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J. Bacteriol., 01 1995, 46-51, Vol 177, No. 1
Copyright © 1995, American Society for Microbiology

Specific binding of the NikA protein to one arm of 17-base-pair inverted repeat sequences within the oriT region of plasmid R64

N Furuya and T Komano
Department of Biology, Tokyo Metropolitan University, Japan.

Products of the nikA and nikB genes of plasmid R64 have been shown to form a relaxation complex with R64 oriT DNA and to function together as an oriT-specific nickase. We purified the protein product of the nikA gene. The purified NikA protein bound specifically to the oriT region of R64 DNA. Gel retardation assays and DNase I footprinting analyses indicated that the NikA protein bound only to the right arm of 17-bp inverted repeat sequences; the right arm differed from the left arm by a single nucleotide. The binding site is proximal to the nick site and within the 44-bp oriT core sequence. Binding of the NikA protein induced DNA bending within the R64 oriT sequence.

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