Rice University engineers glowing cells to track protein changes in real time, transforming disease research.
Scientists at Rice University have engineered living cells to light up like tiny beacons, revealing protein changes in real time.This groundbreaking method could transform the way researchers study complex diseases, including cancer, without disrupting natural cellular processes.
By introducing a 21st amino acid into cells, the team made it possible to watch post-translational modifications—tiny chemical switches that control growth, aging, and disease—as they happen.The system works in bacteria, human cells, and even live tumor models, offering a safer and more precise alternative to traditional techniques.“This system lets us see the invisible choreography of proteins inside living cells,” said Han Xiao, the study’s corresponding author.“By equipping cells with the tools to produce and sense a new amino acid, we unlock a direct window into how PTMs drive biological processes in living animals.”The approach relies on engineering cells to produce a glowing version of lysine. When proteins are modified, the glow provides a visual signal, letting researchers monitor biological activity without breaking open cells or adding disruptive chemicals.Chromophoric proof conceptThe team harnessed enzymes to generate acetyllysine inside cells, then incorporated it into proteins at specific sites. Reporter proteins, including fluorescent proteins and enzymes, emitted light when modifications occurred.“This innovative method goes beyond previous approaches by eliminating the need for external chemicals and allowing us to watch protein changes happen naturally inside living cells,” Xiao said.The glowing sensors also let scientists study enzymes that regulate cellular behavior.For instance, the team examined SIRT1, a post-translational regulator linked to inflammation and cancer. Inhibiting SIRT1 blocked its activity but did not slow tumor growth in certain cell lines.“Seeing a glow in response to acetylation events inside living tissue was thrilling,” Xiao added. “It makes the invisible world of protein regulation vividly observable and opens new possibilities for studying disease mechanisms and drug actions.”Applications beyond cancerBeyond tumor research, the technique has broader applications. Because the system works in living organisms, it can track diseases or treatments in real time. Its light-based signals are ideal for large-scale drug screening targeting enzymes that control PTMs.Future enhancements may extend this approach to other post-translational modifications or human-derived organoid systems, paving the way for more personalized medicine and deeper insight into cellular regulation.“With this living sensor technology, our research offers an innovative tool that illuminates the dynamic world of PTMs, promising to reshape our understanding and treatment of diseases rooted in protein regulation by transforming invisible molecular signals into visible biological narratives,” said Yu Hu, the study’s first author.Supported by the SynthX Seed Award, National Institutes of Health, Robert A. Welch Foundation, U.S. Department of Defense, and the Robert J. Kleberg Jr. and Helen C. Kleberg Foundation, the study marks a significant step toward observing life’s invisible molecular choreography.
Bioengineering Cancer Research Glowing Cells Live-Cell Imaging Post-Translational Modifications Protein Tracking Rice University
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