1eyp
From Proteopedia
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|SITE= | |SITE= | ||
|LIGAND= | |LIGAND= | ||
| - | |ACTIVITY= [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] | + | |ACTIVITY= <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> |
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1eyq|1EYQ]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1eyp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eyp OCA], [http://www.ebi.ac.uk/pdbsum/1eyp PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1eyp RCSB]</span> | ||
}} | }} | ||
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[[Category: chalcone isomerase]] | [[Category: chalcone isomerase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:12:17 2008'' |
Revision as of 17:12, 30 March 2008
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| , resolution 2.5Å | |||||||
|---|---|---|---|---|---|---|---|
| Activity: | Chalcone isomerase, with EC number 5.5.1.6 | ||||||
| Related: | 1EYQ
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CHALCONE ISOMERASE
Overview
Chalcone isomerase (CHI) catalyzes the intramolecular cyclization of chalcone synthesized by chalcone synthase (CHS) into (2S)-naringenin, an essential compound in the biosynthesis of anthocyanin pigments, inducers of Rhizobium nodulation genes, and antimicrobial phytoalexins. The 1.85 A resolution crystal structure of alfalfa CHI in complex with (2S)-naringenin reveals a novel open-faced beta-sandwich fold. Currently, proteins with homologous primary sequences are found only in higher plants. The topology of the active site cleft defines the stereochemistry of the cyclization reaction. The structure and mutational analysis suggest a mechanism in which shape complementarity of the binding cleft locks the substrate into a constrained conformation that allows the reaction to proceed with a second-order rate constant approaching the diffusion controlled limit. This structure raises questions about the evolutionary history of this structurally unique plant enzyme.
About this Structure
1EYP is a Single protein structure of sequence from Medicago sativa. Full crystallographic information is available from OCA.
Reference
Structure and mechanism of the evolutionarily unique plant enzyme chalcone isomerase., Jez JM, Bowman ME, Dixon RA, Noel JP, Nat Struct Biol. 2000 Sep;7(9):786-91. PMID:10966651
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