Acts as an inhibitor of bacterial RNA polymerase by interacting with RpoC subunit and thus preventing promoter recognition by RpoE. Non-DNA-binding transcription factor that plays a role in the transcriptional switch that abolishes transcription of the viral early genes (class I) by the host RNA polymerase but allows transcription of late genes (class II and class III) by T7 RNA polymerase. Interacts with host RpoC; this interaction inhibits host RNA polymerase activity.