Abstract
Gas vesicle formation of Halobacterium salinarum requires the expression of 14 gvp genes that are arranged in the vac region. Two different vac regions, p-vac and c-vac, are found in wild-type strain PHH1 that forms gas vesicles by expressing p-vac. The c-vac region is only expressed in the p-vac deletion strain PHH4. Gas vesicle formation is influenced by environmental factors such as oxygen supply and temperature. Anoxic cultures grown in the presence of arginine indicate a reduced gas vesicle formation. Small groups of gas vesicles appear in PHH1, but PHH4 completely lacks gas vesicles. Heat shock inhibits gas vesicle formation in both strains, whereas a temperature of 15°C results in the overproduction of gas vesicles in PHH1 but not PHH4. All these factors influence the amount of transcripts derived from p-vac or c-vac implying that this level is the major point of regulation.
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