Fluoride ion encapsulation by Mg2+ ions and phosphates in a fluoride riboswitch.

Fluoride ion encapsulation by Mg2+ ions and phosphates in a fluoride riboswitch.
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DOI:
10.1038/nature11152
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发表时间:
2012-05-13
期刊:
影响因子:
64.8
通讯作者:
Patel, Dinshaw J.
Patel, Dinshaw J.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ren, Aiming;Rajashankar, Kanagalaghatta R.;Patel, Dinshaw J.

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Significant advances in our understanding of RNA architecture, folding and recognition have emerged from structure-function studies on riboswicthes, non-coding RNAs whose sensing domains bind small ligands and whose adjacent expression platforms contain RNA elements involved in the control of gene regulation. We now report on the ligand-bound structure of the Thermotoga petrophila fluoride riboswitch, which adopts a higher-order RNA architecture stabilized by pseudoknot and long-range reversed Watson-Crick and Hoogsteen A•U pair formation. The bound fluoride ion is encapsulated within the junctional architecture, anchored in place through direct coordination to three Mg2+ ions, which in turn are octahedrally coordinated to waters and five inwardly-pointing backbone phosphates. Our structure of the fluoride riboswitch in the bound state defines how RNA can form a binding pocket selective for fluoride, while discriminating against larger halide ions. The T. petrophila fluoride riboswitch most likely functions in gene regulation through a transcription termination mechanism.
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