Fig. 4: Binding of nucleotides and Mg2+ stabilizes the 650–668 helix.

CryoEM densities are shown at the 0.09 contour level in Chimera. The cryo-EM maps are shown at 2.4 σ, 1.8 σ, 1.5 σ, 1.7 σ from top to bottom.
CryoEM densities are shown at the 0.09 contour level in Chimera. The cryo-EM maps are shown at 2.4 σ, 1.8 σ, 1.5 σ, 1.7 σ from top to bottom.