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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. 2.

Fig. 2

Components of UGGGGU octamer assembly. (a) An isolated RNA hexamer, the 3′ uridine that participates in a U tetrad, is shown in blue, and the 5′ uridine involved in tetramer intercalation is shown in cyan. Two central Sr2+ cations involved in G-quartet stabilization are shown in magenta. (b) The tetramer component produced by rotation of an individual strand about a 4-fold axis. (c) Two adjacent, stacked, strands related by 2-fold symmetry and (d) the resulting octamer. Coordinates correspond to data set P1B.