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The EcoRI endonuclease is an important recombinant DNA tool and a paradigm of sequence-specific DNA-protein interactions. We have isolated temperature-sensitive (TS) EcoRI endonuclease mutants (R56Q, G78D, P90S, V97I, R105K, M157I, C218Y, A235E, M255I, T261I and L263F) and characterized activity in vivo and in vitro. Although the majority were TS for function in vivo, all of the mutant enzymes were...
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