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Picosecond conformational transition of a cyclic peptide observed by infrared spectroscopy

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10 Author(s)
Sieg, A. ; Phys. Chem. Inst., Zurich Univ., Switzerland ; Schrada, T. ; Zinth, W. ; Wachtveitl, J.
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By visible-pump/infrared-probe spectroscopy, a cyclic octapeptide with a photoswitchable azobenzene based pseudo amino acid (AMPB) embedded in its backbone is investigated. The linear corresponding molecule is used as a reference. The AMPB molecule can be switched by light between a cis and trans conformation. NMR investigations on bcAMPB show an ensemble of a few structures for the cis state and a well defined one for the trans state. A visible pump pulse is used to start the conformational change by switching the AMPB from cis to trans. The probe pulse covers a range of 1600 cm-1 to 1750 cm-1 with a time resolution of 0.7 ps.

Published in:

Quantum Electronics Conference, 2003. EQEC '03. European

Date of Conference:

22-27 June 2003