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The rex operon of bacteriophage lambda excludes the development of several unrelated bacteriophages. Here we present an additional lambda rexB function: it prevents degradation of the short-lived protein lambda O known to be involved in lambda DNA replication. We have shown that it is the product of rexB that is responsible for the stabilization of lambda O: when a nonsense mutation is present in rexB, lambda O protein is labile; suppression of the mutation by the corresponding nonsense suppressor causes partial restabilization of lambda O. lambda rexB also stabilizes lambda O in trans. We discuss our results in relation to the function of rexB in lambda DNA replication and its role in the protein degradation pathways of bacteriophage lambda.

An additional function for bacteriophage lambda rex: the rexB product prevents degradation of the lambda O protein.