Abstract
The products of phospholipid turnover in Bacillus stearothermophilus were determined in cultures labeled to equilibrium and with short pulses of [32P]phosphate and [2-3H]glycerol. Label lost from the cellular lipid pool was recovered in three fractions: low-molecular-weight extracellular products, extracellular lipid, and lipoteichoic acid (LTA). The low-molecular-weight turnover products were released from the cells during the first 10 to 20 min of a 60-min chase period and appeared to be derived primarily from phosphatidylglycerol turnover. Phosphatidylethanolamine, which appeared to be synthesized in part from the phosphatidyl group of phosphatidylglycerol, was released from the cell but was not degraded. The major product of phospholipid turnover was LTA. Essentially all of the label lost from the lipid pool during the final 40 min of the chase period was recovered as extracellular LTA. The LTA appeared to be derived primarily from the turnover of cardiolipin and the phosphatidyl group of phosphatidylglycerol. Three types of LTA were isolated; an extracellular LTA was recovered from the culture medium, and two types of LTA were extracted from membrane preparations or whole-cell lysates by the hot phenol-water procedure. Cells contained 1.5 to 2.5 mg of cellular LTA per g of cells (dry weight), over 50% of which remained associated with the membrane when cells were fractionated. Over 75% of the 3H label incorporated into the cellular LTA pool during a 90-min labeling period was released from the cells during the first cell doubling after the chase. Label lost from the lipid pool was incorporated into cellular LTA which was then modified and released into the culture medium.
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Selected References
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