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Type: Journal article
Title: Cro’s role in the CI–Cro bistable switch is critical for λ’s transition from lysogeny to lytic development
Other Titles: Cro's role in the CI-Cro bistable switch is critical for lambda's transition from lysogeny to lytic development
Author: Schubert, R.
Dodd, I.
Egan, J.
Shearwin, K.
Citation: Genes & Development, 2007; 21(19):2461-2472
Publisher: Cold Spring Harbor Laboratory Press
Issue Date: 2007
ISSN: 0890-9369
Statement of
Rachel A. Schubert, Ian B. Dodd, J. Barry Egan and Keith E. Shearwin
Abstract: CI represses cro; Cro represses cI. This double negative feedback loop is the core of the classical CI-Cro epigenetic switch of bacteriophage lambda. Despite the classical status of this switch, the role in lambda development of Cro repression of the P(RM) promoter for CI has remained unclear. To address this, we created binding site mutations that strongly impaired Cro repression of P(RM) with only minimal effects on CI regulation of P(RM). These mutations had little impact on lambda development after infection but strongly inhibited the transition from lysogeny to the lytic pathway. We demonstrate that following inactivation of CI by ultraviolet treatment of lysogens, repression of P(RM) by Cro is needed to prevent synthesis of new CI that would otherwise significantly impede lytic development. Thus a bistable CI-Cro circuit reinforces the commitment to a developmental transition.
Keywords: Bacteriophage lambda; Prophages; DNA-Binding Proteins; Repressor Proteins; Lysogeny; Virus Activation; Gene Expression Regulation, Viral; Base Sequence; Mutation; Molecular Sequence Data; Viral Regulatory and Accessory Proteins; Promoter Regions, Genetic
Rights: Copyright © 2007 by Cold Spring Harbor Laboratory Press.
RMID: 0020072835
DOI: 10.1101/gad.1584907
Appears in Collections:Molecular and Biomedical Science publications

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