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The structure of the α-keratin microfibril

机译:α-角蛋白微纤维的结构

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Quantitative measurements of the intensity of the meridional reflections in the X-ray-diffraction pattern of α-keratin are shown to be consistent with a microfibril structure in which a surface lattice with an axially projected period around 200 ? is subject to a periodic interruption with an axially projected period of 470 ?. Taken in conjunction with recent evidence on the chemical structure of α-keratin and other inter-mediate filaments this finding enables an elaboration to be made of a model proposed earlier by RDB Fraser, TP MacRae, & E Suzuki (3. Mol. Biol. 108, 435–452, 1976.) for the α-helical framework of the microfibrii. The disposition and connectivity of the helical segments suggested here provides a straightforward explanation of a number of recent physicochemical and electron-microscopical observations on intermediate filaments and provides a starting point for the development of models for the framework of other intermediate filaments.
机译:定量测定α-角蛋白的X射线衍射图的子午反射强度与微纤维结构一致,在该微纤维结构中,轴向晶格的表面晶格约为200°。受到周期性中断,轴向投影周期为470?。结合有关α-角蛋白和其他中间丝的化学结构的最新证据,这一发现使得可以对RDB Fraser,TP MacRae和E Suzuki早些时候提出的模型进行阐述(3. Mol。Biol。 108,435–452,1976.)表示微纤维的α螺旋结构。这里建议的螺旋段的布置和连通性提供了对中间丝的许多近期物理化学和电子显微镜观察的直接解释,并为其他中间丝框架的模型开发提供了起点。

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