Figure 1.

(A) Side and (B) top views of the CG CA monomer structure (spheres) alongside the all-atom template structure backbone (transparent ribbons). NTD of CA are represented as darker gray spheres (blue online), CTD as lighter gray; location of harmonic restraint on helix 9 for the flexible dimer model indicated with arrows. (C and D) Superpositions of the CG CA monomer onto the various experimental hexamer and pentamer structures, with monomer colors varied for clarity. (E–G) Also shown are a side view of (E) and views from above (F) and below (G) the HIV-1 CA dimer model structure, with flexible dimer restraint indicated with arrows.