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  • Title: Picosecond protein response to the chromophore isomerization of photoactive yellow protein: selective observation of tyrosine and tryptophan residues by time-resolved ultraviolet resonance Raman spectroscopy.
    Author: Mizuno M, Hamada N, Tokunaga F, Mizutani Y.
    Journal: J Phys Chem B; 2007 Jun 14; 111(23):6293-6. PubMed ID: 17523627.
    Abstract:
    Picosecond time-resolved ultraviolet resonance Raman (UVRR) spectra of photoactive yellow protein (PYP) were measured. UVRR bands attributed to the vibration of tyrosine and tryptophan residues showed a spectral change upon photoreaction. It was found that the hydrogen-bond strength between the chromophore and Y42 increases in the pG* state. The ultrafast change in the tryptophan band revealed that a photoinduced structural change of the chromophore had propagated to the W119 region, located 12 A from the chromophore, within picoseconds.
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