title: A study of the Autographa californica multiple nucleopolyhedrovirus ODV envelope protein p74 using a GFP tag.
abstract: The Autographa californica multiple nucleopolyhedrovirus (AcMNPV) protein p74 is associated with the occlusion-derived virus (ODV) envelope. p74 is essential for oral infectivity of ODV and has been proposed to play a role in midgut attachment and/or fusion. In this study, p74 protein was expressed in-frame with green fluorescent protein (GFP) to create a p74-GFP chimera. The C-terminal GFP portion of the chimera facilitated visualization of the trafficking of p74 in baculovirus-infected Spodoptera frugiperda (Sf-9) cells. p74-GFP chimeric proteins localized in the intranuclear ring zone of the nucleus and were found to co-precipitate with the microvesicle fraction of cell lysates. A series of truncations of p74 was expressed as p74-GFP chimeras in recombinant baculoviruses. When C-terminal region S580-F645 was deleted from p74, p74-GFP chimera localization became non-specific and chimeras became soluble. p74 region S580-F645 directed GFP to the intranuclear ring zone in a similar pattern to full-length p74. The hydrophobic C terminus of p74 plays a role in protein localization and possibly in transmembrane anchoring and insertion.
authors.affiliation: United State Department of Agriculture, Agriculture Research Service, Plant Sciences Institute, Insect Biocontrol Laboratory, Bldg 011A, Rm 214, BARC-West, Beltsville, MD 20705-2350, USA1.
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Slack
authors.affiliation: United State Department of Agriculture, Agriculture Research Service, Plant Sciences Institute, Insect Biocontrol Laboratory, Bldg 011A, Rm 214, BARC-West, Beltsville, MD 20705-2350, USA1.
authors.forename: Edward M
authors.initials: EM
authors.lastname: Dougherty
authors.affiliation: United State Department of Agriculture, Agriculture Research Service, Plant Sciences Institute, Insect Biocontrol Laboratory, Bldg 011A, Rm 214, BARC-West, Beltsville, MD 20705-2350, USA1.
authors.forename: Susan D
authors.initials: SD
authors.lastname: Lawrence
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins / Q000378:metabolism*; D008969:Molecular Sequence Data; D017924:Nucleopolyhedroviruses / Q000737:chemistry*; D018411:Spodoptera; D014759:Viral Envelope Proteins / Q000032:analysis* / Q000737:chemistry / Q000502:physiology
chemical_list: D008164:Luminescent Proteins; D014759:Viral Envelope Proteins; D049452:Green Fluorescent Proteins