芳香族侧链自旋的分配及其在快速MAS下距离限制的表征

IF 3.5 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Journal of Structural Biology: X Pub Date : 2023-01-01 DOI:10.1016/j.yjsbx.2022.100082
Sahil Ahlawat, Subbarao Mohana Venkata Mopidevi, Pravin P. Taware, Sreejith Raran-Kurussi, Kaustubh R. Mote, Vipin Agarwal
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引用次数: 2

摘要

芳香侧链自旋的指派一直比指派主链和脂肪族自旋更具挑战性。选择性标记与诱变相结合已成为确定芳香自旋的方法。本文报道了一种通过使用低功率TOBSY序列将芳香自旋连接到主链原子上,在完全质子化的蛋白质中分配芳香自旋的方法。脉冲序列采用剩余极化和顺序采集技术,记录了HN-和hc检测光谱在一个单一的实验。芳香族自旋的明确分配也使得表征涉及芳香族自旋的1H-1H距离约束。利用宽带(RFDR)和选择性(BASS-SD)重偶联序列生成了涉及芳香残基侧链质子自旋的HN-ΗC、HC-HN和HC-HC约束。这种方法已经在95-100 kHz MAS的全质子化U-[13C,15N]标记的GB1样品上得到了验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Assignment of aromatic side-chain spins and characterization of their distance restraints at fast MAS

The assignment of aromatic side-chain spins has always been more challenging than assigning backbone and aliphatic spins. Selective labeling combined with mutagenesis has been the approach for assigning aromatic spins. This manuscript reports a method for assigning aromatic spins in a fully protonated protein by connecting them to the backbone atoms using a low-power TOBSY sequence. The pulse sequence employs residual polarization and sequential acquisitions techniques to record HN- and HC-detected spectra in a single experiment. The unambiguous assignment of aromatic spins also enables the characterization of 1H–1H distance restraints involving aromatic spins. Broadband (RFDR) and selective (BASS-SD) recoupling sequences were used to generate HNC, HC-HN and HC-HC restraints involving the side-chain proton spins of aromatic residues. This approach has been demonstrated on a fully protonated U-[13C,15N] labeled GB1 sample at 95–100 kHz MAS.

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来源期刊
Journal of Structural Biology: X
Journal of Structural Biology: X Biochemistry, Genetics and Molecular Biology-Structural Biology
CiteScore
6.50
自引率
0.00%
发文量
20
审稿时长
62 days
期刊最新文献
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