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Mutations within the Autographa californica nucleopolyhedrovirus FP25K gene decrease the accumulation of ODV-E66 and
S C Braunagel1, J K Burks, G Rosas-Acosta
1Texas Agricultural Experiment Station, Texas A&M University, College Station, Texas 77843-2475, USA.
Journal of Virology
|September 11, 1999
Summary
Autographa californica nucleopolyhedrovirus FP25K protein is crucial for viral nucleocapsid transport. Mutations in FP25K disrupt the localization and accumulation of viral proteins, impacting viral occlusion.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Autographa californica nucleopolyhedrovirus (AcMNPV) is a significant insect pathogen.
- The FP25K gene (ORF61) is implicated in viral occlusion, but its precise function is unclear.
Purpose of the Study:
- To investigate the role of the FP25K nucleocapsid protein in AcMNPV infection.
- To characterize the effects of FP25K mutations on viral protein expression and localization.
Main Methods:
- Site-directed mutagenesis to create FP25K mutants (480-1 and FP-betagal).
- Analysis of viral protein expression and cellular localization using Western blotting and microscopy.
- Investigation of protein-protein interactions using co-immunoprecipitation.
Main Results:
- FP25K is a nucleocapsid protein present in both budded virus (BV) and occluded virus (ODV).
- Mutations in FP25K significantly reduced ODV-E66 levels and altered its cellular localization.
- FP25K mutations also affected the trafficking of ODV-E25 and the accumulation of other structural proteins like gp67, BV/ODV-E26, and p39.
- Evidence suggests FP25K interacts with ODV-E66, gp67, ODV-E25, and p39, forming protein complexes.
Conclusions:
- FP25K plays a critical role in the intracellular transport and targeting of viral proteins during AcMNPV infection.
- The FP25K protein and its associated complexes are essential for efficient viral replication and occlusion.