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• W2023224591 endingPage "8595" @default.
• W2023224591 startingPage "8584" @default.
• W2023224591 abstract "ABSTRACT The GP64 envelope glycoprotein of the Autographa californica nucleopolyhedrovirus (AcMNPV) is a class III viral membrane fusion protein that is triggered by low pH during entry. Unlike most other viral fusion protein trimers, the monomers of GP64 are covalently linked to each other within the trimer by a single intermolecular disulfide bond (Cys24—Cys372). Single or paired alanine substitutions for Cys24 and Cys372 resulted in lower-efficiency transport of GP64 to the cell surface. Surprisingly, these mutated GP64s induced syncytium formation, and normalized fusion activities were approximately 30% of that from wild-type (WT) GP64. Heat treatment (37°C) did not further reduce fusion activity of GP64 constructs with a disrupted intermolecular disulfide bond, suggesting that the GP64 trimers were relatively thermostable in the absence of the intermolecular disulfide bond. In addition, analysis of binding by a conformation-specific monoclonal antibody (MAb) suggested that the low-pH-induced refolding of those GP64 constructs was generally similar to that of WT GP64. In addition to its critical role in membrane fusion, GP64 is also necessary for efficient budding. When GP64 constructs containing a disrupted intermolecular disulfide bond (Cys24—Cys372) were displayed at the cell surface at levels comparable to those of WT GP64, virion budding efficiency ranged from approximately 39 to 88%, indicating that the intermolecular disulfide bond is not required for virion budding. However, GP64 proteins with a disrupted intermolecular disulfide could not rescue a GP64-null bacmid. We also examined the 6 conserved intramolecular disulfide bonds using single and paired alanine substitution mutations. None of the GP64 constructs with disrupted intramolecular disulfide bonds were capable of mediating pH-triggered membrane fusion, indicating that the intramolecular disulfide bonds are all necessary for membrane fusion. Thus, while the intramolecular disulfide bonds of GP64 appear to serve critical roles in membrane fusion, the unusual intermolecular disulfide bond was not critical for membrane fusion or virion budding yet appears to play an unknown role in viral infectivity." @default.
• W2023224591 created "2016-06-24" @default.
• W2023224591 creator A5002900514 @default.
• W2023224591 creator A5039074069 @default.
• W2023224591 date "2010-09-01" @default.
• W2023224591 modified "2023-10-16" @default.
• W2023224591 title "Baculovirus GP64 Disulfide Bonds: the Intermolecular Disulfide Bond of <i>Autographa californica</i> Multicapsid Nucleopolyhedrovirus GP64 Is Not Essential for Membrane Fusion and Virion Budding" @default.
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• W2023224591 doi "https://doi.org/10.1128/jvi.00264-10" @default.
• W2023224591 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2918989" @default.
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