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Structural elucidation of chalcone reductase and implications for deoxychalcone biosynthesis
Erin K Bomati1, Michael B Austin, Marianne E Bowman
1Jack Skirball Chemical Biology and Proteomics Laboratory, Salk Institute for Biological Studies, La Jolla, California 92037, USA
The Journal of Biological Chemistry
|June 23, 2005
Summary
Researchers identified the substrate for chalcone reductase, a key enzyme in flavonoid biosynthesis. This finding, based on structural analysis, clarifies the pathway and provides a template for understanding related enzymes.
Area of Science:
- Biochemistry
- Structural Biology
- Plant Science
Background:
- Flavonoids and isoflavonoids are vital plant compounds.
- Deoxychalcone formation requires chalcone synthase and chalcone reductase.
- The specific substrate for chalcone reductase has been unknown.
Purpose of the Study:
- To determine the three-dimensional structure of alfalfa chalcone reductase.
- To identify the substrate and binding mode of chalcone reductase.
- To provide structural insights into the aldo/keto reductase superfamily.
Main Methods:
- X-ray crystallography of alfalfa chalcone reductase bound to NADP+.
- Computer-assisted docking to evaluate potential substrates.
- Structural comparison with other reductase enzymes.
Main Results:
- The structure of alfalfa chalcone reductase (NADPH-bound) was determined.
- The non-aromatized coumaryl-trione intermediate is proposed as the substrate.
- Chalcone reductase shares structural similarity with the aldo/keto reductase superfamily.
Conclusions:
- The study identifies the chalcone reductase substrate, clarifying a key step in flavonoid biosynthesis.
- The structure provides a template for homology modeling of aldo/keto reductase 4 family members.
- Convergent functional evolution is supported between fatty acid and polyketide ketoreductases.