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J. Virol., 06 1995, 3771-3777, Vol 69, No. 6
CH Chen, TJ Matthews, CB McDanal, DP Bolognesi and ML Greenberg
We have previously reported that synthetic peptides representing the
leucine zipper domain (DP107) and a second putative helical domain (DP178)
of human immunodeficiency virus type 1 (HIV-1) gp41 exhibit potent anti-HIV
activity. In this study we have used soluble recombinant forms of gp41 to
provide evidence that the DP178 peptide and the DP178 region of gp41
associate with a distal site on the gp41 transmembrane protein whose
interactive structure is influenced by the leucine zipper (DP107) motif. We
also observed that a single coiled- coil-disrupting mutation in the leucine
zipper domain transformed the recombinant gp41 protein from an inactive to
an active inhibitor of HIV- 1 fusion and infectivity, which may be related
to that finding. We speculate that this transformation results from
liberation of the potent DP178-related sequence from a molecular clasp with
a leucine zipper, DP107, determinant. The results are discussed in the
context of two distinct conformations for the gp41 molecule and possible
involvement of these two domains in structural transitions associated with
HIV-1-mediated fusion. The results are also interpreted to suggest that the
anti-HIV activity of the various gp41 derivatives (peptides and recombinant
proteins) may be due to their ability to form complexes with viral gp41 and
interfere with its fusogenic processes.
Copyright © 1995, American Society for Microbiology
A molecular clasp in the human immunodeficiency virus (HIV) type 1 TM protein determines the anti-HIV activity of gp41 derivatives: implication for viral fusion
Department of Surgery, Duke University Medical Center, Durham, North Carolina 27710, USA.
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