Aflatoxin and deconstruction of type I, iterative polyketide synthase function

Area of Science:

• Natural Product Chemistry
• Biochemistry
• Synthetic Biology

Background:

• Aflatoxins are highly rearranged polyketide natural products with complex biosynthesis.
• Understanding the enzymatic machinery is crucial for controlling aflatoxin production and exploring novel compounds.

Purpose of the Study:

• To provide fundamental chemical insights into aflatoxin biosynthesis.
• To develop novel strategies for dissecting and re-engineering complex biosynthetic enzymes.
• To explore the potential for creating non-natural products through rational enzyme design.

Main Methods:

• Deep analysis of aflatoxin biosynthesis pathways.
• Application of bioinformatic tools to identify protein structures.
• Development of experimental strategies for enzyme dissection and reassembly.
• Rational engineering of polydomain enzymes.

Main Results:

• Elucidation of cytochrome P450-mediated skeletal rearrangements via cationic intermediates and oxidative dearomatizations.
• Identification of linker regions in large, polydomain proteins.
• Deduction of individual catalytic roles and coordination of overall synthesis.
• Successful re-engineering of enzymes to produce non-natural products.

Conclusions:

• Fundamental chemical insights into aflatoxin biosynthesis have been achieved.
• Innovative bioinformatic and experimental approaches overcome limitations of traditional methods.
• Rational enzyme engineering offers a powerful strategy for generating novel natural products.