Site-specific isotope labeling of long RNA for structural and mechanistic studies.

Site-specific isotope labeling of long RNA for structural and mechanistic studies.
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DOI:
10.1093/nar/gkr951
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发表时间:
2012-01
影响因子:
14.9
通讯作者:
Tanaka Y
Tanaka Y
中科院分区:
生物学2区
文献类型:
--
作者:
Kawahara I;Haruta K;Ashihara Y;Yamanaka D;Kuriyama M;Toki N;Kondo Y;Teruya K;Ishikawa J;Furuta H;Ikawa Y;Kojima C;Tanaka Y

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建立了长RNA分子的位点特异性同位素标记技术。该技术由两个简单的酶促反应组成,即I组自剪接内含子的鸟苷转移反应和与T4 DNA连接酶的连接。反式作用组I自剪接内含子与其外部辅因子“同位素标记的鸟苷5′-磷酸”(5′-GMP)稳定地产生5′-残基标记的RNA片段。这一关键反应与5′-剩余未标记序列的连接相结合,使我们能够以高产率制备位点特异性标记的RNA分子,并通过15 N NMR光谱证实了其产生。这种位点特异性标记的RNA分子可用于检测分子相互作用,并通过核磁共振光谱法以及可能的拉曼光谱法和质谱法来探测催化/结构重要残基的化学特征。
A site-specific isotope labeling technique of long RNA molecules was established. This technique is comprised of two simple enzymatic reactions, namely a guanosine transfer reaction of group I self-splicing introns and a ligation with T4 DNA ligase. The trans-acting group I self-splicing intron with its external cofactor, ‘isotopically labeled guanosine 5′-monophosphate’ (5′-GMP), steadily gave a 5′-residue-labeled RNA fragment. This key reaction, in combination with a ligation of 5′-remainder non-labeled sequence, allowed us to prepare a site-specifically labeled RNA molecule in a high yield, and its production was confirmed with 15N NMR spectroscopy. Such a site-specifically labeled RNA molecule can be used to detect a molecular interaction and to probe chemical features of catalytically/structurally important residues with NMR spectroscopy and possibly Raman spectroscopy and mass spectrometry.
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