Connecting cluster dynamics and protein folding
The University of Chicago, Chicago, Illinois 60637, USA
2 Instituto de Matematica, Universidad Nacional del Sur, Bahia Blanca, Argentina
Corresponding author: a firstname.lastname@example.org
Published online: 15 September 2001
The relaxation dynamics of clusters can be interpreted in terms of the topographies of their potential surfaces. Systems with short-range potentials have sawtooth-like potential surfaces with small drops in energy from one local minimum to the next and few-body motions as the clusters move from one minimum to another; such systems readily take on amorphous structures. These are called "glass-formers". Systems with long-range forces have potentials whose topographies are like rough staircases, with some large drops in energy from one minimum to the next; their well-to-well passages involve very collective motions and such systems are excellent structure-seekers. They find their way to well-ordered, highly selective structures under almost all circumstances. These characteristics generalize to describe the potential surfaces and folding behavior of polypeptides and proteins. The forces are effective long-range forces due to the polymer chain. Staircase topographies emerge both from direct sampling of potential surfaces and from the inversion of the kinetics generated by a much more abstract topological model, from which folding pathways can be inferred.
PACS: 36.40.-c – Atomic and molecular clusters / 87.10.+e – General theory and mathematical aspects / 87.15.-v – Biomolecules: structure and physical properties
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001