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BP: Fachverband Biologische Physik
BP 18: Single-Molecule Biophysics II
BP 18.3: Talk
Tuesday, March 15, 2011, 14:45–15:00, ZEU 250
Friction dynamics of peptides at polar and non-polar surfaces — •Aykut Erbas, Dominik Horinek, and Roland R. Netz — Technische Universitaet Muenchen, Physik Department, Garcing, Germany
The friction forces and mobilities for the C16 spider silk and various peptides on polar and non-polar surfaces are investigated using molecular dynamics simulations. For both surfaces, the velocity dependence of the monomer mobility is determined and interpreted with non-linear analytical models. The obtained diffusion coefficients are in good agreement with experiments. It is concluded that the reason for the high friction forces on polar surfaces is hydrogen bonding. It is further shown that each hydrogen bond contributes equally to the total friction force, independent of the concentration of surface-polar groups or the type of amino acid.