Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 97: Organic/bio Molecules on Metal Surfaces IV
O 97.9: Vortrag
Freitag, 4. April 2014, 12:30–12:45, TRE Phy
Conformation Selection by Charge State Dependent Deposition of Unfolded Proteins — •Gordon Rinke1, Stephan Rauschenbach1, Ludger Harnau2,3, Alyazan Albarghash1, Mathias Pauly1, and Klaus Kern1,4 — 1Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, Stuttgart — 2Max- Planck-Institute for Intelligent Systems, Heisenbergstr. 3, Stuttgart — 3IV. Institute for Theoretical Physics, University Stuttgart, Pfaffenwaldring 57, Stuttgart — 4Institut de Physique de la Matiere Condensee, Ecole Polytechnique Federale de Lausanne, Switzerland
The conformation of polymers or proteins often define the electronic and mechanical properties of the single molecule just as well as the meso- and macro scale material properties. It is determined by the chemical interaction with itself and the environment in thermal equilibrium, which means that typically it cannot be addressed actively. Here we show that the conformation of unfolded Cytochrome proteins on a surface can be steered actively between fully extended and completely compact by electrospray ion beam deposition. The charge state and the deposition energy are free parameters in this approach, which can be used independently to control the molecules mechanical stiffness and the intensity of the collision. A quantitative analysis of the obtained conformations with scanning tunneling microscopy and molecular dynamics simulations show that, in addition to the initial gas phase conformation, the mechanical deformation during the ion surface-collision contributes significantly to the final conformation. Thus our methodology adds a new dimension to vacuum processing of molecules.