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Secretion of the overproduced periplasmic PhoA protein into the medium and accumulation of its precursor in phoA-transformed Escherichia coli strains: involvement of outer membrane vesicles

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Abstract

Various Escherichia coli strains were transformed by multicopy plasmids pHI-1, pHI-7 and pPHOI carrying the entire regulatory and structural phoA sequences. All transformants with the intact pho regulatory system displayed PhoA oversynthesis and secretion into the medium. They also accumulated the alkaline phosphatase precursor localized in the outer membrane fraction. The dynamics of enzyme synthesis and secretion as well as cell cytomorphology during secretion were studied in strain E. coli K12 802 carrying pHI-7 plasmid. PhoA protein was shown to be selectively released into the medium in vesicles budding from outer membrane.

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The authors are with the institute of Biochemistry and Physiology of Microorganisms, USSR Academy of Sciences, 142292 Puschino, Moscow Region, USSR.

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Nesmeyanova, M.A., Tsfasman, I.M., Karamyshev, A.L. et al. Secretion of the overproduced periplasmic PhoA protein into the medium and accumulation of its precursor in phoA-transformed Escherichia coli strains: involvement of outer membrane vesicles. World Journal of Microbiology and Biotechnology 7, 394–406 (1991). https://doi.org/10.1007/BF00329408

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  • DOI: https://doi.org/10.1007/BF00329408

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