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• W2120518017 abstract "Native-state hydrogen exchange experiments on several proteins have revealed partially unfolded conformations with diverse stabilities. These equilibrium observations have been used to support kinetic arguments that folding proceeds via a sequential pathway. This interpretative logic is evaluated here by analyzing the relationship between thermodynamic behavior and folding kinetics in a class of simplified lattice protein models. The chain models studied have varying degrees of cooperative interplay (coupling) between local helical conformational preference and favorable nonlocal interactions. When model cooperativity is high, as native conditions are weakened, isotherms of free energy of exchange for residues belonging to the same helix merge together before global unfolding. The point of merger depends on the model energetic favorability of the helix. This trend is similar to the corresponding experimental observations. Kinetically, we find that the ordering of helix formation in the very last stage of native core assembly tends to follow the stabilities of their converged isotherms. In a majority (but not all) of folding trajectories, the final assembly of helices that are thermodynamically more stable against exchange precedes that of helices that are less stable against exchange. These model features are in partial agreement with common experimental interpretations. However, the model results also underscore the ensemble nature of the folding process: the kinetics of helix formation is not a discrete, strictly all-or-none process as that envisioned by certain non-explicit-chain models. Helices generally undergo many cycles of partial formation and dissolution before their conformations are fixed in the final assembly stage of folding, a kinetic stage that takes up only approximately 2% of the average folding time in the present model; and the ordering of the helices' final assembly in some trajectories can be different from the dominant ordering stipulated by the exchange isotherms." @default.
• W2120518017 created "2016-06-24" @default.
• W2120518017 creator A5040427080 @default.
• W2120518017 creator A5053481856 @default.
• W2120518017 date "2004-10-05" @default.
• W2120518017 modified "2023-10-16" @default.
• W2120518017 title "Explicit-chain model of native-state hydrogen exchange: Implications for event ordering and cooperativity in protein folding" @default.
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• W2120518017 doi "https://doi.org/10.1002/prot.20286" @default.
• W2120518017 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15468168" @default.
• W2120518017 hasPublicationYear "2004" @default.
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