Mn(2+)-sensing mechanisms of yybP-ykoY orphan riboswitches

Molecular Cell
Ian R PriceAilong Ke

Abstract

Gene regulation in cis by riboswitches is prevalent in bacteria. The yybP-ykoY riboswitch family is quite widespread, yet its ligand and function remained unknown. Here, we characterize the Lactococcus lactis yybP-ykoY orphan riboswitch as a Mn(2+)-dependent transcription-ON riboswitch, with a ∼30-40 μM affinity for Mn(2+). We further determined its crystal structure at 2.7 Å to elucidate the metal sensing mechanism. The riboswitch resembles a hairpin, with two coaxially stacked helices tethered by a four-way junction and a tertiary docking interface. The Mn(2+)-sensing region, strategically located at the highly conserved docking interface, has two metal binding sites. Whereas one site tolerates the binding of either Mg(2+) or Mn(2+), the other site strongly prefers Mn(2+) due to a direct contact from the N7 of an invariable adenosine. Mutagenesis and a Mn(2+)-free E. coli yybP-ykoY structure further reveal that Mn(2+) binding is coupled with stabilization of the Mn(2+)-sensing region and the aptamer domain.

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