Structure and Mechanism of a Metal-Sensing Regulatory RNA

Charles E. Dann, Catherine A. Wakeman, Cecelia L. Sieling, Stephanie C. Baker, Irnov Irnov, Wade C. Winkler

Research output: Contribution to journalArticlepeer-review

298 Scopus citations


Organisms maintain the correct balance of intracellular metals primarily through metal-sensing proteins that control transport and storage of the target ion(s). Here, we reveal the basis of metal sensing and genetic control by a metalloregulatory RNA. Our data demonstrate that a previously uncharacterized orphan riboswitch, renamed the "M-box," is a divalent metal-sensing RNA involved in Mg2+ homeostasis. A combination of genetic, biochemical, and biophysical techniques demonstrate that Mg2+ induces a compacted tertiary architecture for M-box RNAs that regulates the accessibility of nucleotides involved in genetic control. Molecular details are provided by crystallographic structure determination of a Mg2+-bound M-box RNA. Given the distribution of this RNA element, it may constitute a common mode for bacterial metal ion regulation, and its discovery suggests the possibility of additional RNA-based metal sensors in modern and primordial organisms.

Original languageEnglish
Pages (from-to)878-892
Number of pages15
Issue number5
StatePublished - Sep 7 2007


  • RNA


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