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Structural prediction of D510G and I529T mutations in the RBD of S protein and their binding affinity to CD26. (A to C) Locations of D510 and I529 on the structure of the MERS-CoV RBD (red) and CD26 (blue). Amino acid residues that potentially interact with D510 or I529 are shown in gray. (D) Results of a surface plasmon resonance assay characterizing the specific binding between CD26 and wild-type (wt) and mutant MERS-CoV RBDs.
