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Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 17: Focus: Droplets (joint session DY/CPP)

DY 17.4: Talk

Monday, March 12, 2018, 16:15–16:30, BH-N 334

Protein Interactions Control Dynamics Of Liquid Compartments — •Tyler S. Harmon1,2, Anthony A. Hyman2, and Frank Jülicher11Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany — 2Max Planck Institute for the Physics of Molecular Cell Biology, 01307 Dresden, Germany

Membraneless organelles form in cells due to liquid-liquid phase separation and have been implicated in a range of functions. The physical properties of these compartments are important for their function and thus should be tuned to match their intended purpose. Multiple diseases are associated with a hardening transition where these liquid compartments transition from a functional liquid-like state to an aberrant solid-like state over a long period of time. Other compartments appear to be designed to mature naturally from a liquid into a more solid compartment. Therefore, the physical mechanism controlling the liquid to solid transition is at the heart of how cells regulate and control these compartments.

We designed a three-dimensional polymer lattice model to investigate mechanisms for hardening in liquid compartments. We explore several mechanisms affecting the time dependence of protein dynamics. This allows us to test which protein properties are important for controlling the slowing of the dynamics of the liquid compartments. We analyzed the transition to a solid-like state by quantifying the time dependence of diffusion rates, density, and reversibility of dissolution. These results are a promising first step to reach a molecular picture of the hardening process.

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