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The unknotted strands of life: knots are very rare in RNA structures

Abstract : The ongoing effort to detect and characterize physical entanglement in biopolymers has so far established that knots are present in many globular proteins and also abound in viral DNA packaged inside bacteriophages. RNA molecules, on the other hand, have not yet been systematically screened for the occurrence of physical knots. We have accordingly undertaken the systematic profiling of the ~6,000 RNA structures present in the protein data bank. The search identified no more than three deeply-knotted RNA molecules. These are ribosomal RNAs solved by cryo-em and consist of about 3,000 nucleotides. Compared to the case of proteins and viral DNA, the observed incidence of RNA knots is therefore practically negligible. This suggests that either evolutionary selection, or thermodynamic and kinetic folding mechanisms act towards minimizing the entanglement of RNA to an extent that is unparalleled by other types of biomolecules. The properties of the three observed RNA knotting patterns provide valuable clues for designing RNA sequences capable of self-tying in a twist-knot fold.
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Preprints, Working Papers, ...
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Contributor : Emmanuelle de Laborderie <>
Submitted on : Thursday, November 26, 2015 - 12:03:11 PM
Last modification on : Monday, February 10, 2020 - 6:13:40 PM

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  • HAL Id : cea-01234151, version 1
  • ARXIV : 1410.1549



Cristian Micheletti, Marco Di Stefano, Henri Orland. The unknotted strands of life: knots are very rare in RNA structures. 2015. ⟨cea-01234151⟩



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