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Observed variability of the second A-minor interhelical interaction in the K-turns involving the second conserved adenosine of the NC-stem and the first basepair of the C-stem. (a) Direct H-bonding A-minor type I interaction in Kt-77 from T. thermophilus 23S rRNA (Nikulin et al., 2003). (b) Water-inserted A-minor type I interaction (H. marismortui 23S rRNA, Kt-7). (c) A-minor type 0 interaction (H. marismortui 23S rRNA, Kt-46).
