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Structure of O-Polysaccharide and Lipid A of Pantoea Agglomerans 8488

机译:泛珠菌8488的O-多糖和脂质A的结构

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摘要

The 8488 lipopolysaccharide (LPS) was isolated, purified and characterized by monosaccharide and fatty acid analysis. The O-polysaccharide and lipid A components of the LPS were separated by mild acid degradation. Lipid A was studied by electrospray ionization mass spectrometry (ESI-MS) and found to consist of hexa-, penta-, tetra- and tri-acylated species. Two-dimensional nuclear magnetic resonance (NMR) spectroscopy revealed the following structure of the O-polysaccharide repeating unit →3)-α-L-Rha -(1→6)-α-D-Man -(1→3)-α-L-Fuc -(1→3)-β-D-GlcNAc -(1→. The LPS showed a low level of toxicity, was not pyrogenic, and reduced the adhesiveness index of microorganisms to 2.12, which was twofold less than the control. LPS modified by complex compounds of germanium (IV) and tin (IV) were obtained. It was found that six LPS samples modified by Sn compounds and two LPS samples modified by Ge compounds lost their toxic activity when administered to mice in a dose of LD (105 µg/mice or 5 mg/kg). However, none of the modified LPS samples changed their serological activity in an Ouchterlony double immunodiffusion test in agar.
机译:分离,纯化和纯化8488脂多糖(LPS),并进行单糖和脂肪酸分析。 LPS的O多糖和脂质A成分通过轻度酸降解而分离。脂质A通过电喷雾电离质谱(ESI-MS)进行了研究,发现它由六,五,四和三酰化物质组成。二维核磁共振(NMR)光谱显示了O-多糖重复单元→3)-α-L-Rha-(1→6)-α-D-Man-(1→3)-α的以下结构-L-Fuc-(1→3)-β-D-GlcNAc-(1→。)LPS毒性低,不致热,将微生物的黏附指数降低至2.12,是其LPS的两倍。对照得到了由锗(IV)和锡(IV)的复合化合物修饰的脂多糖,发现当以一定剂量向小鼠给药时,六个被锡化合物修饰的脂多糖和两个被锗化合物修饰的脂多糖都失去了毒性。 LD(105 µg /小鼠或5 mg / kg),但是在琼脂中的Ouchterlony双重免疫扩散试验中,没有修饰过的LPS样品改变其血清学活性。

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