A, Dickerhoff J, Palm GJ, Kratzat H, Svergun DI, Weisz K, Bornscheuer UT, Hinrichs W Acta Crystallogr D Biol Crystallogr. 2015 Apr;71(Pt 4):907-17. doi:, 10.1107/S1399004715001935. Epub 2015 Mar 27. PMID:25849401<ref>PMID:25849401</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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== References ==
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<references/>
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Chalcone isomerase]]
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[[Category: Eubacterium ramulus]]
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[[Category: Hinrichs, W]]
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[[Category: Large Structures]]
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[[Category: Palm, G J]]
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[[Category: Hinrichs W]]
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[[Category: Thomsen, M]]
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[[Category: Palm GJ]]
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[[Category: Flavonoid]]
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[[Category: Thomsen M]]
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[[Category: Isomerase]]
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Current revision

BACTERIAL CHALCONE ISOMERASE IN open CONFORMATION FROM EUBACTERIUM RAMULUS AT 2.0 A RESOLUTION, SelenoMet derivative

PDB ID 4c9t

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