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As a key mechanism underpinning many biological processes, protein self-organization has been extensively studied. However, the potential to apply the distinctive, nonlinear biochemical properties of such self-organizing systems to biotechnological problems such as the facile detection and characterization of biomolecular interactions has not yet been explored. Here, we describe an in vitro assay in a 96-well plate format that harnesses the emergent behavior of the Escherichia coli Min system to provide a readout of biomolecular interactions. Crucial for the development of our approach is a minimal MinE-derived peptide that stimulates MinD ATPase activity only when dimerized. We found that this behavior could be induced via any pair of foreign, mutually binding molecular entities fused to the minimal MinE peptide. The resulting MinD ATPase activity and the spatiotemporal nature of the produced protein patterns quantitatively correlate with the affinity of the fused binding partners, thereby enabling a highly sensitive assay for biomolecular interactions. Our assay thus provides a unique means of quantitatively visualizing biomolecular interactions and may prove useful for the assessment of domain interactions within protein libraries and for the facile investigation of potential inhibitors of protein-protein interactions.

Probing Biomolecular Interactions by a Pattern-Forming Peptide–Conjugate Sensor