The membrane proximal external region (MPER) of gp41 is extremely conserved among diverse HIV-1 variants, implying its important role in viral infection. Interestingly, two of the most broadly neutralizing antibodies,...The membrane proximal external region (MPER) of gp41 is extremely conserved among diverse HIV-1 variants, implying its important role in viral infection. Interestingly, two of the most broadly neutralizing antibodies, 2F5 and 4E10, specifically recognize this region. Our previous study demonstrated that the antigenicity and immunogenicity of 4E10 epitope are affected by remodeling gp41 fusion core, suggesting that the MPER may be associated with gp41 core and involved in gp41-mediated membrane fusion. Here we measured the binding activity of 4E10 epitope peptide (D4E10P) with various gp41 core-derived peptides and found that the N-trimer region in a construct designated N-trimer-6HB interacted significantly with D4E10P. Using N-trimer-6HB to screen a phage library, we identified a motif (WF) located in 4E10 epitope that may play a certain role in the interaction of gp41 MPER with the N-trimer in gp41 fusion core and, we thus speculated upon the potential involvement of MPER in the fusion process between viral envelope and target cell membrane.展开更多
以二乙烯三胺五乙酸、氢氧化钠和溴代十二烷为原料,通过中和反应和亲核取代反应合成了一种甜菜碱表面活性剂——N,N',N''-十二烷基二乙烯三胺五乙酸钠(DDTP),通过核磁氢谱和红外光谱对化合物的结构进行表征,测定了不同浓度...以二乙烯三胺五乙酸、氢氧化钠和溴代十二烷为原料,通过中和反应和亲核取代反应合成了一种甜菜碱表面活性剂——N,N',N''-十二烷基二乙烯三胺五乙酸钠(DDTP),通过核磁氢谱和红外光谱对化合物的结构进行表征,测定了不同浓度的DDTP水溶液的表面张力,得出表面张力曲线,进而算出其他相关参数。实验结果证明:合成的化合物结构与预期的表面活性剂结构相吻合,在25℃时,临界胶束浓度ccmc=1.1×10-2mmol/L,相应的表面张力γcmc=33.2 m N/m;表面张力降低20 m N/m时所需表面活性剂浓度的负对数p C20=3.22,饱和吸附量Γmax=5.15×10-3mol/cm2,平均每个分子占有的最小面积Amin=3.1 nm2,表明N,N',N''-十二烷基二乙烯三胺五乙酸钠具有较好的表面活性。展开更多
人类Ⅰ型免疫缺陷病毒(human immunodeficiency class I, HIV-1)包膜蛋白gp41的近膜端外部区(membrane proximal external region, MPER)在HIV-1的各个分化株之间相当保守,这暗示MPER区对于病毒的生存和侵染均具有十分重要的作用.目前...人类Ⅰ型免疫缺陷病毒(human immunodeficiency class I, HIV-1)包膜蛋白gp41的近膜端外部区(membrane proximal external region, MPER)在HIV-1的各个分化株之间相当保守,这暗示MPER区对于病毒的生存和侵染均具有十分重要的作用.目前研究表明,两个靶向HIV-1且具有最广泛中和活性的单抗2F5和4E10,都特异地识别该区域,进而有效地抑制包膜蛋白介导的病毒膜融合过程.我们先前的研究表明,4E10抗体表位的抗原性和免疫原性会随着gp41融合核心区域的结构调整而发生显著的改变,提示在gp41蛋白的MPER区与融合核心区之间很有可能存在某种联系,并与gp41介导的膜融合过程相关.本研究利用各种不同的gp41融合核心区衍生多肽,检测了4E10表位多肽(D4E10P)与它们之间的反应性.其中,具有gp41蛋白核心区N-trimer结构的多肽(N-trimer-6HB)显示出很强的结合活性.进一步对N-trimer-6HB多肽进行噬菌体文库筛选,发现4E10表位上一个短的模体序列(WF)很有可能对gp41的N-trimer和MPER区之间的相互作用发挥了至关重要的作用,导致MPER区以潜在的方式参与病毒包膜和靶细胞膜间的融合过程.展开更多
运用密度泛函理论在B3LYP/6-31++G**理论水平研究N,N-二甲基脲二聚体和三聚体氢键结构.构型优化和频率计算得到3个稳定的二聚体和三聚体氢键异构体.经基组重叠误差和零点振动能校正后,最稳定的二聚体和三聚体的相互作用能分别为-48.52和...运用密度泛函理论在B3LYP/6-31++G**理论水平研究N,N-二甲基脲二聚体和三聚体氢键结构.构型优化和频率计算得到3个稳定的二聚体和三聚体氢键异构体.经基组重叠误差和零点振动能校正后,最稳定的二聚体和三聚体的相互作用能分别为-48.52和-72.15 kJ/mol.振动分析表明二聚体和三聚体存在典型的红移氢键.热力学分析显示,298.15 K和标准压力下,二聚体和三聚体的形成是一个放热过程.Abstract：The hydrogen bonding structures of the N,N-Dimethylurea dimer and trimer have been investigated using density functional theory at B3LYP/6-31++G** level. Three stable structures of the dimer and trimer have been obtained by the optimized geometries and frequencies calculation. After basis set superposition error and zero-point vibration energy correction, it is found that the most stable dimer and trimer have strong hydrogen bonding interaction with -48.52 and -72.15 kJ/mol. Vibration analysis show that dimer and trimer have typical red-shift hydrogen bond. In addition, thermal stability indicates that the formation of dimer and trimer at 298.15K and standard pressure is a exothermic process.展开更多
