The first protease-focused, DNA-encoded chemical library for drug discovery

Baylor College of Medicine is advancing the field of drug discovery with a novel approach to identify compounds that could be the starting point in the development of new drugs for various illnesses and conditions.

DNA-encoded Chemistry Technology (DEC-Tec) at Baylor’s Center for Drug Discovery

Dr. Surendra Dawadi, instructor in the Center for Drug Discovery at Baylor, and Dr. Martin M. Matzuk, professor and chair of the Department of Pathology & Immunology and director of the Center for Drug Discovery led this project. The new approach is quite timely as it can support the development of novel antiviral drugs for use in the fight against the ongoing COVID-19 pandemic.

Dr. Surendra Dawadi

“The study demonstrates that a powerful drug discovery approach, DNA-encoded chemical library technology, can be successfully used for the discovery of drug-like small molecules to inhibit some classes of protease enzymes, which are involved in various processes related to disease or injury,” said Dawadi.

A novel approach to drug discovery

Although DNA-encoded chemical library technology for drug discovery has existed for more than 20 years, Baylor researchers developed new chemical methods to synthesize structurally focused chemical libraries designed to possess high affinity for a particular class of protein targets, in this case proteases. Proteases, enzymes that catalyze the hydrolysis or breaking down of peptidic bonds in proteins, have been an intensely studied class of targets for drug discovery due to their involvement in various biological processes that lead to disease.

To rapidly identify small-molecule lead compounds to target healthcare-associated proteases, the researchers constructed a 9.8 million membered protease-focused, DNA-encoded chemical library, the first example of this type of library. To evaluate this library, the team focused on thrombin, a common protease, and found an inhibitor of thrombin that is 10-fold more potent than some clinical compounds.

“This finding means that our collaborative team of medicinal chemists, biochemists and computational scientists can use this focused library approach to identify potential drug targets for other proteases, including those that play essential roles in infectious diseases,” Matzuk said.

Because a few proteases have been shown to be relevant to how COVID-19 develops, similar screens of this and currently developed protease-focused DNA-encoded chemical libraries are critical and ongoing to develop novel antiviral drugs,” Matzuk said.

These findings also have implications for health issues where no drugs exist, such as male contraception.

Find all the details of this work in the Proceedings of the National Academy of Sciences USA.

Other Baylor College of Medicine co-authors on this paper are Nicholas Simmons, Gabriela Miklossy, Kurt M. Bohren, John C. Faver, Melek Nihan Ucisik, Pranavanand Nyshadham and Zhifeng Yu.

Funding for the study is provided by the Eunice Kennedy Shriver National Institute of Child Health and Human Development, the Bill and Melinda Gates Foundation, the Welch Foundation, a Core Facility Support Award from the Cancer Prevention Research Institute of Texas and a COVID-19-relevant exploratory grant from Baylor College of Medicine.

 

By Graciela Gutierrez

 

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