Abstract
The bacteriophage N4 single-stranded DNA binding protein (N4SSB) activates transcription by the Escherichia coli final sigma70-RNA polymerase at N4 late promoters. Here it is shown that the single-stranded DNA binding activity of N4SSB is not required for transcriptional activation. N4SSB interacts with the carboxyl terminus of the RNA polymerase beta' subunit in a region that is highly conserved in the largest subunits of prokaryotic and eukaryotic RNA polymerases.
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