We report a realization of an associative memory signal/information processing system based on simple enzyme-catalyzed biochemical reactions. Optically detected chemical output is always obtained in response to the triggering input, but the system can also “learn” by association, to later respond to the second input if it is initially applied in combination with the triggering input as the “training” step. This second chemical input is not self-reinforcing in the present system, which therefore can later “unlearn” to react to the second input if it is applied several times on its own. Such processing steps realized with (bio)chemical-kinetics promise applications of bio-inspired/memory-involving components in “networked” (concatenated) biomolecular processes for multi-signal sensing and complex information processing.

V. Bocharova, K. MacVittie, S. Chinnapareddy, J. Halámek, V. Privman, E. Katz, Realization of associative memory in an enzymatic process: Toward biomolecular networks with learning and unlearning functionalities. J. Phys. Chem. Lett. 2012, 3, 1234-1237.

A biomolecular system representing the first realization of associative memory based on enzymatic reactions in vitro has been designed. The system demonstrated “training” and “forgetting” features characteristic of memory in biological systems, but presently realized in simple biocatalytic cascades.

K. MacVittie, Jan Halámek, V. Privman, E. Katz, A bioinspired associative memory system based on enzymatic cascades. Chem. Commun. 2013, 49, 6962-6964.