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Biophysical Journal 17: 179-183 (1977)
© 1977 the Biophysical Society

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The quantum efficiency of the bacteriorhodopsin photocycle.

C R Goldschmidt, O Kalisky, T Rosenfeld and M Ottolenghi

ABSTRACT

The quantum yield of the primary photoprocess in light-adapted bacteriorhodopsin (phi 1) was determined at room temperature with low-intensity 530 nm neodymium laser excitation, with bovine rhodopsin as a relative actinometer. The observed value of phi 1 - 0.25 +/- 0.05, and the previously determined parameter phi 1/phi 2 - 0.4 [where phi 2 denotes the quantum efficiency of the back photoprecess from the primary species K (590)] imply that phi 1 + phi 2 approximately equal 1. This feature, also characterizing the photochemistry of rhodopsin, bears on the nature and mechanism of the primary event in both systems.




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E. Ippen, C. Shank, A Lewis, and M. Marcus
Subpicosecond spectroscopy of bacteriorhodopsin
Science, June 16, 1978; 200(4347): 1279 - 1281.
[Abstract] [PDF]


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Copyright © 1977 by the Biophysical Society.