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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
Published on: August 14, 2019
Engineering isoflavone metabolism with an artificial bifunctional enzyme
1Plant Biology Division, Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73401, USA.
Planta
|February 17, 2006
Summary
Researchers engineered a bifunctional enzyme to enhance isoflavonoid production in plants. This protein engineering approach successfully increased genistein levels in transgenic tobacco, simplifying metabolic engineering for valuable compounds.
Area of Science:
- Biochemistry
- Plant Science
- Metabolic Engineering
Background:
- Plant secondary metabolites, particularly isoflavonoids, are crucial for plant defense and have significant applications in human medicine and nutrition.
- Manipulating plant secondary metabolite biosynthesis is essential for optimizing the production of valuable compounds.
- Existing methods for engineering complex metabolic pathways can be cumbersome, necessitating simpler approaches.
Purpose of the Study:
- To develop a novel protein engineering strategy for enhanced isoflavonoid biosynthesis.
- To construct and express a bifunctional isoflavone synthase/chalcone isomerase (IFS/CHI) enzyme.
- To increase the accumulation of isoflavonoid compounds in non-legume plants.
Main Methods:
- Protein engineering via in-frame gene fusion to create a bifunctional IFS/CHI enzyme.
- Expression of the fusion protein in yeast and transgenic tobacco plants, with targeting to the endoplasmic reticulum (ER) membrane.
- Assaying enzymatic functions in yeast and quantifying isoflavonoid production in tobacco.
Main Results:
- The engineered bifunctional IFS/CHI enzyme retained individual enzymatic activities when assayed in yeast.
- Transgenic tobacco plants expressing IFS/CHI showed increased production of the isoflavonoid genistein and its glycosides compared to controls.
- The fusion protein was successfully targeted to the ER membrane in plant cells.
Conclusions:
- A combined approach of molecular modeling, in vitro protein engineering, and in planta metabolic engineering can effectively enhance isoflavonoid accumulation in plants.
- Bifunctional enzymes offer a simplified strategy for transforming plants with multiple pathway genes.
- Engineered bifunctional enzymes, especially those involving cytochrome P450s, have broad potential applications in biochemical pathway engineering.
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