Structural stability, acidity, and halide selectivity of the fluoride riboswitch recognition site

Mohit Chawla, Raffaele Credendino, Albert Poater, Romina M. Oliva, Luigi Cavallo

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Using static and dynamics DFT methods we show that the Mg2+/F-/phosphate/water cluster at the center of the fluoride riboswitch is stable by its own and, once assembled, does not rely on any additional factor from the overall RNA fold. Further, we predict that the pKa of the water molecule bridging two Mg cations is around 8.4. We also demonstrate that the halide selectivity of the fluoride riboswitch is determined by the stronger Mg-F bond, which is capable of keeping together the cluster. Replacing F- with Cl- results in a cluster that is unstable under dynamic conditions. Similar conclusions on the structure and energetics of the cluster in the binding pocket of fluoride-inhibited pyrophosphatase suggest that the peculiarity of fluoride is in its ability to establish much stronger metal-halide bonds.
Original languageEnglish (US)
Pages (from-to)299-306
Number of pages8
JournalJournal of the American Chemical Society
Volume137
Issue number1
DOIs
StatePublished - Dec 23 2014

ASJC Scopus subject areas

  • Biochemistry
  • Colloid and Surface Chemistry
  • Chemistry(all)
  • Catalysis

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