The kink-turn motif in RNA is dimorphic, and metal ion-dependent.

@article{Goody2004TheKM,
  title={The kink-turn motif in RNA is dimorphic, and metal ion-dependent.},
  author={Terry A Goody and Sonya E Melcher and David G Norman and David M. J. Lilley},
  journal={RNA},
  year={2004},
  volume={10 2},
  pages={254-64}
}
The kink-turn (K-turn) is a new motif in RNA structure that was identified by examination of the crystal structures of the ribosome. We examined the structural and dynamic properties of this element in free solution. The K-turn RNA exists in a dynamic equilibrium between a tightly kinked conformation and a more open structure similar to a simple bulge bend. The highly kinked form is stabilized by the noncooperative binding of metal ions, but a significant population of the less-kinked form is… CONTINUE READING
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