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HELIX PROPENSITIES OF BASIC AMINO ACIDS INCREASE WITH THE LENGTH OF THE SIDE-CHAIN

机译:碱性氨基酸的螺旋性质随链长的增加而增加

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Helix formation in a 17-residue alanine-lysine peptide and analogous peptides with specific lysine --> X substitutions, where X is 2,3-diamino-L-propionic acid, 2,4-diamino-L-butyric acid or L-ornithine, have been examined using circular dichroism measurements. The dependence of helix content on X, its position in the sequence, and the number of lysine --> X substitutions are reasonably well described by using the Lifson-Roig theory modified to include N-capping, without explicitly considering charge-helix dipole interactions. The helix propensities for these basic amino acids increase with the length of the side-chain in the rank order 2,3-diamino-L-propionic acid < 2,4-diamino-L-butyric acid < ornithine < lysine. This parallels the increase in helix propensities with side-chain length of other polar and charged amino acids. (C) 1996 Academic Press Limited [References: 38]
机译:在17个残基的丙氨酸-赖氨酸肽和具有特定赖氨酸-> X取代的类似肽中形成螺旋,其中X是2,3-二氨基-L-丙酸,2,4-二氨基-L-丁酸或L-鸟氨酸,已使用圆二色性测量进行了检查。螺旋线含量对X的依赖性,其在序列中的位置以及赖氨酸-> X取代的数目可以通过使用修饰为包括N封端的Lifson-Roig理论很好地描述,而无需明确考虑电荷-螺旋偶极子相互作用。这些碱性氨基酸的螺旋倾向随着侧链的长度按2,3-二氨基-L-丙酸<2,4-二氨基-L-丁酸<鸟氨酸<赖氨酸的顺序增加。这使螺旋倾向的增加与其他极性和带电荷氨基酸的侧链长度平行。 (C)1996 Academic Press Limited [参考号:38]

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