Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Quantum Control (with MO)

Q 62.3: Talk

Friday, March 12, 2010, 11:00–11:15, F 102

New studies on photo induced bond breaking in model peptides — •Ihar Shchatsinin, Nickolai Zhavoronkov, Ingolf Volker Hertel, and Claus Peter Schulz — Max Born Institute, Max-Born-Str. 2A, D-12489 Berlin, Germany

Small peptides possessing a -CO-NH-CHR-CO- moiety may be regarded as “model peptides”. Recently we have reported the experimental results on specific bond breaking in the one of them (Ac-Phe-NHMe) using the pulse shaping technique [1]. We have shown ability to cleave the peptide bond in this molecule preferentially with shaped femtosecond laser pulses, while keeping other more labile bonds intact [2]. These results demonstrate the potential of the pulse shaping technique and can be considered as a first move toward an analytic tool for protein sequencing. As a step further now we present detailed investigations of selective bond breaking using other model peptides. Studies on different chromophores and backbone structures provide new information about the photo induced bond breaking phenomena in model peptides. The photo physical and photo chemical mechanisms involved in the observed phenomena will be discussed in this contribution.

[1] T. Laarmann, I. Shchatsinin, P. Singh, N. Zhavoronkov, M. Gerhards, C.P. Schulz, I.V. Hertel, J. Chem. Phys. 127, 201101 (2007)

[2] T. Laarmann, I. Shchatsinin, P. Singh, N. Zhavoronkov, C.P. Schulz, I.V. Hertel, J. Phys. B 41, 074005 (2008)