FN3-based monobodies selective for the receptor binding domain of the SARS-CoV-2 spike protein.

FN3-based monobodies selective for the receptor binding domain of the SARS-CoV-2 spike protein.
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SARS-COV-2尖峰蛋白的受体结合结构域选择性基于FN3的单体反应。

DOI:
10.1016/j.nbt.2021.01.010
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发表时间:
2021-05-25
期刊:
影响因子:
5.4
通讯作者:
Kay BK
Kay BK
中科院分区:
工程技术2区
文献类型:
--
作者:
Miller CJ;McGinnis JE;Martinez MJ;Wang G;Zhou J;Simmons E;Amet T;Abdeen SJ;Van Huysse JW;Bowsher RR;Kay BK

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A phage library displaying 1010 variants of the fibronectin type III (FN3) domain was affinity selected with the biotinylated form of the receptor binding domain (RBD, residues 319–541) of the SARS-CoV-2 virus spike protein. Nine binding FN3 variants (i.e. monobodies) were recovered, representing four different primary structures. Soluble forms of the monobodies bound to several different preparations of the RBD and the S1 spike subunit, with affinities ranging from 3 to 14 nM as measured by bio-layer interferometry. Three of the four monobodies bound selectively to the RBD of SARS-CoV-2, with the fourth monobody showing slight cross-reactivity to the RBD of SARS-CoV-1 virus. Examination of binding to the spike fragments and its trimeric form revealed that the monobodies recognise at least three overlapping epitopes on the RBD of SARS-CoV-2. While pairwise tests failed to identify a monobody pair that could bind simultaneously to the RBD, one monobody could simultaneously bind to the RBD with the ectodomain of the cellular receptor angiotensin converting enzyme 2 (ACE2). All four monobodies successfully bound the RBD after overexpression in Chinese hamster ovary (CHO) cells as fusions to the Fc domain of human IgG1.
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