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. 2021 Jul 28;108:107997. doi: 10.1016/j.jmgm.2021.107997

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Fig. 9 — Interaction mode of the extracellular domain of CD26 and ACE2 with the RBD domain of SARS-CoV-2 spike as well as CD26 with MERS. The surface representation of complexes that has resulted from molecular docking by HADDOCK. A) ACE2/RBD-SARS-CoV-2, B) CD26/RBD-SARS-CoV-2 and C) CD26/MERS. RBD-SARS-CoV-2 and MERS are colored in cyan and wheat. Close-up view of the stick representation of amino acids (AA) involved in the interactions of proteins that are colored in red (inside the box) and green (bold-italic/outside) for receptors and RBD-SARS-CoV-2/MERS, respectively. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)