Photo-lysine is primarily used in biochemical research to study protein interactions and dynamics. It serves as a photoactivatable amino acid that can be incorporated into proteins, allowing researchers to trigger specific reactions or cross-linking events upon exposure to light. This property is particularly useful in mapping protein-protein interactions, understanding protein folding, and investigating cellular processes in real-time. Additionally, photo-lysine is employed in the development of advanced imaging techniques, enabling precise control over biological systems for experimental purposes. Its application extends to the field of photopharmacology, where light-sensitive compounds are used to regulate biological activity with high spatial and temporal resolution.