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. Author manuscript; available in PMC: 2015 Nov 20.
Published in final edited form as: Nat Commun. 2014 Nov 20;5:5534. doi: 10.1038/ncomms6534

Figure 3. Formation of pairs of stacked base in the structure of the dU5-containing env22 twister ribozyme.

Figure 3

a, Alignment of P4 relative to the T2-P2-T1 continuous helical segment. The U5-A6 step at the cleavage site is shown in yellow. b, Stacking of A42•(C14-G25) and A43•(C13-G36) (shaded) A-minor triples. c, Stacking of U1•(A50-U33) and U4•(A49-A34) (shaded) major groove triples.