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  • Title: Biosynthesis and secretion of several enzymes in Escherichia coli dnaK and dnaJ mutants.
    Author: Wolska KI, Lobacz B, Jurkiewicz D, Bugajska E, Kuć M, Jóźwik A.
    Journal: Microbios; 2000; 101(400):157-68. PubMed ID: 10756520.
    Abstract:
    Escherichia coli null dnaJ and dnaKdnaJ mutants were defective in the biosynthesis and secretion of several enzymes. The synthesis of beta-galactosidase induced in delta dnaJ and delta dnaKdnaJ mutants was abolished at 42 degrees C and significantly decreased at 30 and 37 degrees C. The activity of alkaline phosphatase in the periplasm in both mutant strains at high temperature was lower than in the wild-type strain. The synthesis of b-type cytochromes was defective in two deletion mutants while the synthesis of nitrate reductase-A at 42 degrees C was influenced by dnaK mutation only. The lack of DnaK and DnaJ does not impair the activity of catechol 2,3-dioxygenase irrespective of growth temperature.
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