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THE WHITE MEMBRANE OF CRYSTALLINE BACTERIOOPSIN IN HALOBACTERIUM HALOBIUM STRAIN R1mW AND ITS CONVERSION INTO PURPLE MEMBRANE BY EXOGENOUS RETINAL

Abstract— A new strain isolated from Halobacterium halobium designated R1mW, contained negligible amounts of isoprenoid pigments, had a yellowish white color due to respiratory pigments and showed no proton movement in response to light. However, addition of all‐trans‐retinal converted R1mW into purple cells. Formation of both halorhodopsin and bacteriorhodopsin was indicated by induction of light‐dependent proton uptake and release, respectively. Both haloopsin and bacterioopsin were thus postulated to be present in R1mW. Electron micrographs of freeze‐fractured cytoplasmic membranes revealed patches in a hexagonal array of trimeric particles, comparable to the purple membrane structure.