Vibrational assignment of torsional normal modes of rhodopsin: probing excited-state isomerization dynamics along the reactive C11 forming C12 torsion coordinate

Article Abstract:

A study was conducted to analyze the vibrational assignment of torsional normal modes of rhodopsin. Isotopically labeled retinal derivatives and normal mode analysis were utilized to examine the vibrational properties of the Raman-active modes of rhodopsin at the lower-frequency region. Resonance Raman scattering was excited by focusing 488.0 or 514.5-nm light from an argon laser. In addition, the C11 forming C12 torsional mode of rhodopsin was assigned at 568 cm (super -1).

Cells (Biology), Cells, Vibrational spectra

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Resonance Raman structural evidence that the Cis-to-trans isomerization in rhodopsin occurs in femtoseconds

Article Abstract:

The results provided the first structural snapshots of the initial room-temperature intermediates in the photochemistry of vision. The striking correspondence between the room temperature, ps time-resolved vibrational structure of photorhodopsin/bathorhodopsin and that of the low-temperature trapped primary photoproduct suggests that impulsively driven protein residue motion is a critical component of the reaction coordinate.

Isomerization, Photochemistry, Atomic properties

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Femtosecond stimulated Raman study of excited-state evolution in bacteriorhodopsin

Article Abstract:

The femtosecond time-resolved stimulated Raman spectroscopy (FSRS) is used for the photoisomerization dynamics in the excited state of bacteriorhodopsin is examined. Near-IR stimulated emission is observed in the FSRS probe window that decays with a 400-600-fs time constant.

Usage, Raman spectroscopy, Excited state chemistry, Isomerism, Isomers (Chemistry)

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