• Authors: He WT. et al.
  • Year: 2022
  • Journal: Nat Immunol 23 960-970
  • Applications: in vitro / DNA / FectoPRO
  • Cell type: Expi293F
    Description: Human embryonic kidney Fibroblast
    Known as: Expi 293-F, Expi, HEK-293 Expi


To express mAbs, the HC and LC gene segments that were cloned into corresponding expression vectors were transfected into Expi293 cells (Thermo Fisher Scientific) (2–3 million cells ml−1) using the FectoPRO reagent (catalog no. 116-040; Polyplus) for a final expression volume of 2, 4 or 50 ml. After approximately 24 h, sodium valproic acid and glucose were added to the cells at a final concentration of 300 mM each. Cells were allowed to incubate for an additional 4 d to allow for mAb expression.


The emergence of current severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern (VOCs) and potential future spillovers of SARS-like coronaviruses into humans pose a major threat to human health and the global economy. Development of broadly effective coronavirus vaccines that can mitigate these threats is needed. Here, we utilized a targeted donor selection strategy to isolate a large panel of human broadly neutralizing antibodies (bnAbs) to sarbecoviruses. Many of these bnAbs are remarkably effective in neutralizing a diversity of sarbecoviruses and against most SARS-CoV-2 VOCs, including the Omicron variant. Neutralization breadth is achieved by bnAb binding to epitopes on a relatively conserved face of the receptor-binding domain (RBD). Consistent with targeting of conserved sites, select RBD bnAbs exhibited protective efficacy against diverse SARS-like coronaviruses in a prophylaxis challenge model in vivo. These bnAbs provide new opportunities and choices for next-generation antibody prophylactic and therapeutic applications and provide a molecular basis for effective design of pan-sarbecovirus vaccines.