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• W2164044487 endingPage "9938" @default.
• W2164044487 startingPage "9925" @default.
• W2164044487 abstract "The amphipathic alpha-helices located in the cytoplasmic tail of the envelope (Env) transmembrane glycoprotein gp41 of human immunodeficiency virus type 1 have been implicated in membrane association and cytopathicity. Deletion of the last 12 amino acids in the C terminus of this domain severely impairs infectivity. However, the nature of the involvement of the cytoplasmic tail in Env-membrane interactions in cells and the molecular basis for the defect in infectivity of this mutant virus are still poorly understood. In this study we examined the interaction of the cytoplasmic tail with membranes in living mammalian cells by expressing a recombinant cytoplasmic tail fragment and an Escherichia coli beta-galactosidase/cytoplasmic tail fusion protein, both of them lacking gp120, the gp41 ectodomain, and the transmembrane region. We found through cell fractionation, in vivo membrane flotation, and confocal immunofluorescence studies that the cytoplasmic tail contained determinants to be routed to a perinuclear membrane region in cells. Further mapping showed that each of the three lentivirus lytic peptide (LLP-1, LLP-2, and LLP-3) sequences conferred this cellular membrane-targeting ability. Deletion of the last 12 amino acids from the C terminus abolished the ability of the LLP-1 motif to bind to membranes. High salt extraction, in vitro transcription and translation, and posttranslational membrane binding analyses indicated that the beta-galactosidase/LLP fusion proteins were inserted into membranes via the LLP sequences. Subcellular fractionation and confocal microscopy studies revealed that each of the LLP motifs, acting in a position-independent manner, targeted non-endoplasmic reticulum (ER)-associated beta-galactosidase and enhanced green fluorescence protein to the ER. Our study provides a basis for the involvement of the gp41 cytoplasmic tail during Env maturation and also supports the notion that the membrane apposition of the C-terminal cytoplasmic tail plays a crucial role in virus-host interaction." @default.
• W2164044487 created "2016-06-24" @default.
• W2164044487 creator A5027692909 @default.
• W2164044487 creator A5037950005 @default.
• W2164044487 creator A5055450994 @default.
• W2164044487 date "2001-10-15" @default.
• W2164044487 modified "2023-09-24" @default.
• W2164044487 title "Cellular Membrane-Binding Ability of the C-Terminal Cytoplasmic Domain of Human Immunodeficiency Virus Type 1 Envelope Transmembrane Protein gp41" @default.
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• W2164044487 doi "https://doi.org/10.1128/jvi.75.20.9925-9938.2001" @default.
• W2164044487 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/114564" @default.
• W2164044487 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11559825" @default.
• W2164044487 hasPublicationYear "2001" @default.
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