Fab-dimerized glycan-reactive antibodies are a structural category of natural antibodies.

Fab-dimerized glycan-reactive antibodies are a structural category of natural antibodies.
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DOI:
10.1016/j.cell.2021.04.042
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发表时间:
2021-05-27
期刊:
影响因子:
64.5
通讯作者:
Haynes BF
Haynes BF
中科院分区:
生物学1区
文献类型:
--
作者:
Williams WB;Meyerhoff RR;Edwards RJ;Li H;Manne K;Nicely NI;Henderson R;Zhou Y;Janowska K;Mansouri K;Gobeil S;Evangelous T;Hora B;Berry M;Abuahmad AY;Sprenz J;Deyton M;Stalls V;Kopp M;Hsu AL;Borgnia MJ;Stewart-Jones GBE;Lee MS;Bronkema N;Moody MA;Wiehe K;Bradley T;Alam SM;Parks RJ;Foulger A;Oguin T;Sempowski GD;Bonsignori M;LaBranche CC;Montefiori DC;Seaman M;Santra S;Perfect J;Francica JR;Lynn GM;Aussedat B;Walkowicz WE;Laga R;Kelsoe G;Saunders KO;Fera D;Kwong PD;Seder RA;Bartesaghi A;Shaw GM;Acharya P;Haynes BF

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天然抗体 (Abs) 可以靶向病原体表面的宿主聚糖。我们使用糖基化 HIV-1 包膜 (Env) 作为模型抗原,研究了恒河猴和人类的聚糖反应性 B 细胞的进化。 2G12 是一种广泛中和抗体 (bnAb),它使用独特的重链 (VH) 结构域交换结构,靶向不同地理位置的 HIV-1 毒株 Env 上的保守聚糖补丁,从而导致片段抗原结合 (Fab) 二聚化。在这里,我们描述了来自猿猴人类免疫缺陷病毒(SHIV)感染的猕猴的没有 VH 交换结构域的 HIV-1 Env Fab 二聚聚糖(FDG)反应性 bnAb。 FDG Abs 还识别多种病原体上的细胞表面聚糖,包括酵母和严重急性呼吸综合征冠状病毒 2 (SARS-CoV-2) 刺突。 FDG 前体在猕猴中被携带聚糖的免疫原扩增,并且在未经 HIV-1 感染的人类中含量丰富。此外,FDG 前体主要是突变的 IgM+IgD+CD27+,因此表明它们起源于一群经历过抗原的 IgM+ 或边缘区 B 细胞。结构和功能分析鉴定了猕猴和人类中的一类聚糖反应性抗体,其特征是抗原结合片段的二聚化。这些抗体参与 HIV 中和,并识别 SARS-CoV-2 的 S2 蛋白。
Natural antibodies (Abs) can target host glycans on the surface of pathogens. We studied the evolution of glycan-reactive B cells of rhesus macaques and humans using glycosylated HIV-1 envelope (Env) as a model antigen. 2G12 is a broadly neutralizing Ab (bnAb) that targets a conserved glycan patch on Env of geographically diverse HIV-1 strains using a unique heavy-chain (VH) domain-swapped architecture that results in fragment antigen-binding (Fab) dimerization. Here, we describe HIV-1 Env Fab-dimerized glycan (FDG)-reactive bnAbs without VH-swapped domains from simian-human immunodeficiency virus (SHIV)-infected macaques. FDG Abs also recognized cell-surface glycans on diverse pathogens, including yeast and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike. FDG precursors were expanded by glycan-bearing immunogens in macaques and were abundant in HIV-1-naive humans. Moreover, FDG precursors were predominately mutated IgM+IgD+CD27+, thus suggesting that they originated from a pool of antigen-experienced IgM+ or marginal zone B cells. Structural and functional analyses identify a category of glycan-reactive antibodies in macaques and humans that are marked by the dimerization of the antigen-binding fragment. These antibodies are involved in HIV neutralization and also recognize the S2 protein of SARS-CoV-2.
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