TraJ protein of plasmid RP4 binds to a 19-base pair invert sequence repetition within the transfer origin - PubMed (original) (raw)
. 1989 Jul 15;264(20):11989-94.
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- PMID: 2663846
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TraJ protein of plasmid RP4 binds to a 19-base pair invert sequence repetition within the transfer origin
G Ziegelin et al. J Biol Chem. 1989.
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Abstract
Transfer of plasmid RP4 during bacterial conjugation requires the plasmid-encoded TraJ protein, which binds to the transfer origin (Fürste, J. P., Pansegrau, W., Ziegelin, G., Kröger, M., and Lanka, E. (1989) Proc. Natl. Acad. Sci. U.S.A. 86, 1771-1775). As indicated by traJ mutants, the TraJ protein is a constituent of the relaxosome, the initiation complex of transfer DNA replication. The traJ gene maps adjacent to the transfer origin (oriT). The structural gene consists of a 372-base pair sequence encoding a polypeptide of 122 amino acids (13,282 Da). TraJ was purified from an Escherichia coli strain overproducing the protein. DNA footprinting experiments involving DNase I demonstrated that the purified protein binds to the right arm of a 19-base pair inverted repeat within oriT. Hydroxyl radical footprints of the DNA-protein complex revealed that TraJ protein is bound to only one side of the DNA helix.
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