Intermolecular vibrational coherence in bacteriochlorophyll a with clustered polar solvent molecules

Article Abstract:

Resonant impulsive excitation of the [Q.sub.y] absorption band of bacteriochlorophyll a (BChl) launches a rapidly damped ground-state coherent wave-packet motion that arises from intermolecular modes with clustered solvent molecules. The results support the hypothesis that the low-frequency vibrational modes in the 100-[cm.sup.-1] regime that are coupled to the light-driven charge-separation reactions are derived from intermolecular vibrational modes between the chromophores and the surrounding protein medium.

Observations, Bacteria, Photosynthetic, Photosynthetic bacteria, Intermolecular forces, Bacteriology

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Excited-state vibrational coherence and anisotropy decay in the bacteriochlorophyll a dimer protein B820

Article Abstract:

A study was conducted to analyze coherent wave packet dynamics and anisotropy decays after the impulsive excitation of the B820 subunit of the LH1 light-harvesting complex. A femtosecond dynamic absorption method was carried out at room temperature to observe the vibrational wave packet motions. Experimental results indicated several possible assignments for a product state in B820 that forms after the preparation of a lower exciton state.

Usage, Proteins, Anisotropy, Spectrum analysis, Spectroscopy, Wave packets

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Intramolecular vibrational preparation of the unfolding transition state of Z[n.sup.II]-substituted cytochrome c

Article Abstract:

The effect of the polarity and viscosity of the solvent medium on the unfolding and refolding reactions of Z[n.sup.II]-substituted cytochrome c at room temperature is examined. The results suggest an important role for the solvent in the kinetic control of protein-folding trajectories on the energy landscape.

Protein folding, Cytochrome c, Zinc compounds, Structure, Chemical properties, Report

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