波谱学杂志 ›› 2019, Vol. 36 ›› Issue (1): 1-14.doi: 10.11938/cjmr20182637

• 研究论文 • 上一篇    下一篇

拟南芥AtGrp7 RRM结构域的纯化及其结构与结合的初步分析(英文)

迟秀娟1,2, 乔晓亚2, 刘颖3, 刘惠丽4, 陈雷4, 王际辉1, 艾选军2   

  1. 1. 大连工业大学 生物工程学院, 辽宁 大连 116034;
    2. 洁净能源国家实验室(中国科学院 大连化学物理研究所), 辽宁 大连 116023;
    3. 国家艾滋病性病防治中心, 病毒与免疫研究室, 北京 102206;
    4. 波谱与原子分子物理国家重点实验室, 武汉磁共振中心(中国科学院 武汉物理与数学研究所), 湖北 武汉 430071
  • 收稿日期:2018-04-19 出版日期:2019-03-05 发布日期:2018-04-24
  • 通讯作者: 王际辉,Tel:0411-86324050,E-mail:wangjh@dlpu.edu.cn;艾选军,Tel:0411-82463016,E-mail:xai@dicp.ac.cn E-mail:wangjh@dlpu.edu.cn;xai@dicp.ac.cn
  • 基金资助:
    The Liaoning Natural Science Foundation (20170520198, 20170520043); Project Supported by the State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics (T151601).

Purification of the AtGrp7 RRM Domain from Arabidopsis thaliana and Its Preliminary Structure and Binding Analysis

CHI Xiu-juan1,2, QIAO Xiao-ya2, LIU Ying3, LIU Hui-li4, CHEN Lei4, WANG Ji-hui1, AI Xuan-jun2   

  1. 1. School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China;
    2. National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
    3. Division of Virology & Immunology, National Center for AIDS/STD Control and Prevention, Beijing 102206, China;
    4. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan(Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China
  • Received:2018-04-19 Online:2019-03-05 Published:2018-04-24
  • Supported by:
    The Liaoning Natural Science Foundation (20170520198, 20170520043); Project Supported by the State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics (T151601).

摘要: 富含甘氨酸的RNA结合蛋白AtGrp7是拟南芥(Arabidopsis thaliana)调节生物钟负反馈回路的组分.在使用常规方法纯化AtGrp7 RRM结构域的初始试验中,观察到烟草蚀纹病毒(TEV)酶切后AtGrp7 RNA识别基序(RRM)结构域的紫外吸收峰为蛋白和杂质的混合信号峰.为解决常规纯化中的杂质问题,对AtGrp71-90应用了变性-复性两步纯化方法.AtGrp7 RRM结构域的1H-15N HSQC指纹谱和CS-Rosetta模型结构表明快速稀释重折叠后其结构完全恢复.等温滴定量热法(ITC)和核磁共振(NMR)滴定实验进一步证实,重折叠后AtGrp71-90 RRM结构域具有正确结合RNA/DNA的功能.

关键词: 变性-复性, 快速稀释, 核磁共振(NMR), AtGrp7 RNA识别基序(RRM)结构域, 结合分析

Abstract: The glycine-rich RNA-binding protein, AtGrp7, is a component of a negative feedback loop in the circadian clock regulation of Arabidopsis thaliana. In our initial purification trial of the tobacco etch virus (TEV)-cleaved AtGrp7 RNA recognition motif (RRM) domain with the regular protocol, mixed ultraviolet signals of the target proteins and contaminants were observed. A two-step denaturing-refolding protocol was then tested, trying to solve the problem of impurities. The structure of the AtGrp71-90 RRM domain was fully recovered by quick-dilution refolding, evidenced by the fingerprint 1H-15N HSQC spectrum and CS-Rosetta model structures. Isothermal titration calorimetry (ITC) and NMR titration experiments further confirmed that the RRM domain of AtGrp71-90 had proper functions with regards to RNA/DNA binding.

Key words: denaturing-refolding, quick-dilution, nuclear magnetic resonance (NMR), AtGrp7 RNA recognition motif (RRM)domain, binding analysis

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