The phosphatidylserine-specific phospholipase A1(PLA1A)is an essential host factor in hepatitis C virus(HCV)assembly.In this study,we mapped the E2,NS2 and NS5A involved in PLA1A interaction to their lumenal domains a...The phosphatidylserine-specific phospholipase A1(PLA1A)is an essential host factor in hepatitis C virus(HCV)assembly.In this study,we mapped the E2,NS2 and NS5A involved in PLA1A interaction to their lumenal domains and membranous parts,through which they form oligomeric protein complexes to participate in HCV assembly.Multiple regions of PLA1A were involved in their interaction and complex formation.Furthermore,the results represented structures with PLA1A and E2 in closer proximity than NS2 and NS5A,and strongly suggest PLA1 A-E2,s physical interaction in cells.Meanwhile,we mapped the NS5A sequence which participated in PLA1A interaction with the C-terminus of domain 1.Interestingly,these amino acids in the sequence are also essential for viral RNA replication.Further experiments revealed that these four proteins interact with each other.Moreover,PLA1A expression levels were elevated in livers from HCV-infected patients.In conclusion,we exposed the structural determinants of PLA1A,E2,NS2 and NS5A proteins which were important for HCV assembly and provided a detailed characterization of PLA1A in HCV assembly.展开更多
目的研究亲磷酸酯酶A1(PA-PLA1)基因在小鼠分泌胰岛素细胞株M IN 6中的表达及其与胰岛素分泌的关系。方法对M IN 6细胞进行不同浓度和不同时间的葡萄糖刺激胰岛素分泌的实验,酶联免疫吸附法测定细胞上清液中胰岛素分泌量,实时荧光定量P...目的研究亲磷酸酯酶A1(PA-PLA1)基因在小鼠分泌胰岛素细胞株M IN 6中的表达及其与胰岛素分泌的关系。方法对M IN 6细胞进行不同浓度和不同时间的葡萄糖刺激胰岛素分泌的实验,酶联免疫吸附法测定细胞上清液中胰岛素分泌量,实时荧光定量PC R检测相应条件下PA-PLA1 m R N A的表达水平,线性相关分析PA-PLA1 m R N A表达水平与胰岛素分泌的相关性。结果在一定葡萄糖浓度范围内,PA-PLA1m R N A水平随着葡萄糖浓度的升高和刺激时间的延长而升高,并与细胞胰岛素分泌量呈明显的正相关。不同葡萄糖浓度和不同刺激时间的PA-PLA1 m R N A水平与胰岛素水平的相关系数r分别为0.89(P<0.01)和0.98(P<0.01)。结论小鼠分泌胰岛素细胞株M IN 6中PA-PLA1基因的表达与胰岛素分泌之间具有高度的正相关性。展开更多
基金supported by grants of the National Basic Research Priorities Program of China (2015CB554304)
文摘The phosphatidylserine-specific phospholipase A1(PLA1A)is an essential host factor in hepatitis C virus(HCV)assembly.In this study,we mapped the E2,NS2 and NS5A involved in PLA1A interaction to their lumenal domains and membranous parts,through which they form oligomeric protein complexes to participate in HCV assembly.Multiple regions of PLA1A were involved in their interaction and complex formation.Furthermore,the results represented structures with PLA1A and E2 in closer proximity than NS2 and NS5A,and strongly suggest PLA1 A-E2,s physical interaction in cells.Meanwhile,we mapped the NS5A sequence which participated in PLA1A interaction with the C-terminus of domain 1.Interestingly,these amino acids in the sequence are also essential for viral RNA replication.Further experiments revealed that these four proteins interact with each other.Moreover,PLA1A expression levels were elevated in livers from HCV-infected patients.In conclusion,we exposed the structural determinants of PLA1A,E2,NS2 and NS5A proteins which were important for HCV assembly and provided a detailed characterization of PLA1A in HCV assembly.
文摘目的研究亲磷酸酯酶A1(PA-PLA1)基因在小鼠分泌胰岛素细胞株M IN 6中的表达及其与胰岛素分泌的关系。方法对M IN 6细胞进行不同浓度和不同时间的葡萄糖刺激胰岛素分泌的实验,酶联免疫吸附法测定细胞上清液中胰岛素分泌量,实时荧光定量PC R检测相应条件下PA-PLA1 m R N A的表达水平,线性相关分析PA-PLA1 m R N A表达水平与胰岛素分泌的相关性。结果在一定葡萄糖浓度范围内,PA-PLA1m R N A水平随着葡萄糖浓度的升高和刺激时间的延长而升高,并与细胞胰岛素分泌量呈明显的正相关。不同葡萄糖浓度和不同刺激时间的PA-PLA1 m R N A水平与胰岛素水平的相关系数r分别为0.89(P<0.01)和0.98(P<0.01)。结论小鼠分泌胰岛素细胞株M IN 6中PA-PLA1基因的表达与胰岛素分泌之间具有高度的正相关性。
