Isolation of dnaJ, dnaK, and grpE homologues from Borrelia burgdorferi and complementation of Escherichia coli mutants.
The heat-shock proteins DnaJ, DnaK, and GrpE are involved in the replication of various species of DNA in Escherichia coli, in addition to their roles in other processes, including protein disaggregation and export. We have cloned the Borrelia burgdorferi homologues of these genes. DNA sequence analysis revealed an open reading frame encoding a protein that is 62% identical to the E. coli DnaK protein. Genes homologous to the E. coli grpE and dnaJ genes, encoding products 28% and 39% identical to their homologues, are located up- and downstream, respectively, of the B. burgdorferi dnaK gene. No obvious promoters were detected in the sequenced DNA, although a potential transcription terminator was found downstream of the dnaJ gene, so these three genes may form an operon, perhaps with a fourth gene located upstream of the grpE gene. The grpE homologue complemented an E. coli grpE mutant and the dnaJ homologue complemented an E. coli dnaJ mutant, whereas the B. burgdorferi dnaK gene did not complement dnaK mutants.
Tilly
K
K
Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana 59840.
Hauser
R
R
Campbell
J
J
Ostheimer
G J
GJ
D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D015748:Borrelia burgdorferi Group / Q000235:genetics*; D002874:Chromosome Mapping; D002876:Chromosomes, Bacterial; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial / Q000235:genetics; D005816:Genetic Complementation Test; D050956:HSP40 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D009876:Operon / Q000235:genetics; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
D001426:Bacterial Proteins; D004269:DNA, Bacterial; C494635:DnaJ protein, E coli; D029968:Escherichia coli Proteins; C068113:GrpE protein, Bacteria; C489400:GrpE protein, E coli; D050956:HSP40 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins; C063842:dnaK protein, E coli