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A previously identified human herpesvirus 6B (HHV-6B) origin of DNA replication contains two binding sites for the origin-binding protein (OBPH6B). We have investigated the functional significance of these sites by determining the replication efficiencies of mutated origin sequences, using a transient replication assay. The results indicate that both sites are required for DNA replication. In addition, we have tested the functional consequences of linear sequence amplifications in the origin. The data show that tandemized origin elements are more efficiently replicated than single-copy origins. Finally, we have determined the extent of interstrain origin sequence variation that exists among HHV-6 isolates by cloning, sequencing, and analyzing origins from a number of virus isolates, including examples of both HHV-6A and HHV-6B.

journal of virology

Human herpesvirus 6B origin: sequence diversity, requirement for two binding sites for origin-binding protein, and enhanced replication from origin multimers