Thermodynamic features characterizing good and bad folding sequences obtained using a simplified off-lattice protein model

Andrea Amatori, Jesper Ferkinghoff-Borg, Guido Tiana, Ricardo A. Broglia

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The thermodynamics of the small SH3 protein domain is studied by means of a simplified model where each beadlike amino acid interacts with the others through a contact potential controlled by a 2020 random matrix. Good folding sequences, characterized by a low native energy, display three main thermodynamical ensembles, namely, a coil-like ensemble, an unfolded globule, and a folded ensemble plus two other states, frozen and random coils, populated only at extreme temperatures. Interestingly, the unfolded globule has some regions already structured. Poorly designed sequences, on the other hand, display a wide transition from the random coil to a frozen state. The comparison with the analytic theory of heteropolymers is discussed
Original languageEnglish
JournalPhysical Review E. Statistical, Nonlinear, and Soft Matter Physics
Volume73
ISSN1063-651X
DOIs
Publication statusPublished - 2006
Externally publishedYes

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