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[Effect of mutation in phoB and phoM genes for the positive control of alkaline phosphatase biosynthesis on Escherichia coli envelope proteins].

The suppression of some envelope proteins, localized in both the periplasm and the outer and inner membranes was shown in phoB and phoM phoR mutants of E. coli. Among these proteins are the proteins of the phosphate regulon and also those not pertaining them. As a result of phoB and phoM phoR mutations, the cytoplasmic membrane was found to be lacking in minor protein of 28,000 Mr, which belongs to the phosphate regulon. Besides, the phoM phoR mutation leads to the loss of protein of 55,000 Mr of the outer membranes, whereas phoB mutation causes loss of protein 37 000 Mr, identified as outer membrane protein OmpT. A damage in the phoB mutant of the protein proteolytic modification, probably determining the suppression of the biosynthesis of E. coli envelope secreted proteins is suggested.