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Determining the helical tilt of membrane peptides using electron paramagnetic resonance spectroscopy

机译:使用电子顺磁共振光谱法测定膜肽的螺旋倾斜

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摘要

Theoretical calculations of hyperfine splitting values derived from the EPR spectra of TOAC spin-labeled rigid aligned alpha-helical membrane peptides reveal a unique periodic variation. In the absence of helical motion, a plot of the corresponding hyperfine splitting values as a function of residue number results in a sinusoidal curve that depends on the helical tilt angle that the peptide makes with respect to the magnetic field. Motion about the long helical axis reduces the amplitude of the curve and averages out the corresponding hyperfine splitting values. The corresponding spectra can be used to determine the director axis tilt angle from the TOAC spin label, which can be used to calculate the helical tilt angle due to the rigidity of the TOAC spin label. Additionally, this paper describes a method to experimentally determine this helical tilt angle from the hyperfine splitting values of three consecutive residues. Published by Elsevier Inc.
机译:从TOAC自旋标记的刚性排列的α螺旋膜肽的EPR谱得出的超精细分裂值的理论计算显示出独特的周期性变化。在没有螺旋运动的情况下,相应的超精细分裂值作为残基数的函数的图将产生正弦曲线,该曲线取决于肽相对于磁场的螺旋倾斜角。围绕长螺旋轴的运动会减小曲线的幅度,并平均出相应的超精细劈裂值。相应的光谱可用于从TOAC旋转标签确定指向矢轴倾斜角,由于TOAC旋转标签的刚度可用于计算螺旋倾斜角。此外,本文介绍了一种从三个连续残基的超精细劈裂值实验确定此螺旋倾斜角的方法。由Elsevier Inc.发布

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