Fig. 3: The portal protein and the surrounding capsid vertex.

a, Two opposing subunits of the portal protein (light blue) and the C1 cargo protein (purple) depicted as ribbons. b, Dodecameric assembly of the proteins shown in a, viewed along the channel axis. c, The portal protein wing region (light blue) interacting with C1 cargo protein subunits (purple). d,e, Molecular surface of the portal-containing capsid vertex, comprising major capsid protein gp32 (yellow), auxiliary capsid protein gp36 (dark blue) and portal protein gp20 (ribbon, light blue), viewed from inside the capsid along the central channel (d) and from outside the capsid (e) with the portal vertex auxiliary protein gp57 in green and the head fibre protein gp21 in pale blue. f, Ribbon diagram of the portal protein, depicting 12 subunits superimposed (left) and the oligomer viewed along the central axis (right) with capsid-adaptable loops shown in light blue and red corresponding to conformations A and B, respectively. g, Unit of the C₅ reconstructed portal-containing capsid vertex, with the gp57 (PVA) protein dimer shown as green ribbon. h, The gp57 dimer with inter-subunit disulfide bonds show in yellow. Numbers indicate terminal residues of the model.