Figure 3
The process of constraining PDB entry 3b77 into a tetragonal space group, P4, starting with a model (structure A2) that is intentionally solved in space group P2. The monoclinic asymmetric unit contains 12 polypeptide chains (labeled A–L). The twofold operator 2 of space group P2 generates a second asymmetric unit populated by chains A′–L′. The trial fourfold (marked by `?') maps chains A–F to chains G–L and maps chains G–L to chains A′–F′. |