Dresden 2014 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 11: Posters: Cytoskeleton
BP 11.6: Poster
Dienstag, 1. April 2014, 09:30–12:30, P1
thermal fluctuation of branched biopolymers and resulting entropic force — •mohammadhosein razbin1,2, panayotis benetatos3, martin falcke4, and annette zippelius1,2 — 1Institute for Theoretical Physics, Georg-August University , Friedrich-Hund-Platz 1, 37077 Goettingen, Germany — 2Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, 37077, Goettingen, Germany — 3Department of Physics, Kyungpook National University, South Korea — 4Mathematical Cell Physiology, Max-Delbrück-Center for Molecular Medicine, Robert-Rössle-Straße 10, D-13092 Berlin, Germany
We consider branched structures of biopolymers, such as actin polymerized by Arp2/3. The polymers are modeled as weakly bending chains, which are grafted at one end and form branches at a given angle. we compute the thermal fluctuation of the endpoints and the resulting entropic forces on a flat membrane, restricting the fluctuations of the endpoints. The entropic forces are shown to depend sensitively not only on the persistence length but also on the geometry of the structure.