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Direct Observation of the Femtosecond Excited-State cis - trans Isomerization in Bacteriorhodopsin
Abstract
Femtosecond optical measurement techniques have been used to study the primary photoprocesses in the light-driven transmembrane proton pump bacteriorhodopsin. Light-adapted bacteriorhodopsin was excited with a 60-femtosecond pump pulse at 618 nanometers, and the transient absorption spectra from 560 to 710 nanometers were recorded from -50 to 1000 femtoseconds by means of 6-femtosecond probe pulses. By 60 femtoseconds, a broad transient hole appeared in the absorption spectrum whose amplitude remained constant for about 200 femtoseconds. Stimulated emission in the 660- to 710-nanometer region and excited-state absorption in the 560- to 580-nanometer region appeared promptly and then shifted and decayed from 0 to ∼150 femtoseconds. These spectral features provide a direct observation of the 13- trans to 13- cis torsional isomerization of the retinal chromophore on the excited-state potential surface. Absorption due to the primary ground-state photoproduct J appears with a time constant of ∼500 femtoseconds.
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Cited by
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Metadata
- Authors
- Mathies, R. A., Brito Cruz, C. H., Pollard, W. T., & Shank, C. V.
- Venue
- Science
- Published
- 1988-05-06
- Volume
- 240
- Issue
- 4853
- Pages
- 777-779
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1968921161
- Cited by
- 558
- References
- 0
- FWCI
- 9.71
- Type
- journal article
- Language
- en
- Open access
- closed
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- Mathies, R. A., Brito Cruz, C. H., Pollard, W. T., & Shank, C. V. (1988). Direct Observation of the Femtosecond Excited-State cis - trans Isomerization in Bacteriorhodopsin. Science. https://doi.org/10.1126/science.3363359
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