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. 1983 Apr;154(1):130–138. doi: 10.1128/jb.154.1.130-138.1983

Integration of the overproduced bacteriophage T5 receptor protein in the outer membrane of Escherichia coli.

B Menichi, A Buu
PMCID: PMC217439  PMID: 6339467

Abstract

The tonA gene codes for an outer membrane protein, a receptor of phage T5, the TonA protein. Strains harboring pLG513, a multicopy plasmid in which the tonA gene has been cloned, overproduced TonA protein, which appeared in sodium dodecyl sulfate-polyacrylamide gel electrophoresis of cell envelope proteins as a 78,000-molecular-weight protein. Identical results have been observed by Plastow et al. (FEBS Lett. 131:262-264, 1981) with plasmid pLC19-19, in which the tonA gene has also been cloned. The activity of the TonA protein, measured by its capacity to inactivate phage T5, increased by five- to sixfold in purified envelopes of cells harboring pLG513 compared with cells lacking the plasmid. Solubilization of the cytoplasmic membrane by Triton-Mg2+ treatment did not increase this activity. However, partial solubilization of outer membrane proteins by Triton-EDTA unmasked further T5 receptor activity, resulting in a final increase of around 50-fold, a value more consistent with the expected gene dosage effect. Treatment of whole cells by trypsin in conditions in which trypsin is allowed to enter the outer membrane revealed that part of the overproduced T5 receptors were embedded in the outer membrane and masked by a trypsin-sensitive protein. In addition, no T5 receptor activity was detected in either the periplasmic space or the cytoplasm. These results suggest that all of the overproduced TonA molecules were synthesized in an active form and integrated in the outer membrane, but only a small fraction could be reached or recognized by phage T5 in vivo.

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Selected References

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