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Pathogen Assassin: Glycosylphosphatidylinositol Anchors, Trypanosome Biology, and Translational Drug Discovery
Overview
In this Royal Society Leeuwenhoek lecture, Mike Freemantle traces the journey from the first observations of microbes to the discovery of a central parasite surface feature, the glycosylphosphatidylinositol (GPI) anchor, and its role in shielding parasites such as African trypanosomes in the host bloodstream. The talk explains how a detailed biochemical dissection of the GPI anchor revealed a conserved eukaryotic membrane attachment mechanism and how this knowledge opened doors to new therapeutic strategies. Freemantle then follows the translational path from discovery science to medicines and diagnostics, highlighting the Dundee Drug Discovery Unit and collaborations that target diseases such as sleeping sickness, leishmaniasis, malaria, and tuberculosis. The piece also touches on training, infrastructure, and science policy shaping the field.
Overview
The talk presents a coherent narrative from basic parasite biology to translational drug discovery. It begins with a reminder that microbes power the carbon and nitrogen cycles while some cause deadly diseases. Freemantle introduces the African trypanosome as a model for examining how a parasite survives in the hostile host bloodstream, and then delves into the parasite's surface coat made of variant surface glycoproteins. The central question is what anchors these molecules to the membrane, a problem solved by identifying the glycosylphosphatidylinositol GPI anchor. The narrative then moves from structural chemistry to broader implications for eukaryotic membrane proteins and lipid rafts, and from fundamental biology to therapeutic opportunities. The presentation demonstrates how these insights catalyze a translational program that blends basic science with pharmaceutical expertise to address neglected diseases.
