百日咳毒素(pertussis toxin，PTx)是百日咳鲍特菌产生的重要毒素，是百日咳发病过程中重要的致病因子。研究显示，与PTx互作蛋白的分子量差异较大，从人淋巴细胞表面的43 kD蛋白到胰岛素分泌细胞表面的200 kD蛋白不等。已经明确PTx可与宿主细胞表面的N连接寡糖糖蛋白、唾液酸糖蛋白类因子以及一些糖蛋白(如触珠蛋白和胎球蛋白)、Gn D1a糖脂相互作用，尤其与其受体Gi蛋白互作，致胞内cAMP水平上升，引起各种生理反应。但目前对PTx在胞内的其他修饰底物和互作蛋白认识有限，严重阻碍了对PTx如何调控宿主细胞的其他信号通路和生理功能的深入理解。n “,”Pertussis toxin(PTx), an important toxin that produced by Bordetella pertussis, is an important pathogenic factor in the pathogenesis of whooping cough.The previous studies have showed that PTx interacting proteins vary distinctly in size, ranging from the 43 kD surface protein of human lymphocyte to the 200 kD surface protein of insulin secreting cells.PTx has been shown to interact with N-linked oligosaccharides on the surface of host cells, sialoglycoprotein-like factors, glycoproteins such as haptoglobin, fetuin, Gn D1a glycolipids.Especially, the interaction of PTx with its receptor Gi protein can result in increased intracellular cAMP level, which will lead to multiple physiological responses.However, the current limited understanding of other PTx modified substrates and interacting proteins in cells has seriously hindered our understanding on the mechanism that PTx regulates other signaling pathways and physiological functions of the host.n