Charge reduction and thermodynamic stabilization of substrate RNAs inhibit RNA editing.

Charge reduction and thermodynamic stabilization of substrate RNAs inhibit RNA editing.
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DOI:
10.1371/journal.pone.0118940
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Göringer HU
Göringer HU
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Leeder WM;Reuss AJ;Brecht M;Kratz K;Wachtveitl J;Göringer HU

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African trypanosomes cause a parasitic disease known as sleeping sickness. Mitochondrial transcript maturation in these organisms requires a RNA editing reaction that is characterized by the insertion and deletion of U-nucleotides into otherwise non-functional mRNAs. Editing represents an ideal target for a parasite-specific therapeutic intervention since the reaction cycle is absent in the infected host. In addition, editing relies on a macromolecular protein complex, the editosome, that only exists in the parasite. Therefore, all attempts to search for editing interfering compounds have been focused on molecules that bind to proteins of the editing machinery. However, in analogy to other RNA-driven biochemical pathways it should be possible to stall the reaction by targeting its substrate RNAs. Here we demonstrate inhibition of editing by specific aminoglycosides. The molecules bind into the major groove of the gRNA/pre-mRNA editing substrates thereby causing a stabilization of the RNA molecules through charge compensation and an increase in stacking. The data shed light on mechanistic details of the editing process and identify critical parameters for the development of new trypanocidal compounds.
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