Regensburg 2010 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 28: Focus: Charge Effects in Soft and Biological Matter II (joint CPP, BP, ST)
BP 28.3: Vortrag
Donnerstag, 25. März 2010, 14:45–15:00, H37
On the Question of Universality of Charge Induced Reentrant Condensation of Proteins — •Fajun Zhang1, Benjamin Heck1, Marcell Wolf1, Luca Ianeselli1, Michael Ziller1, Maximilian W. A. Skoda2, Robert M. J. Jacobs3, Oliver Kohlbacher4, Sophie Weggler5, Andreas Hildbrandt5, and Frank Schreiber1 — 1Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany — 2ISIS, Rutherford Appleton Laboratory, UK — 3Department of Chemistry, CRL, University of Oxford, UK — 4Zentrum für Bioinformatik Tübingen, Tübingen, Germany — 5Zentrum für Bioinformatik Saar, Saarbrücken, Germany
The effective interactions and phase behavior of protein solutions under strong electrostatic coupling conditions are a challenge to our understanding due to the complex charge pattern and irregular geometry of protein surfaces, which distinguishes them from related systems such as DNA or conventional colloids. In this work, we discuss the question of the universality of the reentrant condensation (RC) of proteins in solution induced by multivalent counterions, i.e. redissolution upon adding further salts after phase separation, as recently discovered [1]. The discussion is based on a systematic investigation of five different proteins with different charge patterns with five typical multivalent counterions. Zeta potential measurements confirm the effective charge inversion of proteins in the reentrant regime via binding of multivalent counterions. [1] F. Zhang, et al., Phys. Rev. Lett. 2008, 101, 148101.