Universal barcodes unlock fast-paced small molecule synthesis

The development of molecules to study and treat disease is becoming increasingly burdened by the time and specificity required to analyze the vast amounts of data generated by synthesizing large collections of new molecules. Scientists at St. Jude Children’s Research Hospital present a novel solution to this problem, using the fundamental fragmentation patterns of chemical building blocks to barcode reactions from starting materials to products.

In doing so, they have removed a key bottleneck in the process of synthesizing and screening small molecules. Their work is published in Nature.

Current analytical methods lag the scale of rapid, high-throughput analysis desired by researchers. Scientists at St. Jude, led by Daniel Blair, Ph.D., St. Jude Department of Chemical Biology and Therapeutics, set about solving this problem by capitalizing on a general feature residing in most chemical reactions.

“Generality is essential for doing anything quickly. So, we sought to identify general features which would uniformly encode the analysis of small molecules,” explained Blair, corresponding author of the article.

“We discovered that the building blocks we use to create small molecules break apart in specific, predictable ways and that these patterns can then be used as universal barcodes to analyze chemical products.”

A fragmentation-first approach to experimental design

Fragmentation is a fundamental property of chemical matter, but this novel application in the realm of chemical synthesis is giving it new meaning. A general rate for analyzing a chemical reaction’s outcome is conventionally around 3 minutes, but as researchers scale up, analyzing additional reactions with more variables, that amount of time becomes impractical.

This work by Blair and the team transforms chemical reaction analysis from a slow, highly customized and specialist-driven method to a streamlined approach driven by simple-to-identify fragmentation barcodes and a single analytical readout.

“Because these fragmentation patterns are a fundamental property of chemical matter, they are reliably transposable from starting materials to products. As soon as you recognize that starting materials can define the analysis of the resulting chemical products, you’ve generalized the entire approach,” said first author Maowei Hu, Ph.D., St. Jude Department of Chemical Biology and Therapeutics.

This fragmentation-first approach to high-throughput experimental design can be applied in many ways because this fundamental property is not disease- or discipline-specific. Future applications may include the development of antibiotics, antifungals, cancer therapeutics, molecular glues and many more types of molecules.

“We’ve not only transformed the speed of chemical reaction analysis but also paved the way for directly utilizing these molecules to understand and combat diseases,” said Blair.

“This advance represents a significant milestone in our mission to develop effective therapies swiftly and efficiently. We’ve transformed chemical reaction analysis from minutes to milliseconds, and in doing so, have shifted the bottleneck from making molecules to finding functions.”