Figure 6. Effect of p₂₂ conformational state on Mg²⁺-p₂₂A₂₂ distances.

The distances between the OP2 and O3′ atoms of p₂₂ and A₂₂ (d(O2P(p₂₂)-N7(A₂₂)), indicated by a dashed red line; (d(O3′ (p₂₂)-N7(A₂₂) by a dashed blue line) depend on the conformational state of p₂₂, represented here by (ε-ζ) p₂₂ values. When Mg²⁺ interacts with A₂₂ and G₂₃, d(Mg²⁺-O2P(p₂₂)) (red) and d(Mg²⁺-O3′ (p₂₂)) (blue) are parallel to d(O2P(p₂₂)-N7(A₂₂)) and d(O3′ (p₂₂)-N7(A₂₂), respectively. The standard deviations for distances are 1.2 Å. The distances were examined on the two groups of structures defined in Figure 5 caption.