Molecular models of gp45 were created on the basis of values from Table 3. V163 is blue, S158 is green, T168 is pink, and W91 is purple. (A) Gp45A open in-plane in solution. (B) Gp45D in the presence of gp44/62 and ATP open further in-plane. (C) Gp45H in the presence of gp44/62, ATP, and DNA closes out-of plane. (D) Gp45K in the presence of gp44/62, ATP, DNA, and gp43 closes further in-plane.