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What determines the success of isomerization of the Photoactive Yellow Protein chromophore? – A picosecond pump-probe study in the midIR

L.J.G.W. van Wilderen, I.H.M. van Stokkum, R. van Grondelle, M.L. Groot, M.A. van der Horst, and K.J. Hellingwerf

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Abstract

We have measured the mid-infrared absorption-difference spectra of PYP photocycle intermediates representing successful and unsuccessful attempts to enter the signaling state. It appears that breaking of the chromophores hydrogen bond with Cys69 is decisive.

© 2006 Optical Society of America

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