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Structure of the SARS-CoV S2 core. (A) Ribbon representation of the S2 core structure. (B) Irregularity in the 3–4 repetition of the HR1 trimer. (C) An HR1-HR2 heterodimer. HR1 is blue and HR2 is red. (D) Electrostatic potential surface of the HR1 inner coil trimer with HR2 peptides shown as a ball-and-stick representation packing on the trimer grooves; two conserved glycosylation sites predicted at N1155 and N1176 of HR2 are indicated.
