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| | ==Crystal structure of Arabidopsis thaliana chalcone isomerase At3g55120 (AtCHI)== | | ==Crystal structure of Arabidopsis thaliana chalcone isomerase At3g55120 (AtCHI)== |
| - | <StructureSection load='4doi' size='340' side='right' caption='[[4doi]], [[Resolution|resolution]] 1.55Å' scene=''> | + | <StructureSection load='4doi' size='340' side='right'caption='[[4doi]], [[Resolution|resolution]] 1.55Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4doi]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Arath Arath]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4DOI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4DOI FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4doi]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4DOI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4DOI FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=NO3:NITRATE+ION'>NO3</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NO3:NITRATE+ION'>NO3</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4dok|4dok]], [[4dol|4dol]], [[4doo|4doo]]</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=4doi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4doi OCA], [https://pdbe.org/4doi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4doi RCSB], [https://www.ebi.ac.uk/pdbsum/4doi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4doi ProSAT]</span></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">At3g55120, CFI, CHI1, T15C9_120, TT5 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3702 ARATH])</td></tr>
| + | |
| - | <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>
| + | |
| - | <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=4doi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4doi OCA], [http://pdbe.org/4doi PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4doi RCSB], [http://www.ebi.ac.uk/pdbsum/4doi PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4doi ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CFI1_ARATH CFI1_ARATH]] Catalyzes the intramolecular cyclization of bicyclic chalcones into tricyclic (S)-flavanones. Responsible for the isomerization of 4,2',4',6'-tetrahydroxychalcone (also termed chalcone) into naringenin.<ref>PMID:1354004</ref> | + | [[https://www.uniprot.org/uniprot/CFI1_ARATH CFI1_ARATH]] Catalyzes the intramolecular cyclization of bicyclic chalcones into tricyclic (S)-flavanones. Responsible for the isomerization of 4,2',4',6'-tetrahydroxychalcone (also termed chalcone) into naringenin.<ref>PMID:1354004</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Arath]] | + | [[Category: Arabidopsis thaliana]] |
| - | [[Category: Chalcone isomerase]] | + | [[Category: Large Structures]] |
| - | [[Category: Bowman, M E]] | + | [[Category: Bowman ME]] |
| - | [[Category: Louie, G V]] | + | [[Category: Louie GV]] |
| - | [[Category: Noel, J P]] | + | [[Category: Noel JP]] |
| - | [[Category: Chalcone-flavanone isomerase]]
| + | |
| - | [[Category: Isomerase]]
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| Structural highlights
Function
[CFI1_ARATH] Catalyzes the intramolecular cyclization of bicyclic chalcones into tricyclic (S)-flavanones. Responsible for the isomerization of 4,2',4',6'-tetrahydroxychalcone (also termed chalcone) into naringenin.[1]
Publication Abstract from PubMed
Specialized metabolic enzymes biosynthesize chemicals of ecological importance, often sharing a pedigree with primary metabolic enzymes. However, the lineage of the enzyme chalcone isomerase (CHI) remained unknown. In vascular plants, CHI-catalysed conversion of chalcones to chiral (S)-flavanones is a committed step in the production of plant flavonoids, compounds that contribute to attraction, defence and development. CHI operates near the diffusion limit with stereospecific control. Although associated primarily with plants, the CHI fold occurs in several other eukaryotic lineages and in some bacteria. Here we report crystal structures, ligand-binding properties and in vivo functional characterization of a non-catalytic CHI-fold family from plants. Arabidopsis thaliana contains five actively transcribed genes encoding CHI-fold proteins, three of which additionally encode amino-terminal chloroplast-transit sequences. These three CHI-fold proteins localize to plastids, the site of de novo fatty-acid biosynthesis in plant cells. Furthermore, their expression profiles correlate with those of core fatty-acid biosynthetic enzymes, with maximal expression occurring in seeds and coinciding with increased fatty-acid storage in the developing embryo. In vitro, these proteins are fatty-acid-binding proteins (FAPs). FAP knockout A. thaliana plants show elevated alpha-linolenic acid levels and marked reproductive defects, including aberrant seed formation. Notably, the FAP discovery defines the adaptive evolution of a stereospecific and catalytically 'perfected' enzyme from a non-enzymatic ancestor over a defined period of plant evolution.
Evolution of the chalcone-isomerase fold from fatty-acid binding to stereospecific catalysis.,Ngaki MN, Louie GV, Philippe RN, Manning G, Pojer F, Bowman ME, Li L, Larsen E, Wurtele ES, Noel JP Nature. 2012 May 13;485(7399):530-3. doi: 10.1038/nature11009. PMID:22622584[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Shirley BW, Hanley S, Goodman HM. Effects of ionizing radiation on a plant genome: analysis of two Arabidopsis transparent testa mutations. Plant Cell. 1992 Mar;4(3):333-47. PMID:1354004 doi:http://dx.doi.org/10.1105/tpc.4.3.333
- ↑ Ngaki MN, Louie GV, Philippe RN, Manning G, Pojer F, Bowman ME, Li L, Larsen E, Wurtele ES, Noel JP. Evolution of the chalcone-isomerase fold from fatty-acid binding to stereospecific catalysis. Nature. 2012 May 13;485(7399):530-3. doi: 10.1038/nature11009. PMID:22622584 doi:10.1038/nature11009
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