中文摘要：

选择agrI型金黄色葡萄球菌ATCC6538组氨酸蛋白激酶AgrC蛋白六个跨膜区中与跨膜信号转导过程最密切的一条肽链为受体,将此多肽采用超声法镶嵌到人工细胞膜上,采用透射电镜和原子力显微镜对其形态进行了分析,发现大部分囊泡及镶嵌体系的单个形态为均一球状,直径大小在50～200nm范围内.考察悬浮液pH、体系温度及浓度等因素对其稳定性的影响,发现在pH为7.0,温度不超过30℃,多肽和N^＋C5Ala2C16的物质的量之比为1∶100时,镶嵌体系的稳定性最强.同时,通过圆二色谱、差示扫描量热分析等手段对镶嵌模型进行表征,分析发现多肽分子能稳定地插入双层膜囊泡中,且能主动地插入形成镶嵌体系.

英文摘要：

One of the six transmembrane domains of AgrC from Staphylococcus aureus ATCC 6538 （agr I type） which is closest with the process of transmembrane signal transduction in quorum sensing was selected as a receptor. This polypeptide was inserted into the artificial cell membrane by ultrasonic procedure, and the pattern of the vesicles was analyzed by transmission electron microscopy （TEM） and atomic force microscopy （AFM）. It was found that the single shape of most vesicles （blank and embedded with peptide） was uniform sphere, and the diameter size is from 50 to 200 nm. Considering the impact of suspension pH, concentration and temperature factors to the stability of the embeded system, it is found that the system was the most stable under the following conditions： pH 7.0, temperature lower than 30 ℃, mole ratio of the polypeptide and N^＋C5Ala2C16 being 1∶100. Meanwhile, it is also discovered that polypeptide was capable of inserting into bilayer vesicles stably and positively to form embeded system by circular dichroism spectra and differential scanning calorimetry.