金黄色葡萄球菌B型肠毒素的构象研究

Conformation Study of Staphylococcal Enterotoxin B

摘要:

采用扫描电镜、X－射线衍射仪、原子力显微镜、傅立叶红外光谱仪等现代结构分析手段，对金黄色葡萄球菌B型肠毒素的蛋白质聚集态结构、立体形貌、分子链构象等进行较为系统的结构表征。结果表明：SEB结构中有结晶区的形成，结晶度为37.8%，SEB分子聚集在一起，形态主要为片状和平板状，具有一定的规整性；SEB在稀溶液状态下其单分子链长度约为1500 nm，分子链宽度约为20~40 nm，分子链高0.6 nm；SEB是一种β－折叠结构含量较多的蛋白质。

Abstract:

The aggregation structure, the molecule chain morphology and secondary structural parameters of SEB were investigated with modern structural analyzing techniques, such as X-ray diffraction, scan electron microscopy, atomic force microscopy and fourier transform infrared spectrum. Crystallization was found in SEB with the crystallinity of 37.8%. The conformation of the conglomerated SEB molecules was sheet and plate. In dilute solution, the length, width and height of the SEB molecular chain were 1500 nm, 20~40 nm and 0.6 nm, respectively. It was also found that the secondary structure of SEB was mainly of β-sheets.