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'Flipping the switch' reveals new compounds with antibiotic potential
Date:10/31/2013

oaches there's not that much left to be discovered. But now that we can change the genome-wide expression of fungi, we may see a whole new range of compounds we didn't even know existed."

The gene that was deleted in this case regulates the methylation of histones, the proteins around which DNA is wound, Freitag said. Creating a mutant without this gene allowed new expression, or overexpression of about 25 percent of the genome of this fungus, and the formation of many "secondary metabolites," the researchers found.

The gene that was deleted, kmt6, encodes a master regulator that affects the expression of hundreds of genetic pathways, researchers say. It's been conserved through millions of years, in life forms as diverse as plants, fungi, fruit flies and humans.

The discovery of new antibiotics is of increasing importance, researchers say, as bacteria, parasites and fungi are becoming increasingly resistant to older drugs.

"Our studies will open the door to future precise 'epigenetic engineering' of gene clusters that generate bioactive compounds, e.g. putative mycotoxins, antibiotics and industrial feedstocks," the researchers wrote in the conclusion of their report.


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Contact: Michael Freitag
freitagm@science.oregonstate.edu
541-737-4845
Oregon State University
Source:Eurekalert  

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