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. 1984 Oct;81(20):6432–6436. doi: 10.1073/pnas.81.20.6432

Kinetic analysis of mutations affecting the cII activation site at the PRE promoter of bacteriophage lambda.

M C Shih, G N Gussin
PMCID: PMC391938  PMID: 6238332

Abstract

Abortive initiation and run-off transcription assays were used to study the effects of cy mutations on activation of the phage lambda PRE promoter by cII gene product. Six point mutations in the repeated T-T-G-C sequences that flank the -35 consensus region of PRE decreased the apparent affinity of the promoter for cII protein by factors of 4-16 relative to the wild-type affinity. Kinetic analyses of transcription initiation in the presence and absence of cII protein demonstrated that five of the six mutations did not significantly affect the intrinsic interaction of RNA polymerase with PRE. Thus, these mutations differ from other cy mutations, including those in the -35 consensus region, which affect the formation of polymerase-PRE closed complexes or the isomerization of closed complexes to open complexes but do not affect the binding of cII protein. A sixth T-T-G-C mutation, cy3001, may affect intrinsic initiation by RNA polymerase as well as cII binding.

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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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