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穿越脯氨酸困境的桥梁:使用 (HCA)CON(CAN)H 和 (HCA)N(CA)CO(N)H 实验与 HNCO 和 i(HCA)CO(CA)NH 同时进行的无规卷曲蛋白质的分配。

Bridge over troubled proline: assignment of intrinsically disordered proteins using (HCA)CON(CAN)H and (HCA)N(CA)CO(N)H experiments concomitantly with HNCO and i(HCA)CO(CA)NH.

机构信息

Program in Structural Biology and Biophysics, Institute of Biotechnology/NMR Laboratory, University of Helsinki, P.O. Box 65, 00014, Helsinki, Finland.

出版信息

J Biomol NMR. 2014 Jan;58(1):49-60. doi: 10.1007/s10858-013-9804-0. Epub 2013 Dec 18.

Abstract

NMR spectroscopy is by far the most versatile and information rich technique to study intrinsically disordered proteins (IDPs). While NMR is able to offer residue level information on structure and dynamics, assignment of chemical shift resonances in IDPs is not a straightforward process. Consequently, numerous pulse sequences and assignment protocols have been developed during past several years, targeted especially for the assignment of IDPs, including experiments that employ H(N), H(α) or (13)C detection combined with two to six indirectly detected dimensions. Here we propose two new HN-detection based pulse sequences, (HCA)CON(CAN)H and (HCA)N(CA)CO(N)H, that provide correlations with (1)H(N)(i - 1), (13)C'(i - 1) and (15)N(i), and (1)H(N)(i + 1), (13)C'(i) and (15)N(i) frequencies, respectively. Most importantly, they offer sequential links across the proline bridges and enable filling the single proline gaps during the assignment. We show that the novel experiments can efficiently complement the information available from existing HNCO and intraresidual i(HCA)CO(CA)NH pulse sequences and their concomitant usage enabled >95 % assignment of backbone resonances in cytoplasmic tail of adenosine receptor A2A in comparison to 73 % complete assignment using the HNCO/i(HCA)CO(CA)NH data alone.

摘要

NMR 光谱学是迄今为止研究无规卷曲蛋白质 (IDP) 最通用和信息最丰富的技术。虽然 NMR 能够提供有关结构和动力学的残基水平信息,但在 IDP 中分配化学位移共振并不是一个直接的过程。因此,在过去几年中,已经开发了许多脉冲序列和分配协议,专门针对 IDP 的分配,包括使用 H(N)、H(α)或 (13)C 检测并结合两个到六个间接检测维度的实验。在这里,我们提出了两种新的基于 HN 检测的脉冲序列 (HCA)CON(CAN)H 和 (HCA)N(CA)CO(N)H,它们分别提供与 (1)H(N)(i - 1)、(13)C'(i - 1)和 (15)N(i)以及 (1)H(N)(i + 1)、(13)C'(i)和 (15)N(i)频率的相关信息。最重要的是,它们提供了跨越脯氨酸桥的顺序链接,并能够在分配过程中填充单个脯氨酸间隙。我们表明,新的实验可以有效地补充现有的 HNCO 和 intraresidual i(HCA)CO(CA)NH 脉冲序列提供的信息,并且它们的同时使用使腺苷受体 A2A 细胞质尾巴的骨架共振的分配率达到了 >95%,而单独使用 HNCO/i(HCA)CO(CA)NH 数据仅达到了 73%的完整分配。

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