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Pulsed-field gradient-based water suppression techniques in homonuclear NMR spectroscopy

机译:同核NMR光谱中的脉冲场梯度基水抑制技术

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Suppression of the immense water signal arising in studies of proteins and nucleic acids in aqueous solution has traditionally been a formidable problem in biomolecular nuclear magnetic resonance (NMR). Conventionally used presaturation-based techniques result in significant attenuation of exchangeable protons such as amides in proteins and imino/amino protons in nucleic acids. Spectra also suffer from artifacts such as baseline distortions. With the advent of pulsed field gradients (PFGs), high degree of suppression of water signal can be achieved with complete preservation of exchangeable protons, We present two PFG- and selective-excitation-based techniques: gradient-flipback (GRAF) and watergated-gradient-flipback (WGRAF), which complement existing PFG-based methods and improve upon some of their shortcomings, The GRAF technique provides high selectivity near the mater resonance whereas WGRAF compromises on selectivity to deliver ultra-high quality suppression of water signal. Application of these techniques to NOESY and TOCSY spectra of barstar are demonstrated. [References: 22]
机译:传统上是生物分子核磁共振(NMR)中的蛋白质和核酸研究中产生的巨态水信号的抑制。通常使用的基于最大的技术导致可交换质子的显着衰减,例如核酸中蛋白质中的蛋白质和氨基/氨基质子的酰胺。光谱也遭受诸如基线扭曲的伪影。随着脉冲场梯度的出现(PFGS),可以通过完全保存可更换质子的完全保存来实现高度抑制水信号,我们呈现了两种基于PFG和选择性激励的技术:梯度 - 翻转(GRAF)和防水 - GRAF技术补充了现有的基于PFG的方法和改进了基于PFG的方法的梯度 - 翻转(WGRAF),提供了靠近Mater共振的高选择性,而WGRAF妥协选择性以提供超高质量的水信号。对这些技术的应用与嘈杂的Barstar的Noesy和Tocsy光谱进行说明。 [参考:22]

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