Expanding the scope of aromatic polyketides by combinatorial biosynthesis.

Area of Science:

• Biotechnology
• Molecular Biology
• Medicinal Chemistry

Background:

• Combinatorial biosynthesis merges genes for secondary metabolite production, aiding drug discovery.
• Streptomyces species are key microbial platforms for this technology due to their rich secondary metabolite production.
• Polyketides, a major class of natural products with diverse bioactivities, are central to this approach.

Purpose of the Study:

• To review the current state of combinatorial biosynthesis.
• To highlight its application in generating compound libraries and modifying natural products for drug discovery.
• To showcase anthracyclines as a case study for these applications.

Main Methods:

• Analysis of cloned biosynthetic gene clusters from natural product producers.
• Utilizing gene cassettes for flexible modification of polyketide structures.
• Leveraging enzyme flexibility for creating diverse compound libraries.

Main Results:

• Identification of nearly 30 cloned and characterized biosynthetic gene clusters for aromatic polyketides.
• Demonstration of enzyme flexibility enabling the creation of high-diversity compound libraries.
• Introduction of two gene cassettes for rapid and adaptable structural modification of polyketides.

Conclusions:

• Combinatorial biosynthesis is a powerful tool for drug discovery, offering rapid lead optimization and structural modification.
• The technology is applicable beyond anthracyclines, enabling broad structural diversification of natural products.
• Further development of gene cassettes and understanding enzyme flexibility will enhance the creation of novel therapeutics.