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Multiple Effects of Fis on Integration and the Control of Lysogeny in Phage Lambda

Overview
Journal J Bacteriol
Specialty Microbiology
Date 1991 Jul 1
PMID 1829454
Citations 43
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Abstract

Fis is a small, basic, site-specific DNA-binding protein present in Escherichia coli. A Fis-binding site (F) has been previously identified in the attP recombination site of phage lambda (J. F. Thompson, L. Moitoso de Vargas, C. Koch, R. Kahmann, and A. Landy, Cell 50:901-908, 1987). The present study demonstrates that in the absence of the phage-encoded Xis protein, the binding of Fis to F can stimulate integrative recombination and therefore increase the frequency of lambda lysogeny in vivo. Additionally, Fis exerts a stimulatory effect on both integration and lysogeny that is independent of binding to the attP F site. Maintenance of the lysogenic state also appears to be enhanced in the presence of Fis, as shown by the increased sensitivity of lambda prophages encoding temperature-sensitive repressors to partial thermoinduction in a fis mutant. In the presence of Xis, however, Fis binding to F interferes with integration by stimulating excision, the competing back-reaction. Since Fis stimulates both excision and integration, depending on the presence or absence of Xis, respectively, we conclude that Xis binding to X1 is the key determinant directing the formation of an excisive complex.

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