Heterogeneity in Regeneration of Bacteriorhodopsin from Bacterio-Opsin and All-<i>trans</i>Retinal at High Temperatures: Implications for Dynamic Structural Fluctuations

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  • SUGIYAMA Hiroyuki
    Department of Applied Physics, Graduate School of Engineering, Nagoya University
  • SONOYAMA Masashi
    Department of Applied Physics, Graduate School of Engineering, Nagoya University
  • GHIMIRE Ganga D.
    Department of Biotechnology, Tokyo University of Agriculture and Technology
  • MITAKU Shigeki
    Department of Applied Physics, Graduate School of Engineering, Nagoya University Department of Biotechnology, Tokyo University of Agriculture and Technology

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  • Heterogeneity in Regeneration of Bacteriorhodopsin from Bacterio-Opsin and All-trans Retinal at High Temperatures: Implications for Dynamic Structural Fluctuations

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Measurements of regeneration kinetics were performed in order to investigate the regeneration mechanisms of bacteriorhodopsin (bR) from thermally unfolded bacterio-opsin (bO) and all-trans retinal. Regeneration kinetics data were successfully fitted to a single exponential function when regeneration was performed at 25 °C after incubation at high temperatures. Conversely, the process of regeneration after the addition of retinal to bO at high temperatures occurred at two different rate constants. These findings strongly suggest that the slower regeneration of bR at high temperatures occurs as a result of dynamic structural fluctuation of bO, whereas the faster process corresponds to regeneration from bO, which retains a native structure capable of retinal binding.

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