We designed a pENTR4 vector (Thermo Fisher Scientific, Waltham, MA, USA) for cloning into replication-deficient recombinant adenovirus serotype 5 (Thermo Fisher Scientific, USA), which consists of a HBV 1.3-overlength genome [28 (link)] linked to a click beetle green (CBG99) luciferase separated by a P2A linker site derived from the porcine teschovirus. The P2A linker and the CBG99-luciferase were cloned in frame onto the second open reading frame coding for the HBc protein and after the HBV polyA-sequence. Generation and titration of serotype 5 adenoviruses was performed as described before [29 (link)].
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