基金Supported by National Key Basic Research and Development Program of China (Grant No. 2007CB914402)
文摘The membrane proximal external region (MPER) of gp41 is extremely conserved among diverse HIV-1 variants, implying its important role in viral infection. Interestingly, two of the most broadly neutralizing antibodies, 2F5 and 4E10, specifically recognize this region. Our previous study demonstrated that the antigenicity and immunogenicity of 4E10 epitope are affected by remodeling gp41 fusion core, suggesting that the MPER may be associated with gp41 core and involved in gp41-mediated membrane fusion. Here we measured the binding activity of 4E10 epitope peptide (D4E10P) with various gp41 core-derived peptides and found that the N-trimer region in a construct designated N-trimer-6HB interacted significantly with D4E10P. Using N-trimer-6HB to screen a phage library, we identified a motif (WF) located in 4E10 epitope that may play a certain role in the interaction of gp41 MPER with the N-trimer in gp41 fusion core and, we thus speculated upon the potential involvement of MPER in the fusion process between viral envelope and target cell membrane.
文摘以二乙烯三胺五乙酸、氢氧化钠和溴代十二烷为原料,通过中和反应和亲核取代反应合成了一种甜菜碱表面活性剂——N,N',N''-十二烷基二乙烯三胺五乙酸钠(DDTP),通过核磁氢谱和红外光谱对化合物的结构进行表征,测定了不同浓度的DDTP水溶液的表面张力,得出表面张力曲线,进而算出其他相关参数。实验结果证明:合成的化合物结构与预期的表面活性剂结构相吻合,在25℃时,临界胶束浓度ccmc=1.1×10-2mmol/L,相应的表面张力γcmc=33.2 m N/m;表面张力降低20 m N/m时所需表面活性剂浓度的负对数p C20=3.22,饱和吸附量Γmax=5.15×10-3mol/cm2,平均每个分子占有的最小面积Amin=3.1 nm2,表明N,N',N''-十二烷基二乙烯三胺五乙酸钠具有较好的表面活性。
文摘人类Ⅰ型免疫缺陷病毒(human immunodeficiency class I, HIV-1)包膜蛋白gp41的近膜端外部区(membrane proximal external region, MPER)在HIV-1的各个分化株之间相当保守,这暗示MPER区对于病毒的生存和侵染均具有十分重要的作用.目前研究表明,两个靶向HIV-1且具有最广泛中和活性的单抗2F5和4E10,都特异地识别该区域,进而有效地抑制包膜蛋白介导的病毒膜融合过程.我们先前的研究表明,4E10抗体表位的抗原性和免疫原性会随着gp41融合核心区域的结构调整而发生显著的改变,提示在gp41蛋白的MPER区与融合核心区之间很有可能存在某种联系,并与gp41介导的膜融合过程相关.本研究利用各种不同的gp41融合核心区衍生多肽,检测了4E10表位多肽(D4E10P)与它们之间的反应性.其中,具有gp41蛋白核心区N-trimer结构的多肽(N-trimer-6HB)显示出很强的结合活性.进一步对N-trimer-6HB多肽进行噬菌体文库筛选,发现4E10表位上一个短的模体序列(WF)很有可能对gp41的N-trimer和MPER区之间的相互作用发挥了至关重要的作用,导致MPER区以潜在的方式参与病毒包膜和靶细胞膜间的融合过程.
文摘运用密度泛函理论在B3LYP/6-31++G**理论水平研究N,N-二甲基脲二聚体和三聚体氢键结构.构型优化和频率计算得到3个稳定的二聚体和三聚体氢键异构体.经基组重叠误差和零点振动能校正后,最稳定的二聚体和三聚体的相互作用能分别为-48.52和-72.15 kJ/mol.振动分析表明二聚体和三聚体存在典型的红移氢键.热力学分析显示,298.15 K和标准压力下,二聚体和三聚体的形成是一个放热过程.Abstract：The hydrogen bonding structures of the N,N-Dimethylurea dimer and trimer have been investigated using density functional theory at B3LYP/6-31++G** level. Three stable structures of the dimer and trimer have been obtained by the optimized geometries and frequencies calculation. After basis set superposition error and zero-point vibration energy correction, it is found that the most stable dimer and trimer have strong hydrogen bonding interaction with -48.52 and -72.15 kJ/mol. Vibration analysis show that dimer and trimer have typical red-shift hydrogen bond. In addition, thermal stability indicates that the formation of dimer and trimer at 298.15K and standard pressure is a exothermic process.
