Objective To explore the potential pathogenesis of Yersinia pestis and provide new clues for vaccine development through comparative proteomic analysis of wild-type and pCD1 cured strain of Yersinia pestis 201.Methods Differentially expressed proteins at 26℃ and 37℃ were separated and identified using two-dimensional electrophoresis coupled with mass spectrometry .Results A total of 24 differently expressed proteins were successfully identified from the samples of bacteria grown at 26℃ and 25 proteins at 37℃.Among these, 7 proteins were encoded by pCD 1 plasmid. Conclusion Through comparative proteomic research, we have found that the abundance of several proteins can be dramatically changed when the large plasmid pCD 1 is missing,suggesting that the plasmid can regulate the expression of many genes located in the chromosome .%目的：分析缺失编码Ⅲ型分泌系统的大质粒pCD1对鼠疫耶尔森菌蛋白质表达谱的影响，探索鼠疫菌的潜在致病机制，为鼠疫疫苗研制提供新线索。方法通过双向电泳与质谱分析相结合的方法，比较鼠疫菌在26℃和37℃不同培养温度下，全菌蛋白表达谱差异，鉴定差异蛋白并对其功能进行初步分析。结果成功分离并鉴定了鼠疫菌201株和201△pCD1缺失突变株中的差异蛋白，其中26℃条件下鉴定到24个差异蛋白，37℃条件下鉴定到25个差异蛋白，内含7个由pCD1质粒编码的蛋白。结论通过比较蛋白质组学研究，发现大质粒pCD1缺失后，多种染色体编码蛋白的丰度发生了显著变化，暗示大质粒能调控染色体编码基因的表达。
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