HALORHODOPSIN and PHOTOSENSORY BEHAVIOR IN Halobacterium halobium MUTANT STRAIN L-33 |
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Authors: | Bernhard,Traulich&dagger Eilo,Hildebrand&Dagger Angelika,Schimz&Dagger Gottfried,WagnerJanos K.,Lanyi§ |
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Affiliation: | Botanisches Institut I der Justus-Liebig-Universität, Senckenbergstr. 17-21 D-6300 Giessen, W. Germany;Institut für Neurobiologie, Kernforschungsanlage Jülich GmbH, Postfach 1913. D-5170 Jülich. W. Germany.;Department of Physiology and Biophysics, University of California, Irvine, CA 92717, USA |
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Abstract: | Halobacterium halobium , strain L-33, which is deficient in bacteriorhodopsin (BR) but synthesizes increased amounts of halorhodopsin (HR), shows behavioral responses upon changes in fluence rate with visible light or with UV light. The observations support the earlier report (Schimz et al. , 1982). that BR is not essential for photosensing in H. halobium. In the UV-range, changes in light intensity elicit the maximal response at λ= 370 nm. In the visible range, changes in light intensity show the maximal response at Δ= 565 nm and a secondary peak at Δ= 590 nm. The latter corresponds to the absorption maximum of HR (Δmax= 588 nm). This light-energy converting retinal pigment of H. halobium thus appears to contribute to photosensory behavior. |
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