DnaK, DnaJ, and GrpE are required for flagellum synthesis in Escherichia coli

J Bacteriol. 1992 Oct;174(19):6256-63. doi: 10.1128/jb.174.19.6256-6263.1992.


The DnaK, DnaJ, and GrpE heat shock proteins are required for motility of Escherichia coli. Cells deleted for dnaK or dnaJ, or with some mutations in the dnaK or grpE gene, are nonmotile, lack flagella, exhibit a 10- to 20-fold decrease in the rate of synthesis of flagellin, and show reduced rates of transcription of both the flhD master operon (encoding FlhD and FlhC) and the fliA operon (encoding sigma F). Genetic studies suggest that DnaK and DnaJ define a regulatory pathway affecting flhD and fliA synthesis that is independent of cyclic AMP-catabolite gene activator protein or the chemotaxis system.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Bacterial Proteins / genetics*
  • Cell Movement / genetics
  • Escherichia coli / genetics*
  • Escherichia coli / metabolism
  • Escherichia coli / ultrastructure
  • Escherichia coli Proteins*
  • Flagella / physiology*
  • Flagella / ultrastructure
  • Flagellin / biosynthesis
  • Genes, Regulator
  • HSP40 Heat-Shock Proteins
  • HSP70 Heat-Shock Proteins*
  • Heat-Shock Proteins / genetics*
  • Mutation
  • Recombinant Fusion Proteins / biosynthesis
  • Transcription, Genetic


  • Bacterial Proteins
  • DnaJ protein, E coli
  • Escherichia coli Proteins
  • GrpE protein, Bacteria
  • GrpE protein, E coli
  • HSP40 Heat-Shock Proteins
  • HSP70 Heat-Shock Proteins
  • Heat-Shock Proteins
  • Recombinant Fusion Proteins
  • Flagellin
  • dnaK protein, E coli