Site-specific N-glycosylation Characterization of Recombinant SARS-CoV-2 Spike Proteins

Site-specific N-glycosylation Characterization of Recombinant SARS-CoV-2 Spike Proteins
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重组 SARS-CoV-2 刺突蛋白的位点特异性 N-糖基化表征

DOI:
10.1101/2020.03.28.013276
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发表时间:
2020-03
期刊:
Molecular Cellular Proteomics
影响因子:
--
通讯作者:
Hao Yang
Hao Yang
中科院分区:
其他
文献类型:
--
作者:
Yong Zhang;Wanjun Zhao;Yonghong Mao;Yaohui Chen;Shisheng Wang;Yi Zhong;Tao Su;Meng Gong;Dan Du;Xiaofeng Lu;Jingqiu Cheng;Hao Yang

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SARS-CoV-2表面的糖蛋白刺突(S)是病毒入侵和宿主免疫应答的决定因素。在此,我们的特点是在完整的糖肽水平上的S蛋白的位点特异性N-糖基化。所有22个潜在的N-糖基位点在S-蛋白原聚体中被鉴定,并被发现在753个SARS-CoV-2基因组序列中被保留。糖基表现出糖型异质性,如对人细胞表达的蛋白质亚基的预期。我们确定了对应于157个N-聚糖的质量,主要是复合物类型。相反,昆虫细胞表达的S蛋白含有38个N-聚糖,主要是高甘露糖型。我们的研究结果表明,聚糖类型高度决定于人类和昆虫细胞之间的N-聚糖的差异加工。这种N-糖基化景观和不同宿主细胞之间的差异N-聚糖模式有望阐明感染机制,并为疫苗和靶向药物的开发提供积极的观点。
The glycoprotein spike (S) on the surface of SARS-CoV-2 is a determinant for viral invasion and host immune response. Herein, we characterized the site-specific N-glycosylation of S protein at the level of intact glycopeptides. All 22 potential N-glycosites were identified in the S-protein protomer and were found to be preserved among the 753 SARS-CoV-2 genome sequences. The glycosites exhibited glycoform heterogeneity as expected for a human cell-expressed protein subunits. We identified masses that correspond to 157 N-glycans, primarily of the complex type. In contrast, the insect cell-expressed S protein contained 38 N-glycans, primarily of the high-mannose type. Our results revealed that the glycan types were highly determined by the differential processing of N-glycans among human and insect cells. This N-glycosylation landscape and the differential N-glycan patterns among distinct host cells are expected to shed light on the infection mechanism and present a positive view for the development of vaccines and targeted drugs.
从严重的急性呼吸综合征(SARS)尖峰糖蛋白中鉴定N-连接的碳水化合物。
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