Construction of AgrC Proteoliposomes by Detergent-Mediated Method

doi:10.6023/A13111123

Acta Chimica Sinica ›› 2014, Vol. 72 ›› Issue (2): 233-240.DOI: 10.6023/A13111123 Previous Articles Next Articles

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利用表面活性剂介导的方法制备AgrC蛋白脂质体

王丽娜^a, 权春善^b,c, 许永斌^b,c, 李西会^b, 瞿晓晶^b,c, 范圣第^b,c

a 中国科学院大连化学物理研究所大连 116023;
b 大连民族学院生物技术与资源利用国家民委-教育部重点实验室大连 116600;
c 大连民族学院生命科学学院大连 116600

投稿日期:2013-11-03 发布日期:2013-12-23
通讯作者: 权春善，E-mail：mikyeken@dlnu.edu.cn E-mail:mikyeken@dlnu.edu.cn
基金资助:
项目受国家自然科学基金（Nos. 21272031，21172028）资助.

Construction of AgrC Proteoliposomes by Detergent-Mediated Method

Wang Lina^a, Quan Chunshan^b,c, Xu Yongbin^b,c, Li Xihui^b, Qu Xiaojing^b,c, Fan Shengdi^b,c

a Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Liaoning, Dalian 116023, China;
b Key Laboratory of Biotechnology and Resource Utilization, State Ethnic Affairs Commission and Ministry of Education, Dalian Nationalities University, Liaoning, Dalian 116600, China;
c Department of Life Science, Dalian Nationalities University, Dalian 116600, Liaoning, China

Received:2013-11-03 Published:2013-12-23
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21272031, 21172028).

To respond appropriately to different environmental changes, bacteria have evolved two-component signal transduction systems (TCSTs), which are absent in mammals (including human beings). A typical TCST consisted of a sensor kinase (histidine kinase, HK) and a response regulator (RR). HK is capable of autophosphorylation in response to an environmental signal, while RR interacts with the phosphorylated HK. Membrane protein AgrC is a sensor kinase of a TCST from Staphylococcus aureus. Illumination of signal transduction mechanism is of great significance to solve the problem of bacterial resistance. At present, the main bottleneck of membrane protein is the difficulties in obtaining large quantities of sufficiently pure and functional protein. The target protein was overexpressed in Escherichia coli, solubilized from cell membranes and purified in detergent micelles. This series of steps tend to lead to destabilizations of membrane protein and loss of function. In this study, AgrC was incorporated into liposomes by a detergent-mediated method. For standard incorporation, protein solution was added to detergent-lipid suspension containing lipid at 2.5 mmol/L at a lipid-to-protein ratio of 300 (mol/mol). For slow detergent removal, successive additions of small amounts of beads at Bio-bead-to-detergent ratios of 2 (w/w) will allow the removal of the detergent, resulting in formation of proteoliposome. The structure, morphology and average diameter of liposomes and proteoliposomes were characterized by transmission electron microscopy (TEM) and dynamic light scattering (DLS), respectively. Sucrose density gradient centrifugation was employed to separate proteoliposomes. The result showed efficiency of protein incorporation and liposomes recovery reached 80% and 90%, respectively. Thiol reagent labeling test showed the cytoplasmic domain of AgrC was almost exclusively oriented towards the inside of the liposome vesicles. In vitro phosphorylation experiments showed that kinase activity of AgrC in proteoliposomes was significantly higher than in detergent micelles. Proteoliposomes could be stored for two weeks with little loss of function. Preparation of proteoliposome not only solves the instability problem of membrane proteins, but also provides a new approach of the study of membrane protein structure, function and signal transduction mechanism in vitro.

Key words: Staphylococcus aureus, AgrC, detergent, proteoliposome, membrane protein

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Wang Lina, Quan Chunshan, Xu Yongbin, Li Xihui, Qu Xiaojing, Fan Shengdi. Construction of AgrC Proteoliposomes by Detergent-Mediated Method[J]. Acta Chimica Sinica, 2014, 72(2): 233-240.

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利用表面活性剂介导的方法制备AgrC蛋白脂质体

Construction of AgrC Proteoliposomes by Detergent-Mediated Method

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