耐青霉素肺炎链球菌的蛋白质组学研究

目的：观察耐青霉素肺炎链球菌异常蛋白表达，探讨其蛋白组学差异与耐青霉素的关系。方法采用次抑菌浓度法将肺炎链球菌国际标准菌株诱导为耐青霉素肺炎链球菌株；双向电泳分离肺炎链球菌标准株和诱导耐药株的全菌蛋白质；Image Master 2D Platinum 5.0软件对电泳图谱进行分析，寻找表达差异蛋白点；对差异蛋白点进行质谱分析。结果成功诱导耐青霉素肺炎链球菌，并建立肺炎链球菌标准株和耐药株的全菌蛋白双向电泳图谱。标准株和耐药株分别分离出约320，350个蛋白点，发现10个差异蛋白。与标准株比较，ABC转运器、触发因子、DNA聚合酶Ⅲ、氨基酸ABC转运和SP表面蛋白A表达量上调，分子伴侣、脂蛋白、果糖二磷酸醛缩酶、α-烯醇化酶和假想蛋白表达量下调。结论耐青霉素肺炎链球菌蛋白表达异常导致的蛋白组学改变可为深入探讨其耐药机制提供新的研究方向。

Proteomic analysis of penicillin-resistant streptococcus pneumoniae strain

Objective To analyze the proteomics of penicil in- resistant streptococcus pneumonia （PRSP）. Methods The penicil in- resistant streptococcus pneumonia strain was induced by sub- MIC method. The protein profile of Streptococcus pneumoniae and induced PRSP were examined by two- dimensional electrophoresis;and the electrophoretic patterns were ana-lyzed by using Image Master 2D Platinum 5.0. The differential y expressed proteins were further identified by mass spectrometry. Results PRSP strains were induce successful y. Ten differential y expressed proteins were identified between Streptococcus pneumoniae and induced PRSP. The expression of ABC transporter, trigger factor, DNA Polymerase III, amino acid transport, pneumococcal surface protein A was increase in PRSP;while the expression of chaperonin GroES, lipoprotein, fructose bisphos-phate aldolase,α- enolase decreases, hypothetical protein SpneT_02001699 was decreased. Conclusion The findings of pro-teomics change in penicil in- resistant streptococcus pneumoniae may provide laboratory evidence for further study of drug re-sistance mechanisms.