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EF affects S protein binding to ACE2 receptor. S protein (RBD)-coated ELISA plates were incubated with increasing EF concentrations and subsequently the binding of biotinylated ACE2 receptors was quantified by measurement of chemiluminescence (% Inhibition, IH). As a positive control, ACE2 was co-incubated with immunized patient sera, which inhibited more than 71.5% of ACE2 receptor binding. EF at 50 µg/mL inhibited S protein binding, up to 21.0% to ACE2 (p < 0.05).
