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. 1994 Aug 11;22(15):3155–3159. doi: 10.1093/nar/22.15.3155

Real time kinetics of restriction endonuclease cleavage monitored by fluorescence resonance energy transfer.

S S Ghosh 1, P S Eis 1, K Blumeyer 1, K Fearon 1, D P Millar 1
PMCID: PMC310290  PMID: 8065930

Abstract

The kinetics of PaeR7 endonuclease-catalysed cleavage reactions of fluorophor-labeled oligonucleotide substrates have been examined using fluorescence resonance energy transfer (FRET). A series of duplex substrates were synthesized with an internal CTCGAG PaeR7 recognition site and donor (fluorescein) and acceptor (rhodamine) dyes conjugated to the opposing 5' termini. The time-dependent increase in donor fluorescence resulting from restriction cleavage of these substrates was continuously monitored and the initial rate data was fitted to the Michaelis-Menten equation. The steady state kinetic parameters for these substrates were in agreement with the rate constants obtained from a gel electrophoresis-based fixed time point assay using radiolabeled substrates. The FRET method provides a rapid continuous assay as well as high sensitivity and reproducibility. These features should make the technique useful for the study of DNA-cleaving enzymes.

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Selected References

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