Crystal structure of MERS-CoV RBD (PDB 4L3N) [19].

<p>The core structure of RBD is in cyan, and RBM in red. Helices are drawn as cylinders, and strands as arrows. Disulfide bond linked cysteines are shown as sticks in yellow. The N- and C-termini of the crystallized protein fragment are shown as N* and C*, respectively. The disordered region on the N-terminus of the RBD is shown as a dashed line. The boundaries of the RBD and of the RBM are labeled by their residue numbers.