细菌鞭毛的低角x射线衍射研究

G. Swanbeck, B. Forslind
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引用次数: 14

摘要

为了区分各种提出的细菌鞭毛结构模型,对Proteus vulgaris的湿标本进行了低角度x射线衍射研究。得到了低角赤道衍射图,并与Labaw和Mosley理论计算的棒状结构和双螺旋和三螺旋结构的衍射图进行了比较。比较表明,由螺旋细丝组成的模型是最可能的结构。对实验散射数据进行傅里叶-贝塞尔变换,发现径向密度分布曲线在结构中部呈低值,表明鞭毛具有中空的中心,因此有利于三螺旋形式。
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A low-angle X-ray diffraction study of bacterial flagella

In order to differentiate between the various proposed models for the structure bacterial flagella, low-angle X-ray diffraction studies have been carried out on wet specimens of Proteus vulgaris. The low-angle equatorial diffraction pattern has been obtained and compared with the theoretically calculated patterns for a rod model and the double and triple helical structures according to Labaw and Mosley. The comparison shows that a model comprised of helical filaments is the most likely structure. Fourier-Bessel transformation of the experimental scattering data has been performed and the radial density-distribution curve gives low values in the middle of the structure, suggesting the flagellum has a hollow center, thus favouring the triple helical form.

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