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We have mutated the monomer-monomer interface of the restriction endonuclease EcoRI in order to destabilize the homodimer and to stabilize heterodimers. Mutations of Leu158 to charged amino acid residues result in strong destabilization of the dimer. The largest effect was detected for the L158D mutant which is monomeric even at higher concentrations. It unspecifically degrades DNA by cleaving both single strands independently every 15 nucleotides on the average. Although cleavage is reproducible, it is not determined by nucleotide sequence but by general properties like conformation or deformability as has been found for other unspecific nucleases.

A monomeric mutant of restriction endonuclease EcoRI nicks DNA without sequence specificity