Abstract
We found unusual reactivity of a heterochiral dodecadeoxynucleotide toward EcoRI that contains an unnatural l-nucleotide residue at the 3′-flanking site of the hexameric EcoRI recognition sequence. In this study, the kinetic parameters for the reaction were determined by means of a heterochiral molecular beacon that contains the EcoRI recognition sequence in the stem region and possesses the fluorescent and quenching dyes at the 5′- and 3′-termini, respectively. We found that the heterochiral molecular beacon showed large Vmax and small Km values compared to the corresponding homochiral one. This chiral modification is expected to induce a preferable conformational change for binding and catalysis by EcoRI.
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