PMC:7029759 / 27829-28493 JSONTXT

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Figure 2. TherapeuticDesign of the ACE2-Fc fusion protein as a therapy against 2019-nCoV coronavirus. ( A) The extracellular domain of ACE2 is appended onto the human immunoglobulin Fc domain, including the hinge region. The Fc domain facilitates dimerization of two ACE2 domains. ( B) The amino acid sequence of the ACE2-Fc fusion protein is provided. The ACE2 domain consists of amino acids 18–615 of the human ACE2 protein (blue; UniProtKB - Q9BYF1). The sequence of the human immunoglobulin G isotype 1 constant region is provided (green; UniProtKB - P01857). A secretion signal from a human immunoglobin heavy chain is provided (red; UniProtKB - A0A0C4DH39).