A G-quadruplex-containing RNA activates fluorescence in a GFP-like fluorophore.

A G-quadruplex-containing RNA activates fluorescence in a GFP-like fluorophore.
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含有 G-四链体的 RNA 会激活类 GFP 荧光团中的荧光。

DOI:
10.1038/nchembio.1561
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发表时间:
2014-08
影响因子:
14.8
通讯作者:
Piccirilli, Joseph A.
Piccirilli, Joseph A.
中科院分区:
生物学1区
文献类型:
--
作者:
Huang, Hao;Suslov, Nikolai B.;Li, Nan-Sheng;Shelke, Sandip A.;Evans, Molly E.;Koldobskaya, Yelena;Rice, Phoebe A.;Piccirilli, Joseph A.

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Spinach is an in vitro selected RNA aptamer that binds a GFP-like ligand and activates its green fluorescence.Spinach is thus an RNA analog of GFP, and has potentially widespread applications for in vivo labeling and imaging. We used antibody-assisted crystallography to determine the structures of Spinach both with and without bound fluorophore at 2.2 and 2.4 Å resolution, respectively. Spinach RNA has an elongated structure containing two helical domains separated by an internal bulge that folds into a G-quadruplex motif of unusual topology. The G-quadruplex motif and adjacent nucleotides comprise a partially pre-formed binding site for the fluorophore.The fluorophore binds in a planar conformation and makes extensive aromatic stacking and hydrogen bond interactions with the RNA. Our findings provide a foundation for structure-based engineering of new fluorophore-binding RNA aptamers.
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