Abstract
In order to elucidate the folding dynamics of protein, we have carried out numerical simulations of a heteropolymer model of self-interacting random chains. We find that folding propensity depends strongly on sequence and that both folding and nonfolding sequences exist. Furthermore we show that folding is a two-step process: the transition from coil state to unique folded state takes place through a globule phase. In addition to the continuous coil-globule transition, there exists an abrupt transition that separates the unique folded state from the globule state and ensures the stability of the native state.
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