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Controllable protein-based machines and materials are of considerable interest for diverse biotechnological applications. We previously re-engineered an ATP-driven protein machine, a group II chaperonin, to function as a light-gated nanocage. Here we develop and test a model for the molecular mechanism of the re-engineered chaperonin, which undergoes a large-scale closed to open conformational change...
The effect of ionic strength on the conformational equilibrium between the I2 intermediate and the signaling state I′2 of the photoreceptor PYP and on the rate of recovery to the dark state were investigated by time-resolved absorption and fluorescence spectroscopy. With increasing salt concentration up to ∼600mM, the recovery rate k3 decreases and the I2/I′2 equilibrium (K) shifts in the direction...
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