The Tetrameric Plant Lectin BanLec Neutralizes HIV through Bidentate Binding to Specific Viral Glycans.

The Tetrameric Plant Lectin BanLec Neutralizes HIV through Bidentate Binding to Specific Viral Glycans.
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DOI:
10.1016/j.str.2017.03.015
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发表时间:
2017-05-02
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Struwe WB
Struwe WB
中科院分区:
其他
文献类型:
--
作者:
Hopper JTS;Ambrose S;Grant OC;Krumm SA;Allison TM;Degiacomi MT;Tully MD;Pritchard LK;Ozorowski G;Ward AB;Crispin M;Doores KJ;Woods RJ;Benesch JLP;Robinson CV;Struwe WB

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选择凝集素具有强大的抗病毒特性,通过靶向病毒上的密集聚糖盾有效地中和HIV-1。在这里,我们揭示了最有效的凝集素之一,BanLec,实现其抑制的机制。我们确定,BanLec承认高甘露糖聚糖的一个子集,通过双齿相互作用跨越两个结合位点存在于每个BanLec单体,以前被认为是单独的碳水化合物识别域。我们表明,这两个网站所需的高亲和力聚糖结合和病毒中和。出乎意料的是,我们发现BanLec在溶液中采用四聚体化学计量,由此聚糖结合位点被定位为最佳靶向糖基化病毒刺突。四聚体结构,连同与单个聚糖的双齿结合,导致多价层,其通过增强的亲合力效应驱动病毒中和。这些结构的见解将证明是有用的工程成功的凝集素治疗靶向密集聚糖盾的艾滋病毒。
Select lectins have powerful anti-viral properties that effectively neutralize HIV-1 by targeting the dense glycan shield on the virus. Here, we reveal the mechanism by which one of the most potent lectins, BanLec, achieves its inhibition. We identify that BanLec recognizes a subset of high-mannose glycans via bidentate interactions spanning the two binding sites present on each BanLec monomer that were previously considered separate carbohydrate recognition domains. We show that both sites are required for high-affinity glycan binding and virus neutralization. Unexpectedly we find that BanLec adopts a tetrameric stoichiometry in solution whereby the glycan-binding sites are positioned to optimally target glycosylated viral spikes. The tetrameric architecture, together with bidentate binding to individual glycans, leads to layers of multivalency that drive viral neutralization through enhanced avidity effects. These structural insights will prove useful in engineering successful lectin therapeutics targeting the dense glycan shield of HIV.
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