χ1 angle information from a simple two-dimensional NMR experiment that identifies trans 3JNCγ couplings in isotopically enriched proteins

χ1 angle information from a simple two-dimensional NMR experiment that identifies trans 3JNCγ couplings in isotopically enriched proteins
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来自简单二维 NMR 实验的 χ 角信息,该实验可识别同位素富集蛋白质中的反式 3JNCγ 偶联

DOI:
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发表时间:
1997
期刊:
影响因子:
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通讯作者:
A. Bax
A. Bax
中科院分区:
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文献类型:
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作者:
J. Hu;A. Bax

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新的定量J相关实验用于测量均匀富集13c和15N的蛋白质中15N与脂肪侧链碳之间的所有二键和三键偶联。结果表明,3jnc - β和2jnc - β均非常小。因此,一个简单且相对敏感的二维自旋回波差异实验可以用来识别3jnc - γ耦合明显大于1Hz的残基,表明N和c - γ之间存在反排。因此,该测量为含有脂肪族Cγ碳的残基提供了χ1角信息,从而也有助于对Hβ共振进行立体定向分配。实验证明了泛素和钙调素与26残基肽之间的复合物。
New quantitative J correlation experiments are used for measuring all two- and three-bondcouplings between 15N and aliphatic side-chain carbons in proteins uniformly enriched in 13Cand 15N. Results show that 3JNCβ and 2JNCβ invariably are very small.Therefore, a simple and relatively sensitive two-dimensional spin-echo difference experimentcan be used to identify residues with a 3JNCγ coupling substantially larger than 1Hz, indicative of a trans arrangement between N and Cγ. This measurement thereforeprovides χ1 angle information for residues with an aliphatic Cγ carbon, andthereby also aids in making stereospecific assignments of Hβ resonances. Experimentsare demonstrated for ubiquitin and for a complex between calmodulin and a 26-residuepeptide.
通过随机分数标记蛋白质的 13C 弛豫研究揭示了人类泛素的内部动力学。
DOI: 10.1021/bi9530144
发表时间: 1996
期刊: Biochemistry.
影响因子: --
作者:
Wand,AJ;Urbauer,JL;McEvoy,RP;Bieber,RJ
通讯作者: Bieber,RJ