Reconstitution of Isotopically Labeled Ribosomal Protein L29 in the 50S Large Ribosomal Subunit for Solution-State and Solid-State NMR.

Reconstitution of Isotopically Labeled Ribosomal Protein L29 in the 50S Large Ribosomal Subunit for Solution-State and Solid-State NMR.
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重建 50S 大核糖体亚基中同位素标记的核糖体蛋白 L29,用于溶液态和固态 NMR

DOI:
10.1007/978-1-4939-7759-8_6
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发表时间:
2018
影响因子:
--
通讯作者:
Beckmann
Beckmann
中科院分区:
--
文献类型:
--
作者:
Barbet-Massin;van der Sluis;Musial;Beckmann

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固体核磁共振(NMR)是近年来在原子分辨率上研究大型生物分子复合物结构和动力学特性的一种方法。事实上,最近的技术和方法的发展已经使研究更加复杂的固态系统成为可能。然而,要通过核磁共振探索多组分蛋白质复合物,需要开发特定的标记方案,这取决于要回答的生物学问题。我们在这里展示了如何在未标记的50S或70S核糖体亚基中重建同位素标记的蛋白质。我们特别关注了63个残基的核糖体蛋白L29 (~7 kDa),它位于大的50S核糖体亚基(~1.5 MDa)隧道的出口。这项工作的目的是制备合适的样品来研究由新生多肽链诱导的核糖体蛋白的变构构象变化,并触发与不同伴侣的相互作用(例如,触发因子或SRP)。
Solid-state nuclear magnetic resonance (NMR) has recently emerged as a method of choice to study structural and dynamic properties of large biomolecular complexes at atomic resolution. Indeed, recent technological and methodological developments have enabled the study of ever more complex systems in the solid-state. However, to explore multicomponent protein complexes by NMR, specific labeling schemes need to be developed that are dependent on the biological question to be answered. We show here how to reconstitute an isotopically labeled protein within the unlabeled 50S or 70S ribosomal subunit. In particular, we focus on the 63-residue ribosomal protein L29 (~7 kDa), which is located at the exit of the tunnel of the large 50S ribosomal subunit (~1.5 MDa). The aim of this work is the preparation of a suitable sample to investigate allosteric conformational changes in a ribosomal protein that are induced by the nascent polypeptide chain and that trigger the interaction with different chaperones (e.g., trigger factor or SRP).
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