Ontology type: schema:ScholarlyArticle Open Access: True
2014-12
AUTHORSBenjamin Radestock, Robin Burk, Barbara Müller, Hans-Georg Kräusslich
ABSTRACTBACKGROUND: HIV-1 formation is driven by the viral structural polyprotein Gag, which assembles at the plasma membrane into a hexagonal lattice. The C-terminal p6(Gag) domain harbors short peptide motifs, called late domains, which recruit the cellular endosomal sorting complex required for transport and promote HIV-1 abscission from the plasma membrane. Similar to late domain containing proteins of other viruses, HIV-1 p6 is phosphorylated at multiple residues, including a highly conserved serine at position 40. Previously published studies showed that an S40F exchange in p6(Gag) severely affected virus infectivity, while we had reported that mutation of all phosphorylatable residues in p6(Gag) had only minor effects. FINDINGS: We introduced mutations into p6(Gag) without affecting the overlapping pol reading frame by using an HIV-1 derivative where gag and pol are genetically uncoupled. HIV-1 derivatives with a conservative S40N or a non-conservative S40F exchange were produced. The S40F substitution severely affected virus maturation and infectivity as reported before, while the S40N exchange caused no functional defects and the variant was fully infectious in T-cell lines and primary T-cells. CONCLUSIONS: An HIV-1 variant carrying a conservative S40N exchange in p6(Gag) is fully functional in tissue culture demonstrating that neither S40 nor its phosphorylation are required for HIV-1 release and maturation. The phenotype of the S40F mutation appears to be caused by the bulky hydrophobic residue introduced into a flexible region. More... »
PAGES114
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