Molecular dynamics of folding of secondary structures in Go-type models of proteins

T. X. Hoang,M. Cieplak

Published 1999 in Journal of Chemical Physics

ABSTRACT

We consider six different secondary structures of proteins and construct two types of Go-type off-lattice models: with the steric constraints and without. The basic amino acid–amino acid potential is Lennard–Jones for the native contacts and a soft repulsion for the non-native contacts. The interactions are chosen to make the target secondary structure be the native state of the system. We provide a thorough equilibrium and kinetic characterization of the sequences through the molecular dynamics simulations with the Langevin noise. Models with the steric constraints are found to be better folders and to be more stable, especially in the case of the β structures. Phononic spectra for vibrations around the native states have low frequency gaps that correlate with the thermodynamic stability. Folding of the secondary structures proceeds through a well-defined sequence of events. For instance, α helices fold from the ends first. The closer to the native state, the faster establishment of the contacts. Increas...

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