SUMMARY: was cultured in a complex medium designed for extreme halophiles containing 4 M-NaCl in the absence or presence of bacitracin (7, 14 or 28 μM) with shaking at 37°C for 24 h. Bacitracin at 7 or 14 μM inhibited growth (50% and 100%, respectively), phospholipid synthesis (88% and 96%, respectively) and bacterioruberin synthesis (65% and 87%, respectively) relative to a control lacking bacitracin. After 5 h incubation in the presence of 7 or 28 μM-bacitracin, total lipid biosynthesis, as measured by incorporation of C from short-term labelling with [C]glycerol, was inhibited by 26% and 66%, respectively. Bacitracin at 7 or 28 μM inhibited biosynthesis of the major phospholipids (9% and 60%), glycolipids (25% and 85%) and polyisoprenyl pyrophosphate (75% at both concentrations). These results support the concept that polyisoprenyl pyrophosphate is involved directly in the biosynthesis of phospholipids, glycolipids and bacterioruberins in the extreme halophile


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