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HALORHODOPSIN and PHOTOSENSORY BEHAVIOR IN Halobacterium halobium MUTANT STRAIN L‐33
Author(s) -
Traulich Bernhard,
Hildebrand Eilo,
Schimz Angelika,
Wagner Gottfried,
Lanyi Janos K.
Publication year - 1983
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1983.tb04521.x
Subject(s) - halorhodopsin , bacteriorhodopsin , strain (injury) , halobacterium , biophysics , light intensity , halobacteriaceae , mutant , haloarchaea , biology , pigment , absorption (acoustics) , chemistry , optics , halobacterium salinarum , anatomy , biochemistry , physics , genetics , bacteria , membrane , organic chemistry , gene , halophile
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 (Δ max = 588 nm). This light‐energy converting retinal pigment of H. halobium thus appears to contribute to photosensory behavior.