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Science 7 January 1994:
Vol. 263. no. 5143, pp. 75 - 77
DOI: 10.1126/science.8272867
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Articles

Science, Vol 263, Issue 5143, 75-77
Copyright © 1994 by American Association for the Advancement of Science

articles

Target of the transcriptional activation function of phage lambda cI protein

M Li, H Moyle, and MM Susskind

Department of Biological Sciences, University of Southern California, Los Angeles 90089-1340.

Activation of transcription initiation by the cI protein of phage lambda is thought to be mediated by a direct interaction between cl and RNA polymerase at the PRM promoter. Two negatively charged amino acid residues in the DNA binding domain of cI play a key role in activation, suggesting that these residues contact RNA polymerase. The subunit of RNA polymerase involved was identified by selecting polymerase mutants that restored the activation function of a mutant form of cI protein. Although previous studies suggest that several activators interact with the alpha subunit of RNA polymerase, the results here suggest that cI interacts with the sigma subunit. An arginine to histidine change near the carboxyl terminus of sigma specifically suppresses an aspartic acid to asparagine change in the activation region of cI. This finding supports the direct-contact model and suggests that a cluster of positively charged residues near the carboxyl terminus of sigma is the target of the negatively charged activation region of cI.


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   Abstract »    PDF »


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