The Bleaching of the Bacteriorhodopsin Chromophore by Ionizing Radiation

W.V. Sherman Department of Physical Sciences, Chicago State University, Chicago, Illinois, U.S.A.

M.A. Slifkin Department of Pure and Applied Physics, The University, Salford, M5 4WT, England

A.P. Kushelevsky Department of Nuclear Engineering, Ben-Gurion University of the Negev, Beersheva, Israel

S.A.H. Parker Department of Physical Sciences, Chicago State University, Chicago, Illinois, U.S.A.

Summary

The visible chromophore of bacteriorhodopsin, BR(570), undergoes progressive bleaching when subjected to ⁶⁰Co γ-irradiation. The low G-value for bleaching confirms that the site of the chromophore is highly protected. Positive and negative circular dichroic (CD) bands associated with the chromophone undergo concomitant decrease in a manner which is consistent with two independent chromophores rather than exciton coupling between neighbouring chromophoric sites.

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The Bleaching of the Bacteriorhodopsin Chromophore by Ionizing Radiation

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