Dresden 2011 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 11: Posters: Single-Molecule Biophysics

BP 11.1: Poster

Montag, 14. März 2011, 17:15–20:00, P3

High Resolution Optical Tweezers for Single-Molecule Studies of Eukaryotic Transcription — •Korbinian Paul, Adam Muschielok, Noemi Maria Porcellato, and Jens Michaelis — Department für Chemie LMU München, Butenandstr. 5-13

Investigating mechanical aspects of single RNA polymerases will further our understanding of the molecular mechanism of transcription elongation. For these single-molecule experiments we establish a high resolution optical tweezers setup in the dual trap design, where one trap is moveable by a piezo-driven mirror. Experiments with 5 kbp DNA tethers attached to trapped beads have shown that our current resolution is about 0.5 nm for forces measured around 15 pN at a time resolution of approximately 0.1s. This is sufficient to study single base pair steps of RNA Polymerase II on DNA. In further experiments we will investigate the behavior of RNA Polymerases I and II from a mechanical perspective. In addition, we will study transcription regulation by performing experiments in presence of different transcription factors such as TFIIS and TFIIF.