Wild-type operator binding and altered cooperativity for inducer binding of lac repressor dimer mutant R3

Substitution of the C-terminal leucine heptad repeat region of the normally tetrameric lactose repressor by the leucine heptad repeat dimerization domain of GCN4 protein resulted in cell extracts containing protein, designated R3, which behaved as a dimer based on gel retardation analysis of DNA bin...

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