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      Oleanolic and ursolic acids influence affect the expression of the cysteine regulon and the stress response in Escherichia coli.

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          Abstract

          The pentacyclic triterpenoids, oleanolic, and ursolic acids, affect peptidoglycan metabolism, altering bacterial morphology, and inhibit the growth and survival of several bacterial species, including pathogenic ones. We investigated the effect of subinhibitory concentrations of these compounds on the expression of three operons from the E. coli cysteine regulon, cysPTWA, cysJIH, and cysB, by using transcriptional fusions with the lacZ reporter gene. An inhibitory effect on β-galactosidase expression directed by all three chromosomal fusions was observed with both compounds. In addition, oleanolic acid, but not ursolic acid, caused a weak increase in DnaK synthesis, suggesting moderate ability of inducing heat-shock response.

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          Author and article information

          Affiliations
          [1 ] Department of Bacterial Genetics, Institute of Microbiology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland. grudam@biol.uw.edu.pl
          Journal
          Curr. Microbiol.
          Current microbiology
          1432-0991
          0343-8651
          Apr 2011
          : 62
          : 4
          21221969 10.1007/s00284-010-9866-0

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