Small-molecule CD4 mimics interact with a highly conserved pocket on HIV-1 gp120.

Small-molecule CD4 mimics interact with a highly conserved pocket on HIV-1 gp120.
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DOI:
10.1016/j.str.2008.09.005
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发表时间:
2008-11-12
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Sodroski J
Sodroski J
中科院分区:
其他
文献类型:
--
作者:
Madani N;Schön A;Princiotto AM;Lalonde JM;Courter JR;Soeta T;Ng D;Wang L;Brower ET;Xiang SH;Kwon YD;Huang CC;Wyatt R;Kwong PD;Freire E;Smith AB 3rd;Sodroski J

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人类免疫缺陷病毒(HIV-1)与主要受体CD 4的相互作用诱导病毒包膜糖蛋白的构象变化,从而允许与CCR 5第二受体结合并使病毒进入宿主细胞。小分子NBD-556通过结合gp 120外包膜糖蛋白模拟CD 4,适度抑制病毒进入表达CD 4的靶细胞,并增强CCR 5结合和病毒进入缺乏CD 4的表达CCR 5的细胞。对NBD-556类似物和gp 120突变体的研究表明:1)NBD-556结合在Phe 43空腔内,这是一个高度保守的、功能重要的口袋,形成为gp 120呈现CD 4结合构象; 2)NBD-556苯环突出到Phe 43空腔内; 3)NBD-556增强CD 4非依赖性感染需要诱导gp 120的构象变化;和4)NBD-556类似物对gp 120的增加的亲和力在感染表达CD 4的细胞期间改善抗病毒效力。
Human immunodeficiency virus (HIV-1) interaction with the primary receptor, CD4, induces conformational changes in the viral envelope glycoproteins that allow binding to the CCR5 second receptor and virus entry into the host cell. The small molecule NBD-556 mimics CD4 by binding the gp120 exterior envelope glycoprotein, moderately inhibiting virus entry into CD4-expressing target cells, and enhancing CCR5 binding and virus entry into CCR5-expressing cells lacking CD4. Studies of NBD-556 analogues and gp120 mutants suggest that: 1) NBD-556 binds within the Phe 43 cavity, a highly conserved, functionally important pocket formed as gp120 assumes the CD4-bound conformation; 2) the NBD-556 phenyl ring projects into the Phe 43 cavity; 3) enhancement of CD4-independent infection by NBD-556 requires the induction of conformational changes in gp120; and 4) increased affinity of NBD-556 analogues for gp120 improves antiviral potency during infection of CD4-expressing cells.
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