红球菌跨膜运输荧蒽的差异膜蛋白分析

提取不同时间荧蒽诱导下红球菌BAP-1分泌的膜蛋白，利用同位素标记相对和绝对定量技术（iTRAQ技术）结合液相二级质谱对差异膜蛋白进行聚类以及生物信息学分析.旨在从蛋白质层面上研究红球菌BAP-1跨膜运输荧蒽过程中起关键作用的膜蛋白种类及其作用机制.结果共鉴定到172个差异膜蛋白.通过差异膜蛋白的COG和GO功能分析，发现荧蒽的加入主要影响了红球菌BAP-1细胞膜上与能量、转运相关的膜蛋白.ABC转运蛋白和TonB依赖转运蛋白作为微生物主要的载体蛋白对BAP-1跨膜运输荧蒽起到了重要作用.过氧化氢酶和超氧化物歧化酶在第6d有一个显著上调，作为抗氧化防御机制来保护微生物.各种膜蛋白在不同阶段发挥着各自作用，这些蛋白共同组成蛋白互作网络调控红球菌BAP-1的跨膜运输过程.

Differential membrane protein analysis of Rhodococcus during the transmembrane-transport process of fluoranthene

Comparative proteomics analysis was performed on membrane proteins extracted from Rhodococcus sp. BAP-1on consecutive fluoranthene exposure days by using isobaric tags for relative and absolute quantization (iTRAQ) labelling and LC-MS/MS analysis to access differentially expressed membrane proteins. A total of 172differential membrane proteins were identified. The enrichment of COG and GO terms analysis of differentially expressed membrane proteins in three clusters showed that most of the differential proteins were involved in transport and oxidation-reduction processes. ABC transporters and TonB-dependent receptors played an important role in transmembrane-transport of fluoranthene. Catalase and superoxide dismutase had a significant up-regulation in sixth days as an antioxidant defence mechanism to protect microbes. Various energy-produced proteins played their respective roles at different stages, and constituted a protein interaction network to regulate transmembrane-transport of microorganisms.