Glassy dynamics and memory effects in an intrinsically disordered protein construct

Ian Morgan, Ram Avinery, Gil Rahamim, Roy Beck & Omar Saleh
Glassy, nonexponential relaxations in globular proteins are typically attributed to conformational behaviors that are missing from intrinsically disordered proteins. Yet, we show that single molecules of a disordered-protein construct display two signatures of glassy dynamics, logarithmic relaxations and a Kovacs memory effect, in response to changes in applied tension. We attribute this to the presence of multiple independent local structures in the chain, which we corroborate with a model that correctly predicts the force-dependence of...
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