Abstract
A molecular robot is an autonomous micro/nano machine that mounts a molecular controller connecting the sensor and actuator systems. A major control problem of a molecular robot is to maintain the actuator operation at the desired level. This requires a regulator that adjusts the concentration of a specific DNA strand of a system to the desired level to be appropriately implemented on a chemical reaction system made of molecular interactions among DNA strands. However, although there are several research results on DNA concentration regulators, there is a major problem: the regulators normally work only within a limited period because of the finiteness problem of gate and fuel strands. The operating time of the controller is an important control performance index and is a prerequisite for its practical applications. In this study, the design of a renewable DNA concentration regulator simplified to an experimentally feasible level is proposed, inspired by the previously reported azobenzene-based photo-reaction method used for a renewable PID controller. It is shown that the methodology that timely switches the operation between “regulator mode” and “concentration recovery mode” by light irradiation can serve as a solution for the long-time operation of the DNA concentration regulator.
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Acknowledgements
We appreciate Mr. Minoru Akita (Kyushu Institute of Technology, graduated in March 2021) for discussing the design of the renewable DCR.
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This work was supported by JSPS KAKENHI Grant Numbers 20H05971 (T. N.), 20K04549 (T. N.), 20H05970 (K. M.), 20H05968 (K. M.), and JP21H05025 (H. A.).
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Nakakuki, T., Murayama, K. & Asanuma, H. DNA Concentration Regulator That can be Driven for a Long Time. New Gener. Comput. 40, 681–702 (2022). https://doi.org/10.1007/s00354-022-00173-3
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DOI: https://doi.org/10.1007/s00354-022-00173-3