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Bacillus subtilis mutants with temperature-sensitive growth on complex media were screened for defects in phospholipid metabolism. One mutant was isolated that showed temperature-sensitive net synthesis of phosphatidylethanolamine. The mutant did not accumulate phosphatidylserine at the nonpermissive temperature. In the presence of hydroxylamine, wild-type B. subtilis accumulated phosphatidylserine at both 32 and 45 degrees C, whereas the mutant did only at 32 degrees C. In vitro phosphatidylethanolamine synthesis with bacterial membranes is no more temperature sensitive with mutant membranes than with wild-type membranes. The mutation probably affects the synthesis indirectly, possibly by altering a membrane protein. The mutant bacteria grew at the nonpermissive temperature, 45 degrees C, in a phosphate buffer-based minimal medium, although net synthesis of phosphatidylethanolamine was also temperature sensitive in this medium. One mutation caused both temperature-sensitive growth on complex media and temperature-sensitive net synthesis of phosphatidylethanolamine. The mutation is linked to aroD by transformation.

Bacillus subtilis mutant with temperature-sensitive net synthesis of phosphatidylethanolamine