PMID: 1252088Feb 1, 1976Paper

Altered phospholipid metabolism in a temperature-sensitive mutant of a thermophilic bacillus

Archives of Microbiology
L L Kostiw, K A Souza


The phospholipid metabolism of a temperature-sensitive mutant of a thermophilic bacillus was studied after the shift from a permissive (58 degrees C) to a restrictive (65 degrees C) growth temperature. During the short period of growth of the mutant at 65 degrees C, the proportions of cardiolipin and its 3-acyl derivative (lyso-cardiolipin) increased, and the proportions of phosphatidylglycerol and phosphatidylethanolamine decreased on cell dry weight basis. In 32P incorporation and turnover experiments, phosphatidylglycerol showed the most rapid uptake and loss of the label. Turnover of cardiolipin, limited to a short period, ceased 18 min after the shift, as did the turnover of phosphatidylethanolamine. In the absence of net phospholipid synthesis, there was a quantitative conversion of phosphatidylglycerol to cardiolipin and an increase in the proportion of lyso-cardiolipin. Chloramphenicol, added to the medium at the time of the shift, reduced the rate of phospholipid synthesis, prevented the increase in the proportions of cardiolipin and lyso-cardiolipin, and slowed the decrease in the proportions of the other two phospholipids. The results indicated a defect in the regulatory mechanism(s) of phospholipid metabolism in the...Continue Reading


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