Abstract
Zinc-finger proteins of the Cys 2His 2 type bind DNA–RNA hybrids with affinities comparable to those for DNA duplexes. Such zinc-finger proteins were converted into site-specific cleaving enzymes by fusing them to the FokI cleavage domain. The fusion proteins are active and under optimal conditions cleave DNA duplexes in a sequence-specific manner. These fusions also exhibit site-specific cleavage of the DNA strand within DNA–RNA hybrids albeit at a lower efficiency (≃50-fold) compared to the cleavage of the DNA duplexes. These engineered endonucleases represent the first of their kind in terms of their DNA–RNA cleavage properties, and they may have important biological applications.
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