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10.1021/acsomega.0c03512

http://scihub22266oqcxt.onion/10.1021/acsomega.0c03512
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33458462!7771249!33458462
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suck abstract from ncbi


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pmid33458462      ACS+Omega 2021 ; 6 (1): 85-102
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  • Characterization of the SARS-CoV-2 S Protein: Biophysical, Biochemical, Structural, and Antigenic Analysis #MMPMID33458462
  • Herrera NG; Morano NC; Celikgil A; Georgiev GI; Malonis RJ; Lee JH; Tong K; Vergnolle O; Massimi AB; Yen LY; Noble AJ; Kopylov M; Bonanno JB; Garrett-Thomson SC; Hayes DB; Bortz RH 3rd; Wirchnianski AS; Florez C; Laudermilch E; Haslwanter D; Fels JM; Dieterle ME; Jangra RK; Barnhill J; Mengotto A; Kimmel D; Daily JP; Pirofski LA; Chandran K; Brenowitz M; Garforth SJ; Eng ET; Lai JR; Almo SC
  • ACS Omega 2021[Jan]; 6 (1): 85-102 PMID33458462show ga
  • Coronavirus disease 2019 (COVID-19) is a global health crisis caused by the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and there is a critical need to produce large quantities of high-quality SARS-CoV-2 Spike (S) protein for use in both clinical and basic science settings. To address this need, we have evaluated the expression and purification of two previously reported S protein constructs in Expi293F and ExpiCHO-S cells, two different cell lines selected for increased protein expression. We show that ExpiCHO-S cells produce enhanced yields of both SARS-CoV-2 S proteins. Biochemical, biophysical, and structural (cryo-EM) characterizations of the SARS-CoV-2 S proteins produced in both cell lines demonstrate that the reported purification strategy yields high-quality S protein (nonaggregated, uniform material with appropriate biochemical and biophysical properties), and analysis of 20 deposited S protein cryo-EM structures reveals conformation plasticity in the region composed of amino acids 614-642 and 828-854. Importantly, we show that multiple preparations of these two recombinant S proteins from either cell line exhibit identical behavior in two different serology assays. We also evaluate the specificity of S protein-mediated host cell binding by examining interactions with proposed binding partners in the human secretome and report no novel binding partners and notably fail to validate the Spike:CD147 interaction. In addition, the antigenicity of these proteins is demonstrated by standard ELISAs and in a flexible protein microarray format. Collectively, we establish an array of metrics for ensuring the production of high-quality S protein to support clinical, biological, biochemical, structural, and mechanistic studies to combat the global pandemic caused by SARS-CoV-2.
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