Role of hydration force in the self-assembly of collagens and amyloid steric zipper filaments.

ABSTRACT: In protein self-assembly, types of surfaces determine the force between them. Yet the extent to which the surrounding water contributes to this force remains as a fundamental question. Here we study three self-assembling filament systems that respectively have hydrated (collagen), dry nonpolar, and dry polar (amyloid) interfaces. Using molecular dynamics simulations, we calculate and compare local hydration maps and hydration forces. We find that the primary hydration shells are formed all over the surface, regardless of the types of the underlying amino acids. The weakly oscillating hydration force arises from coalescence and depletion of hydration shells as two filaments approach, whereas local water diffusion, orientation, or hydrogen-bonding events have no direct effect. Hydration forc

SUBMITTER: Ravikumar KM 

PROVIDER: S-EPMC3145038 | biostudies-literature | 2011 Aug

REPOSITORIES: biostudies-literature