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首页> 外文期刊>Solid State Nuclear Magnetic Resonance >15N and 1H R relaxation dispersion: Application to wild-type and G53A ubiquitin crystals]]>
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15N and 1H R relaxation dispersion: Application to wild-type and G53A ubiquitin crystals]]>

机译:<![CDATA [CDATA [CDATA [CE:SUP =“POST”> 15 N和 1 HR 弛豫分散:应用于野生型和G53A泛素晶体]]]>

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摘要

AbstractSolid-state NMR spectroscopy can provide site-resolved information about protein dynamics over many time scales. Here we combine protein deuteration, fast magic-angle spinning (~45–60kHz) and proton detection to study dynamics of ubiquitin in microcrystals, and in particular a mutant in a region that undergoes microsecond motions in a β-turn region in the wild-type protein. We use15N Rrelaxation measurements as a function of the radio-frequency (RF) field strength, i.e. relaxation dispersion, to probe how the G53A mutation alters these dynamics. We report a population-inversion of conformational states: the conformation that in the wild-type protein is populated only sparsely becomes the predominant state. We furthermore explore the potential to use amide-1H Rrelaxation to obtain insight into dynamics. We show that while quantitative interpretation of1H relaxation remains beyond reach under the experimental conditions, due to coherent contributions to decay, one may extract qualitative information about flexibility.Highlights?The microsecond dynamics of a mutant of ubiquitin in crystalline form is investigated through solid-state NMR.?The Gly-to-Ala substitution inverts the population levels of type-I and type-II β-turn conformations.?15N Rrelaxation dispersion provides evidence for a conformational dynamics on a ca. 100μs time scale.?We further investigate the potential of1H Rrelaxation dispersion experiments to probe molecular dynamics in solid samples.?1H R1ρ relaxation data are able to qualitatively detect microsecond motions.]]>
机译:<![cdata [ 抽象 固态NMR光谱可以在许多时间尺度上提供有关蛋白质动态的站点解决的信息。在这里,我们将蛋白质氘化,快速魔法角旋转(〜45-60kHz)和质子检测结合起来,以研究微晶中泛素的动态,特别是在野外β-转弯区域中经历微秒动运动的区域中的突变体。蛋白质。我们使用 15 nr 放松测量作为射频(rf)的函数场强,即松弛分散,探测G53A突变如何改变这些动态。我们报告了构象状态的人口反转:填充野生型蛋白质的构象仅稀疏地成为主要状态。我们还探讨了使用amide的潜力 - 1 hr 放松,以获得洞察力的洞察力。我们展示了对 1 h弛豫的定量解释在实验条件下,由于衰变的连贯贡献,可以提取有关灵活性的定性信息。< / ce:简单 - 段> 亮点 研究了泛素突变突变体以结晶形式的微秒动态通过固态NMR。 Gly-to-Ala替换反转I型和II型β-Turn Conformatio的人口水平ns。 15 nr 放松分散为a上的构象动态提供了证据加利福尼亚州。 100μs时间尺度。 我们进一步调查 1 hr 弛豫分散探测固体样品中分子动力学的实验。 1 hr1ρ松弛数据能够定性地检测微秒的运动。 ]]>

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