in a coupled transcription-translation system , the p4 late gene promoter was activated by either the delta protein of p4 or the ogr protein of helper phage p2 in the absence of any other phage-encoded factor . delta-dependent transcription was inhibited by antibodies to the sigma 70 subunit of e. coli rna polymerase but was restored by purified sigma 70 , indicating that activation of transcription by the delta protein of p4 is dependent on the sigma 70 holoenzyme .
C0040649
transcription
C0162493
activation