Putative DNA-dependent ATPase required for providing the needed energy to achieve the termination of early transcripts. Part of the viral DNA-directed RNA polymerase that consists of 8 polII-like subunits (RPB1, RPB2, RPB3, RPB5, RPB6, RPB7, RPB9, RPB10), a capping enzyme and a termination factor. Found in association with viral nucleoid. Expressed in the late phase of the viral replicative cycle. Belongs to the DEAD box helicase family. DEAH subfamily.