Structure of the scaffolding protein and portal within the bacteriophage P22 procapsid provides insights into the self-assembly process
Fig 4
Interactions among the SP, portal proteins, and major capsid proteins.
(A) Distribution of the hooks (red) on the inner surface of the capsid surrounding the portal (the portal is not shown) (PDB ID: 8I1V). (B) The portal and a copy of the inner base-associated SP are presented (PDB ID: 8I1V, 9KYW). Two of the 12 portal subunits interacting with the SP are indicated in green, whereas the remaining subunits are indicated in magenta. The color scheme for the SP domains matches that in Fig 2G. (C) Side view of panel (B). (D) Hydrophobic interactions between the portal protein (surface view) and the C-loop of the SP (ribbon view). (E) Models of the SP and portal protein superimposed onto the density map (EMD-61461; PDB ID: 9KYW).