Surface representation of the NusB-NusE-BoxA ternary complex from Aquifex aeolicus (Aa) illustrating protein-BoxA interactions. NusB residues are shown in cyan and NusE residues in orange as ball-and-stick models  (Stagno, Altieri, Bubunenko, Tarasov, Court, Byrd, and Ji. Nucl. Acids Res. June 7, 2011; Full Text).