The operator-binding domain of λ repressor: structure and DNA recognition

Abstract
The structure of the operator-binding domain of the phage .lambda. repressor protein was determined at 3.2 .ALPHA.NG resolution. This domain contains an extended N-terminal arm and 5 .alpha.-helices. Model-building studies of the repressor-operator complex suggest that .alpha.-helices, especially the N-terminal parts of these helices, may provide a useful surface for protein-DNA interactions. [Phage .lambda. infects Escherichia coli.].