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. 1989 Aug;171(8):4334–4341. doi: 10.1128/jb.171.8.4334-4341.1989

Lysis of Escherichia coli by the bacteriophage phi X174 E protein: inhibition of lysis by heat shock proteins.

K D Young 1, R J Anderson 1, R J Hafner 1
PMCID: PMC210209  PMID: 2568986

Abstract

Lysis of Escherichia coli by the cloned E protein of bacteriophage phi X174 was more rapid than expected when bacteria were shifted from 30 to 42 degrees C at the time of E induction. Since such treatment also induces the heat shock response, we investigated the effect of heat shock proteins on lysis. An rpoH mutant was more sensitive to lysis by E, but a secondary suppressor mutation restored lysis resistance to parental levels, which suggests that the sigma 32 subunit itself did not directly increase lysis resistance. At 30 degrees C, mutants in five heat shock genes (dnaK, dnaJ, groEL, groES, and grpE) were more sensitive to lysis than were their wild-type parents. The magnitude of lysis sensitivity varied with mutation and strain background, with dnaK, dnaJ, and groES mutants consistently exhibiting the greatest sensitivities. Extended protection against lysis occurred when overproduction of heat shock proteins was induced artificially in cells that contained a plasmid with the rpoH+ gene under control of the tac promoter. This protective effect was completely abolished by mutations in dnaK, dnaJ, or groES but not by grpE or groEL mutations. Altered membrane behavior probably explains the contradiction whereby an actual temperature shift sensitized cells to lysis, but production of heat shock proteins exhibited protective effects. The results demonstrate that E-induced lysis can be divided into two distinct operations which may now be studied separately. They also emphasize a role for heat shock proteins under non-heat-shock conditions and suggest cautious interpretation of lysis phenomena in systems where E protein production is under control of a temperature-sensitive repressor.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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