Identification of a human protein-derived HIV-1 fusion inhibitor targeting the gp41 fusion core structure.
Identification of a human protein-derived HIV-1 fusion inhibitor targeting the gp41 fusion core structure.
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针对 gp41 融合核心结构的人类蛋白质衍生 HIV-1 融合抑制剂的鉴定
DOI:
10.1371/journal.pone.0066156
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Chen YH
中科院分区:
文献类型:
--
作者:
Chao L;Lu L;Yang H;Zhu Y;Li Y;Wang Q;Yu X;Jiang S;Chen YH
The HIV-1 envelope glycoprotein (Env) gp41 plays a crucial role in the viral fusion process. The peptides derived from the C-terminal heptad repeat (CHR) of gp41 are potent HIV fusion inhibitors. However, the activity of these anti-HIV-1 peptides in vivo may be attenuated by their induction of anti-gp41 antibodies. Thus, it is essential to identify antiviral peptides or proteins with low, or no, immunogenicity to humans. Here, we found that the C-terminal fragment (aa 462–521) of the human POB1 (the partner of RalBP1), designated C60, is an HIV-1 fusion inhibitor. It bound to N36, the peptide derived from the N-terminal heptad repeat (NHR) of gp41, and to the six-helix bundle (6-HB) formed by N36 and C34, a CHR-peptide, but it did not bind to C34. Unlike the CHR-peptides, C60 did not block gp41 6-HB formation. Rather, results suggest that C60 inhibits HIV-1 fusion by binding to the 6-HB, in particular, the residues in the gp41 NHR domain that are exposed on the surface of 6-HB. Since 6-HB plays a crucial role in the late stage of fusion between the viral envelope and endosomal membrane during the endocytic process of HIV-1, C60 may serve as a host restriction factor to suppress HIV-1 entry into CD4+ T lymphocytes. Taken together, it can be concluded from these results that C60 can be used as a lead for the development of anti-HIV-1 therapeutics or microbicides for the treatment and prevention of HIV-1 infection, as well as a molecular probe to study the fusogenic mechanism of HIV-1.
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