Regions of the genome of the multinucleocapsid nuclear polyhedrosis virus (OpMNPV) containing the DNA polymerase and helicase genes were sequenced. The DNA polymerase and helicase genes encode predicted proteins of 985 (112·6 kDa) and 1223 (140·5 kDa) amino acids and exhibited 63% and 59% amino acid identity, respectively, with their homologues in the MNPV (AcMNPV). The influence of sequence variation between the OpMNPV and AcMNPV DNA polymerase and helicase was investigated by employing gene substitution experiments in transient replication assays in and cells. The DNA polymerase gene appeared to be interchangeable in this assay; both the AcMNPV and OpMNPV DNA polymerase supported high levels of replication of an origin-containing reporter plasmid when substituted for their homologue and cotransfected with a set of heterologous essential and stimulatory replication genes into uninfected insect cells. However, the OpMNPV helicase failed to support replication when it replaced the AcMNPV helicase from the set of AcMNPV replication genes cotransfected into cells. In contrast, the AcMNPV helicase gene supported about 50% of the level of replication when substituted for its homologue in the OpMNPV set of replication genes.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error