Objective To try making huZP3a^22-176 and huZP3b^177-348 polypeptides （representing an intact huZP^322-348 protein without its N-terminal signal peptide and C-terminal transmembrane domain ） express in E. coli at a ...Objective To try making huZP3a^22-176 and huZP3b^177-348 polypeptides （representing an intact huZP^322-348 protein without its N-terminal signal peptide and C-terminal transmembrane domain ） express in E. coli at a higher level Methods The cDNAs encoding huZP3a and huZP3b were obtained with PCR method. The pBV221 plasmid was used to construct thermo-inducible recombinant expression vector. Purification of two target expression products employed an improved method of preparative gel polyacrylamide gel electrophoresis. Results Two polypeptides of recombinant huZP3a （rhuZP3a） and recombinant huZP3b （rhuZP3b） were all expressed respectively in an E. coli BL21（DE3）pLysS strain at a higher level, which were recognized by two specific polyclonal antisera in Western blotting test which recognize a linear B cell epitope present in rhuZP3a or rhuZP3b respectively. Using the shake-flask method, approximately 5 mg of rhuZP3a and rhuZP3b with more than 95% relative homogeneity were harvested from 1 L culture respectively. Conclusion The availability of two rhuZP3 polypeptides will help in detecting the immunogenicities of rhuZP3a and rhuZP3b through animal experiments and confirming the function domain of non-glycosylated huZP3 to induce acrosome reaction in vitro.展开更多
为了探讨毕赤酵母表达的重组人卵透明带ZP3蛋白(recombinant human zona pellucida-3 protein,rhZP3)及其多克隆抗体对小鼠和人精卵结合的影响,采用不同浓度的rhZP3以及空白培养液分别处理小鼠精子,然后再与小鼠卵子进行结合实验,观察...为了探讨毕赤酵母表达的重组人卵透明带ZP3蛋白(recombinant human zona pellucida-3 protein,rhZP3)及其多克隆抗体对小鼠和人精卵结合的影响,采用不同浓度的rhZP3以及空白培养液分别处理小鼠精子,然后再与小鼠卵子进行结合实验,观察经过不同处理的精子对透明带黏附及体外受精率的影响;用rhZP3以及空白培养液分别处理人精子,然后再与人卵子进行结合实验,观察经过不同处理的精子对透明带黏附的影响;用抗rhZP3抗体与阴性血清分别处理小鼠和人卵子,再与精子进行结合实验,观察多克隆抗体对精子粘附以及小鼠体外受精率的影响。实验结果表明,rhZP3和抗rhZP3多克隆抗体既能抑制人的体外精卵结合,也能抑制小鼠体外精卵结合,提示rhZP3具有天然透明带的特性,有发展成避孕疫苗和作为检测透明带抗体检测试剂的可能。展开更多
基金This work was supported by grant (No. 03JG05014) from the Population Family Planning Commission ofShanghai. China and the Medical and Health Science Research Foundation of Zhejiang Province(No. 2004A002)
文摘Objective To try making huZP3a^22-176 and huZP3b^177-348 polypeptides （representing an intact huZP^322-348 protein without its N-terminal signal peptide and C-terminal transmembrane domain ） express in E. coli at a higher level Methods The cDNAs encoding huZP3a and huZP3b were obtained with PCR method. The pBV221 plasmid was used to construct thermo-inducible recombinant expression vector. Purification of two target expression products employed an improved method of preparative gel polyacrylamide gel electrophoresis. Results Two polypeptides of recombinant huZP3a （rhuZP3a） and recombinant huZP3b （rhuZP3b） were all expressed respectively in an E. coli BL21（DE3）pLysS strain at a higher level, which were recognized by two specific polyclonal antisera in Western blotting test which recognize a linear B cell epitope present in rhuZP3a or rhuZP3b respectively. Using the shake-flask method, approximately 5 mg of rhuZP3a and rhuZP3b with more than 95% relative homogeneity were harvested from 1 L culture respectively. Conclusion The availability of two rhuZP3 polypeptides will help in detecting the immunogenicities of rhuZP3a and rhuZP3b through animal experiments and confirming the function domain of non-glycosylated huZP3 to induce acrosome reaction in vitro.
文摘为了探讨毕赤酵母表达的重组人卵透明带ZP3蛋白(recombinant human zona pellucida-3 protein,rhZP3)及其多克隆抗体对小鼠和人精卵结合的影响,采用不同浓度的rhZP3以及空白培养液分别处理小鼠精子,然后再与小鼠卵子进行结合实验,观察经过不同处理的精子对透明带黏附及体外受精率的影响;用rhZP3以及空白培养液分别处理人精子,然后再与人卵子进行结合实验,观察经过不同处理的精子对透明带黏附的影响;用抗rhZP3抗体与阴性血清分别处理小鼠和人卵子,再与精子进行结合实验,观察多克隆抗体对精子粘附以及小鼠体外受精率的影响。实验结果表明,rhZP3和抗rhZP3多克隆抗体既能抑制人的体外精卵结合,也能抑制小鼠体外精卵结合,提示rhZP3具有天然透明带的特性,有发展成避孕疫苗和作为检测透明带抗体检测试剂的可能。
