Summary
We have previously shown that a mutation (groPC259) in the E. coli dnaJ gene renders the cell inviable at high temperatures and arrests bacteriophage λ DNA replication at all temperatures (Sunshine et al., 1977). We have isolated λdnaJ ++ transducing phages both by in vitro cloning and by abnormal excision of a λdnaK transducing phage integrated near the dnaJ locus. The dnaJ gene product has been identified on SDS polacrylamide gels after infection of UV-irradiated E. coli cells by λdnaJ ++ derivative phages. It is a polypeptide chain with an apparent molecular weight of 37,000-daltons. This has been verified by the fact that a transducing phage carrying an amber mutation in the dnaJ gene fails to induce the synthesis of the 37,000-dalton polypeptide chain upon infection of sup ++ bacteria, but does so upon infection of supF or supD bacteria.
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Georgopoulos, C.P., Lundquist-Heil, A., Yochem, J. et al. Identification of the E. coli dnaJ gene product. Molec. gen. Genet. 178, 583–588 (1980). https://doi.org/10.1007/BF00337864
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DOI: https://doi.org/10.1007/BF00337864