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Protein coacervates serve as hubs to concentrate and sequester proteins and nucleotides and thus function as membraneless organelles to manipulate cell physiology. We have engineered a coacervating protein to create tunable, synthetic membraneless organelles that assemble in response to a single pulse of light. Coacervation is driven by the intrinsically disordered RGG domain from the protein LAF-1, and opto-responsiveness is coded by the protein PhoCl, which cleaves in response to 405 nm light. We developed a fusion protein containing a