Canadian Forest Service Publications
A soluable form of P74 can act as a per os infectivity factor to Autographa californica multiple nucleopolyhedrovirus. 2010. Slack, J.; Lawrence, S.D.; Krell, P.J.; Arif, B.M. Journal of General Virology 91:915-918.
Issued by: Great Lakes Forestry Centre
Catalog ID: 31983
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The baculovirus occlusion-derived virion (ODV) is required to spread virus infection among insect hosts via the per os route. The Autographa californica multicapsid nucleopolyhedrovirus P74 protein is an ODV envelope protein that is essential for ODVs to be infectious. P74 is anchored in the ODV envelope by a C-terminal transmembrane anchor domain and is N-terminally exposed on the ODV surface. In the present study, a series of N-terminal and C-terminal truncation mutants of P74 were evaluated for their ability to rescue per os infectivity of the P74-null virus, AcLP4. It was discovered that a P74 truncation mutant lacking the C-terminal transmembrane anchor domain of P74 was able to rescue per os infection. This result shows that a soluble form of P74 retains per os infectivity factor function and suggests that P74 may be complexed with other proteins in the ODV envelope.