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- W1526080219 abstract "The pairing of single- and double-stranded DNA molecules at homologous sequences promoted by recA and single-stranded DNA-binding proteins of Escherichia coli follows apparent first-order kinetics. The initial rate and first-order rate constant for the reaction are maximal at approximately 1 recA protein/3 and 1 single-stranded DNA-binding protein/8 nucleotides of single-stranded DNA. The initial rate increases with the concentration of duplex DNA; however, the rate constant is independent of duplex DNA concentration. Both the rate constant and extent of reaction increase linearly with increasing length of duplex DNA over the range 366 to 8623 base pairs. In contrast, the rate constant is independent of the size of the circular single-stranded DNA between 6,400 and 10,100 nucleotides. No significant effect on reaction rate is observed when a single-stranded DNA is paired with 477 base pairs of homologous duplex DNA joined to increasing lengths of heterologous DNA (627-2,367 base pairs). Similarly, heterologous T7 DNA has no effect on the rate of pairing. These findings support a mechanism in which a recA protein-single-stranded DNA complex interacts with the duplex DNA to produce an intermediate in which the two DNA molecules are aligned at homologous sequences. Conversion of the intermediate to a paranemic joint then occurs in a rate-determining unimolecular process." @default.
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- W1526080219 date "1986-01-01" @default.
- W1526080219 modified "2023-10-02" @default.
- W1526080219 title "On the mechanism of pairing of single- and double-stranded DNA molecules by the recA and single-stranded DNA-binding proteins of Escherichia coli." @default.
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- W1526080219 doi "https://doi.org/10.1016/s0021-9258(17)36047-7" @default.
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