Glycosylation site-specific analysis of clade C HIV-1 envelope proteins.

Glycosylation site-specific analysis of clade C HIV-1 envelope proteins.
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DOI:
10.1021/pr9002728
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发表时间:
2009-09
影响因子:
4.4
通讯作者:
Desaire, Heather
Desaire, Heather
中科院分区:
生物学2区
文献类型:
--
作者:
Go, Eden P.;Chang, Qing;Liao, Hua-Xin;Sutherland, Laura L.;Alam, S. Munir;Haynes, Barton F.;Desaire, Heather

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已知HIV-1包膜蛋白(Env)的广泛糖基化gp 120/gp 41通过掩蔽关键中和表位并将Env糖基化作为“自身”呈递给宿主免疫系统而在逃避宿主免疫应答中起重要作用。Env糖基化大多是保守的,但继续进化以调节病毒感染性。因此,分析Env糖基化和区分进化枝间和进化枝内糖基化变异是阐明糖基化对Env免疫原性的影响的必要组成部分。在这里,我们描述了一种基于质谱的方法来表征两个rVV表达的进化枝C Envs的糖基化概况,通过鉴定每个糖基化位点上的聚糖基序和确定糖基化位点占用的程度。一个Env是野生型Env,而另一个是合成的“共有”序列(C.CON)。两个进化枝C Env之间观察到的糖基化谱差异表明,C.CON具有更多未利用位点和高水平的高甘露糖聚糖;这些特征模拟了M组共有免疫原CON-S的糖基化谱。我们的结果还揭示了分支特异性糖基化模式。辨别进化枝间和进化枝内糖基化变异可以为理解不同HIV-1进化枝之间的分子差异和设计新的基于Env的免疫原提供有价值的信息。
The extensive glycosylation of HIV-1 envelope proteins (Env), gp120/gp41, is known to play an important role in evasion of host immune response by masking key neutralization epitopes and presenting the Env glycosylation as “self” to the host immune system. The Env glycosylation is mostly conserved but continues to evolve to modulate viral infectivity. Thus, profiling Env glycosylation and distinguishing interclade and intraclade glycosylation variations are necessary components in unraveling the effects of glycosylation on Env’s immunogenicity. Here, we describe a mass spectrometry-based approach to characterize the glycosylation profiles of two rVV-expressed clade C Envs by identifying the glycan motifs on each glycosylation site and determining the degree of glycosylation site occupancy. One Env is a wild-type Env, while the other is a synthetic “consensus” sequence (C.CON). The observed differences in the glycosylation profiles between the two clade C Envs show that C.CON has more unutilized sites and high levels of high mannose glycans; these features mimic the glycosylation profile of a Group M consensus immunogen, CON-S. Our results also reveal a clade-specific glycosylation pattern. Discerning interclade and intraclade glycosylation variations could provide valuable information in understanding the molecular differences among the different HIV-1 clades and in designing new Env-based immunogens.
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