Color Discriminating Pigments in Halobacterium halobium
As in the world of higher organisms, light is a key carrier of information in the microbial world, guiding the motion of single-celled prokaryotic and eukaryotic organisms. The archaebacterial species Halobacterium halobium uses chromoproteins chemically similar to our visual pigments (rhodopsins) to sense light and to distinguish its color (Spudich and Bogomolni, 1988). The purpose of this chapter is to review briefly progress on the molecular properties of the bacterial sensory rhodopsins since the first of these pigments (sensory rhodopsin I (SR-I)) came to light in 1982, and to present some recent work from our laboratory.
KeywordsVisual Pigment Sensory Rhodopsin Retinal Chromophore Halobacterium Halobium High Intensity Region
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