The nature of ompA mutants of Escherichia coli K12 exhibiting temperature-sensitive bacteriophage resistance |
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Authors: | Renato Morona Cornelia Krämer and Ulf Henning |
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Institution: | (1) Max-Planck-Institut für Biologie, D-7400 Tübingen, Germany;(2) Present address: Department of Microbiology and Immunology, The University of Adelaide, Adelaide, Australia |
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Abstract: | Summary A class of ompA mutants of Escherichia coli, exhibiting temperature-sensitive resistance towards phages using the OmpA protein as receptor, was analysed. The mutants produce detectable levels of the protein at 42°C but not at 30°C (Manning and Reeves 1976). They were found to have a deletion (one isolate) or insertions (three isolates) upstream of the coding part of the ompA gene. Several previously characterized mutants possessing insertions or a deletion in the non-translated 5 area of the gene also exhibited a similar temperature-sensitive phage resistance. This cold-sensitive phenotype is explained in terms of the recent discovery that the stability of ompA mRNA is regulated by the rate of cell growth (Nilsson et al. 1984). |
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