Journal
CHEMICAL PHYSICS
Volume 512, Issue -, Pages 116-121Publisher
ELSEVIER
DOI: 10.1016/j.chemphys.2018.02.003
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Funding
- Deutsche Forschungsgemeinschaft (the cluster of excellence 'Munich-Center for Advanced Photonics, MAP')
- Deutsche Forschungsgemeinschaft ('Center for Integrated Protein Science, CIPSM')
- Deutsche Forschungsgemeinschaft [SFB 749]
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The light triggered unfolding reaction of the azobenzene peptide AzoTrpZip2 is investigated from 1 ps to 100 mu s. Absorption changes show that the unfolding is a multistep process with the initial breaking of the hydrogen bonds in the vicinity of the AMPP chromophore on the 1 ns time scale followed by the disappearance of the remaining interstrand hydrogen bonds of the native hairpin structure with a 1.9 mu s process. Subsequently, the hydrophobic core structure still stabilising a hairpin-like pattern rearranges in a 17 mu s process. The strong slowing down of this reaction at lower temperature points to a barrier height in the range of 60 kJ/mol. (C) 2018 Published by Elsevier B.V.
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