Twelve new MotA-dependent middle promoters of bacteriophage T4: consensus sequence revised.

Bacteriophage T4 middle-mode transcription requires Escherichia coli RNA polymerase, phage-encoded transcriptional activator MotA and co-activator AsiA that form a complex at a middle promoter DNA. T4 middle promoters have been defined by a consensus sequence deduced from the list of 14 middle promoters identified in earlier studies. To date, 33 middle promoters have been mapped on the T4 genome.