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. 1979 Oct;32(1):162–166. doi: 10.1128/jvi.32.1.162-166.1979

Heat-sensitive lambda repressors retain partial activity during bacteriophage induction.

M Lieb
PMCID: PMC353539  PMID: 161593

Abstract

At 43 degrees C, lambda cIts prophages are "induced" and enter the lytic cycle. Lac- lysogens containing heat-inducible lambda N- prophages were superinfected with a lambda trp/lac N+cI- phage containing a lacZ+ gene whose expression is controlled by the lambda cI product (repressor). Lysogens were then heated, and the synthesis of beta-galactosidase and release of progeny phage were measured. In lambda N- cIts2 or lambda N-cIts16 lysogens superinfected with lambda trp/lac N+, beta-galactosidase appeared earlier and was synthesized more rapidly than in superinfected lysogens containing lambda N- cIts857 prophage. Even at 45 degrees C, the cI857 repressor retained some activity. Lysogens containing other N-cIts mutant prophages producing renaturable repressors were also only partially derepressed at 43 degrees C. Partial derepression of lambda "early" transcription is sufficient for induction of lambda N+ prophages.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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