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. Author manuscript; available in PMC: 2016 Jun 19.
Published in final edited form as: J Mol Biol. 2015 Apr 8;427(12):2205–2219. doi: 10.1016/j.jmb.2015.03.022

Fig. 6.

Fig. 6

Structural variation in UGGGGU conformation. (a) Superposition of 16 RNA strands from four structures over residues 1–5 in 5′–3′ order [22] identifies three principal conformations for the 3′ uridine: 3′U-A (red), 3′U-B (green) and 3′ U-C (magenta). (b) ζ and α torsion angles for the three conformations fall into distinct clusters. (c) Alternate conformation of a phosphate group in UGGGGU structure P1A. Isocontours of a σA-weighted 2Fo − Fc density map contoured at 2.0σ are shown in blue; conformation A is shown in magenta and conformation B is shown in cyan.