A dihedral angle‐vicinal proton coupling constant correlation for the α–β bond of amino acid residues

A dihedral angle‐vicinal proton coupling constant correlation for the α–β bond of amino acid residues
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氨基酸残基α-β键的二面角邻位质子耦合常数相关性

DOI:
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发表时间:
1973
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影响因子:
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通讯作者:
Ralph Tauke
Ralph Tauke
中科院分区:
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文献类型:
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作者:
K. Kopple;G. R. Wiley;Ralph Tauke

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从一组覆盖了整个二面角范围的模型化合物中,推导出了肽中氨基酸残基H - c - α - c - β - H体系的耦合常数-二面角相关性。得到的J = 11.0 cos2 θ−1.4 cos θ + 1.6 sin2θ的表达式与目前用于多肽构象的pmr研究接近,为多肽构象的研究提供了更坚实的基础。说明了限制这种和其他“Karplus关系”精度的一个因素。
A coupling constant‐dihedral angle correlation for the HCαCβH system of amino acid residues in peptides has been derived from a set of model compounds covering the full range of dihedral angles. The expression obtained, J = 11.0 cos2 θ −1.4 cos θ + 1.6 sin2θ, is close to those already used in pmr studies of peptide conformation, and provides a firmer foundation for them. A factor limiting the precision of this and other “Karplus relations” is illustrated.