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. 1988 Aug;170(8):3668–3674. doi: 10.1128/jb.170.8.3668-3674.1988

Heat shock response of Pseudomonas aeruginosa.

B Allan 1, M Linseman 1, L A MacDonald 1, J S Lam 1, A M Kropinski 1
PMCID: PMC211343  PMID: 3136146

Abstract

The general properties of the heat shock response in Pseudomonas aeruginosa were characterized. The transfer of cells from 30 to 45 degrees C repressed the synthesis of many cellular proteins and led to the enhanced production of 17 proteins. With antibodies raised against the Escherichia coli proteins, two polypeptides of P. aeruginosa with apparent molecular weights of 76,000 and 61,000 (76K and 61K proteins) were shown to be analogous to the DnaK and GroEL heat shock proteins of E. coli due to their immunologic cross-reactivity. The major sigma factor (sigma 87) of P. aeruginosa was shown to be a heat shock protein that was immunologically related to the sigma 70 of E. coli by using polyclonal antisera. A hybridoma was produced, and the monoclonal antibody MP-S-1 was specific for the sigma 87 and did not cross-react with sigma 70 of E. coli. A smaller 40K protein was immunoprecipitated with RNA polymerase antisera from cells that had been heat shocked. The 40K protein was also associated with RNA polymerase which had been purified from heat-shocked cells and may be the heat shock sigma factor of P. aeruginosa. Exposure to ethanol resulted in the production of seven new proteins, three of which appeared to be heat shock proteins.

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Selected References

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