首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Isotope-detected 1H NMR studies of proteins: a general strategy for editing interproton nuclear Overhauser effects by heteronuclear decoupling with application to phage lambda repressor.
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Isotope-detected 1H NMR studies of proteins: a general strategy for editing interproton nuclear Overhauser effects by heteronuclear decoupling with application to phage lambda repressor.

机译:同位素检测的1H NMR蛋白质研究:通过异核去耦编辑质子间核Overhauser效应的一般策略并应用于噬菌体λ阻遏物。

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摘要

A strategy for editing interproton nuclear Overhauser effects (NOEs) in proteins is proposed and illustrated. Selective incorporation of 13C- (or 15N)-labeled amino acids into a protein permits NOEs involving the labeled residues to be identified by heteronuclear difference decoupling. Such heteronuclear editing simplifies the NOE difference spectrum and avoids ambiguities due to spin diffusion. Isotope-detected 1H NMR thus opens to study proteins too large for conventional one- and two-dimensional NMR methods (20-75 kDa). We have applied this strategy to the N-terminal domain of phage lambda repressor, a protein of dimer molecular mass 23 kDa. A tertiary NOE from an internal aromatic ring (Phe-51) to a beta-13C-labeled alanine residue (Ala-62) is demonstrated.
机译:提出并举例说明了编辑蛋白质中质子间核过度劳累效应(NOE)的策略。将13 C-(或15 N)标记的氨基酸选择性地掺入蛋白质中,可以通过异核差异解偶联来鉴定涉及标记残基的NOE。这种异核编辑简化了NOE差异谱,并避免了由于自旋扩散引起的歧义。因此,同位素检测的1H NMR可以用于研究对于常规一维和二维NMR方法(20-75 kDa)而言太大的蛋白质。我们已经将该策略应用于噬菌体λ阻遏物的N末端结构域,该蛋白是二聚体分子量为23 kDa的蛋白质。证明了从内部芳环(Phe-51)到β-13C标记的丙氨酸残基(Ala-62)的叔NOE。

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