Figure 1.

(Left) Scheme of parallel-stranded GQ and basket type GQ for comparison. Orientation of guanine strands is indicated by arrows. Propeller loops are cyan, lateral loops are pink and a diagonal loop is blue. (Middle and right) Simulated systems: stacked dimer of two bimolecular GQs containing four UUA loops (the experimental structure), a bimolecular GQ with two propeller loops and isolated PH. Different RNA chains are distinguished by different colors of their backbone. Frame around a nucleobase indicates its involvement in stacking interactions.