title: Correlated mutations at gp120 positions 322 and 440: implications for gp120 structure.
abstract: Analysis of V3 and C4 sequences of HIV-1 reveals correlated mutations at gp120 positions 322 and 440, and a very strong preference for a positively charged residue at position 440 when position 322 is negatively charged. This observation suggests that these two residues are close to each other and interact electrostatically in R5 viruses. This interaction was used to model V3 in the context of gp120 using NMR data for the V3 loop and the crystal structure of the gp120-core. The interaction between residues 322 and 440 may serve as part of the molecular switch for HIV-1 phenotype conversion.
authors.affiliation: Department of Structural Biology, Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Osnat
authors.initials: O
authors.lastname: Rosen
authors.forename: Avraham O
authors.initials: AO
authors.lastname: Samson
authors.forename: Jacob
authors.initials: J
authors.lastname: Anglister
mesh_terms: D019943:Amino Acid Substitution / Q000235:genetics; D030541:Databases, Genetic; D015699:HIV Envelope Protein gp120 / Q000737:chemistry* / Q000235:genetics*; D015497:HIV-1 / Q000737:chemistry* / Q000235:genetics; D009154:Mutation; D010641:Phenotype; D017433:Protein Structure, Secondary / Q000235:genetics; D055672:Static Electricity
chemical_list: D015699:HIV Envelope Protein gp120