HIV-1 gp41 six-helix bundle formation occurs rapidly after the engagement of gp120 by CXCR4 in the HIV-1 Env-mediated fusion process

Biochemistry. 2001 Oct 16;40(41):12231-6. doi: 10.1021/bi0155596.


The onset of cell fusion mediated by HIV-1 IIIB Env is preceded by a lag phase of 15-20 min. Fusion mediated by the CD4-independent HIV-1 Env 8x, which is capable of interacting directly with CXCR4, proceeds with a greatly reduced lag phase. We probed the intermediate steps during the lag phase in HIV-1 IIIB Env-mediated fusion with Leu3-a, an inhibitor of attachment of gp120 to CD4, AMD3100, an inhibitor of attachment of gp120 to CXCR4, and C34, a synthetic peptide that interferes with the transition of gp41 to the fusion active state. Inhibitions of fusion as a function of time of addition of C34 and of AMD3100 were equivalent, indicating that engagement of gp120 by CXCR4 and formation of the gp41 six-helix bundle follow similar kinetics. The initial steps in fusion mediated by the CD4-independent Env 8x are too rapid for these inhibitors to interfere with. However, when 8x Env-expressing cells were incubated with target cells at 25 degrees C in the presence of AMD3100 or C34, prior to incubation at 37 degrees C, these inhibitors were capable of inhibiting 8x Env-mediated fusion. To further examine engagement of gp120 by CXCR4 and exposure of binding sites for C34, we have reversibly arrested the fusion reaction at 37 degrees C by adding cytochalasin B to the medium. We show that CXCR4 engagement and six-helix bundle formation only occur after the release of the cytochalasin arrest, indicating that a high degree of cooperativity is required to trigger the initial steps in HIV-1 Env-mediated fusion.

MeSH terms

  • Amino Acid Sequence
  • Binding Sites
  • Cytochalasin B / pharmacology
  • Gene Products, env / physiology
  • HIV Envelope Protein gp120 / physiology*
  • HIV Envelope Protein gp41 / chemistry*
  • HIV Envelope Protein gp41 / physiology*
  • HIV-1 / pathogenicity*
  • HIV-1 / physiology*
  • HeLa Cells
  • Humans
  • Kinetics
  • Membrane Fusion / drug effects
  • Membrane Fusion / physiology*
  • Molecular Sequence Data
  • Peptides / chemistry
  • Peptides / pharmacology
  • Protein Structure, Secondary
  • Receptors, CXCR4 / physiology*


  • Gene Products, env
  • HIV Envelope Protein gp120
  • HIV Envelope Protein gp41
  • Peptides
  • Receptors, CXCR4
  • Cytochalasin B