Genome mining for new enediyne antibiotics

Area of Science:

• Natural Product Chemistry
• Molecular Biology
• Genomics

Background:

• Enediyne antibiotics are complex natural products with potent DNA-cleavage activity.
• Microbial genomes contain numerous enediyne biosynthetic gene clusters (BGCs), but many remain silent or underexpressed.
• Fewer than two dozen enediyne natural products have been characterized despite the abundance of BGCs.

Purpose of the Study:

• To review recent strategies for discovering novel enediyne natural products.
• To highlight methods for overcoming challenges in accessing silent BGCs.
• To emphasize the potential for new enediyne discoveries and understanding their biosynthesis.

Main Methods:

• Phenotypic screening from rare microbial sources.
• Biosynthetic manipulation of BGCs.
• Genomic signature-based PCR screening.
• DNA-cleavage assays combined with high-throughput elicitor screening for silent BGC activation.

Main Results:

• Identification of four distinct strategies for novel enediyne discovery.
• Demonstration of methods to access previously uncharacterized enediynes.
• Highlighting the success of combining genomic data with functional assays.

Conclusions:

• Emerging approaches are effectively unlocking the vast reservoir of enediyne BGCs.
• New enediyne natural products are imminent with further insights into their biogenesis.
• Nature's chemical creativity in enediynes is being increasingly accessible for scientific exploration.