In this contribution, I will discuss our recent work on charge-transport through self-assembled ensembles of the trimeric protein complex, photosystem I (PSI). These remarkable complexes form robust junctions that can be printed and wired into integrated circuits. Current is mediated by long-range tunneling across the complexes, the orientation of which determines their function; in the "up" or "down" position they exhibit temperature-independent current-rectification. Mixing these orientations leads to no rectification. Thus, by controlling the self-assembly process, all-protein logic circuits can be printed onto flexible substrates with yields approaching 100%. These logic circuits operate at speeds of at least 3 kHz.
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