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- W1664340045 abstract "The reactions of the EcoRI restriction endonuclease on the covalently closed DNA of plasmid pMB9 were studied in the presence of ethidium bromide. At the concentrations of ethidium bromide tested, which covered the range over which the DNA is changed from negatively to positively supercoiled, the dye caused no alteration to the rate at which this enzyme cleaved the covalently closed DNA to yield the open-circle form, but the rate at which these open circles were cleaved to the linear product could be inhibited. The fluorescence change, caused by ethidium bromide binding with different stoichiometries to covalently closed and open-circle DNA, provided a direct and sensitive signal for monitoring the cleavage of DNA by this enzyme. This method was used for a steady-state kinetic analysis of the reaction catalysed by the EcoRI restriction enzyme. Reaction mechanisms where a complex between DNA and Mg2+ is the substrate for this enzyme were eliminated, and instead DNA and Mg2+ must bind to the enzyme in separate stages. The requisite controls for this fluorimetric assay in both steady-state and transient kinetics studies, and its application to other enzymes that alter the structure of covalently closed DNA, are described." @default.
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- W1664340045 date "1981-12-01" @default.
- W1664340045 modified "2023-09-23" @default.
- W1664340045 title "The <i>Eco</i>RI restriction endonuclease, covalently closed DNA and ethidium bromide" @default.
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- W1664340045 doi "https://doi.org/10.1042/bj1990767" @default.
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