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[Radiosensitive mutants of Escherichia coli with disrupted cell membrane permeability].

Membrane proteins and cell permeability of Escherichia coli B/r and different substrains of B/r containing mutations of loci uvrB, exrA, lon and suppressors of that mutations were studied. Membrane proteins were found to be modified only in E. coli B/r exrA. The content of 40 000--70 000 D polypeptides was increased and the content of 80 000--100 000 D polypeptides was decreased. Alteration of membrane proteins in E. coli B/r exrA was associated with the impaired permeability of cell membrane.