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首页> 外文期刊>International Journal of Biological Macromolecules: Structure, Function and Interactions >Orientation of silk III at the air-water interface
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Orientation of silk III at the air-water interface

机译：丝绸III在空气-水界面处的取向

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摘要

A threefold helical crystal structure of Bombyx mori silk fibroin has been observed in films prepared from aqueous silk fibroin solutions using the Langmuir-Blodgett (LB) technique. The films were studied using a combination of transmission electron microscopy and electron diffraction techniques. Films prepared at a surface pressure of 16.7 mN/m have a uniaxially oriented crystalline texture, with the helical axis oriented perpendicular to the plane of the LB film. Films obtained from the air-water interface without compression have a different orientation, with the helical axes lying roughly in the plane of the film. In both cases the d-spacings observed in electron diffraction are the same and match a threefold helical model crystal structure, silk III, described in previous publications. Differences in the relative intensities of the observed reflections in both types of oriented samples, as compared to unoriented samples, allows estimations of orientation distributions and the calculations of orientation parameters. The orientation of the fibroin chain axis in the plane of the interfacial film for uncompressed samples is consistent with the amphiphilic behavior previously postulated to drive the formation of the threefold helical silk III conformation.
机译：在使用Langmuir-Blodgett（LB）技术从水性丝素蛋白水溶液制备的薄膜中，已观察到家蚕丝素蛋白的三重螺旋晶体结构。结合透射电子显微镜和电子衍射技术研究了这些膜。以16.7 mN / m的表面压力制备的薄膜具有单轴取向的晶体织构，其螺旋轴垂直于LB薄膜的平面取向。从空气-水界面未经压缩获得的薄膜具有不同的方向，其螺旋轴大致位于薄膜平面内。在两种情况下，在电子衍射中观察到的d间隔都相同，并且与先前出版物中描述的三重螺旋模型晶体结构Silk III相匹配。与未取向样品相比，在两种取向样品中观察到的反射的相对强度的差异允许取向分布的估计和取向参数的计算。对于未压缩的样品，纤维蛋白链轴在界面膜平面中的取向与先前假设的两亲行为一致，该两亲行为被假定为驱动三重螺旋丝III构象的形成。

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