Synergistic activation of transcription by bacteriophage lambda cI protein and E. coli cAMP receptor protein

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Science  23 Sep 1994:
Vol. 265, Issue 5180, pp. 1863-1866
DOI: 10.1126/science.8091212


Two heterologous prokaryotic activators, the bacteriophage lambda cI protein (lambda cI) and the Escherichia coli cyclic AMP receptor protein (CRP), were shown to activate transcription synergistically from an artificial promoter bearing binding sites for both proteins. The synergy depends on a functional activation (positive control) surface on each activator. These results imply that both proteins interact directly with RNA polymerase and thus suggest a precise mechanism for transcriptional synergy: the interaction of two activators with two distinct surfaces of RNA polymerase.