λ Repressor and cro—components of an efficient molecular switch

Abstract
In a lysogen, most genes of phage λ are repressed; in response to a transient induction signal, they are efficiently switched on. The switch, which consists in part of a tripartite operator to which two regulatory proteins bind, depends not only on DNA–protein interactions, but also on effects transmitted from one DNA-bound protein to another. λ exemplifies a strategy that facilitates efficient switching between two physiological states in response to a transient signal.

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