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Understanding protein-protein interactions is key to unraveling protein function in vivo. Here we describe a dual/triple-plasmid system that enables co-expression of two, or three, recombinant proteins harboring different affinity tags in the same Escherichia coli cell. This novel protein expression system provides a platform to understand protein-protein interactions and enables researchers to study protein complex formation and in vivo localization.Single-stranded DNA (ssDNA)-binding protein (SS is essential for DNA metabolic proces