为探讨不同培养基对厚垣普可尼亚菌胞外蛋白质的诱导效果及相应发酵液的生化性质,以更好地利用该菌对家畜寄生性线虫进行生物防治,在本实验室前期研究的基础上,设计使用3种常用真菌液体培养基对厚垣普可尼亚菌进行发酵培养,并检测发酵...为探讨不同培养基对厚垣普可尼亚菌胞外蛋白质的诱导效果及相应发酵液的生化性质,以更好地利用该菌对家畜寄生性线虫进行生物防治,在本实验室前期研究的基础上,设计使用3种常用真菌液体培养基对厚垣普可尼亚菌进行发酵培养,并检测发酵液的蛋白质质量浓度、蛋白酶活性,磷酸酶活性及杀虫效力等,筛选出适合该菌液体培养的最佳培养基。结果表明,在3组培养基中,LMZ培养基组的蛋白质种类最丰富,蛋白质质量浓度（2 320 mg/L±10.00 mg/L）、蛋白酶活性（2.95 U/m L±0.23 U/m L）与磷酸酶活性[1.546 U/100 m L±0.035 U/100 m L（酸性磷酸酶）和0.516 U/100 m L±0.069 U/100 m L（碱性磷酸酶）]都较高,对线虫的杀虫率也是3种培养基中最高的,可达60%,与其他各组间差异极显著（P〈0.01）。因此从生物防治的角度,在试验的3种培养基中,以LMZ液体培养基为最佳选择。这一发现可为今后对厚垣普可尼亚菌液体发酵培养、杀虫物质的产生以及作用机制进行深入探究提供重要基础资料。展开更多
Pseudomonas aeruginosa remains one of the major pathogens affecting immunocompromised patients. LPS-based monovalent (MV) and polyvalent (PV) conjugate vaccines were prepared from the most prevalent strains of P. aeru...Pseudomonas aeruginosa remains one of the major pathogens affecting immunocompromised patients. LPS-based monovalent (MV) and polyvalent (PV) conjugate vaccines were prepared from the most prevalent strains of P. aeruginosa International Antigenic Typing Scheme (IATS) 6, 10, 11 and 20 to evaluate their immunogenicity and protective capacities from infection by the pathogens. Conjugation of the O-polysaccharide (O-PS) antigens of P. aeruginosa strains to the common immunogenic recombinant Exotoxin A (rEPA) supports the multi-antigenic approach for the development of a vaccine that provides cross protection against various strains of the pathogen. The O-PSs were indirectly conjugated through adipic acid dihydrazide (ADH) to rEPA by carbodiimidemediated condensation reaction. Mice were immunized with the conjugates emulsified with monophosphoryl lipid A (MPL) or Freund's adjuvant compared with conjugates without adjuvant, unconjugated mixture of rEPA and O-PS emulsified with MPL, and sterile saline. The MV and PV vaccines emulsified with MPL adjuvant elicited the highest anti-O-PS IgM and IgG antibodies. Immunization of mice with MV vaccines derived from IATS 10, 11, and 20, emulsified with MPL adjuvant provided a high level of protection against the homologous bacterial strain. Similarly, high protection was obtained when mice were immunized using PV and challenged separately with bacterial strains 10, 11, and 20, but lower protection against the IATS 6 strain. Also, high cross protection of MV vaccine derived from O-PS of IATS 10 and 20 was obtained against P. aeruginosa IATS 11 strain. The in vivo protection correlated with the level of anti-O-PS IgG in the mice serum.展开更多
目的对C群脑膜炎球菌多糖(group C meningococcal polysaccharide,GCMP)蛋白结合物的5种制备方法进行比较。方法以GCMP作为多糖抗原,破伤风类毒素(tetanus toxoid,TT)和重组绿脓杆菌外毒素A(recombinant exoprotein A from Pseudomonas ...目的对C群脑膜炎球菌多糖(group C meningococcal polysaccharide,GCMP)蛋白结合物的5种制备方法进行比较。方法以GCMP作为多糖抗原,破伤风类毒素(tetanus toxoid,TT)和重组绿脓杆菌外毒素A(recombinant exoprotein A from Pseudomonas aeruginosa,r EPA)作为载体蛋白,采用5种结合路线制备7种结合物,并对其生化指标、免疫原性及磷酸铝佐剂的免疫增强效果进行检测。结果不同的结合方法均可将不同载体蛋白与多糖有效结合,在小鼠体内均具有良好的免疫原性。7种结合物的分子大小分布、游离多糖含量、多糖/蛋白值、回收率及免疫原性等指标有较大差异;采用相同结合方法,以TT和r EPA作为载体蛋白制备的结合物的生化指标及免疫原性无差异;磷酸铝佐剂可显著提高结合物的免疫原性。结论在选择GCMP蛋白结合物制备方法时应综合考虑原料多糖的化学结构、载体蛋白类型、结合路线、结合物纯化方法、质量控制方法和剂型等因素。本实验为GCMP蛋白结合物制备路线的选择提供了实验依据。展开更多
目的确认RTX家族胞外蛋白A(RTX family exoprotein A,RfeA)为2-型猪链球菌(Streptococcus suis serotype 2,SS2)的分泌蛋白。方法通过生物信息学软件分析RfeA的氨基酸序列,预测RfeA在SS2中的分布;以纯化的RfeA重组蛋白为免疫原免疫小鼠...目的确认RTX家族胞外蛋白A(RTX family exoprotein A,RfeA)为2-型猪链球菌(Streptococcus suis serotype 2,SS2)的分泌蛋白。方法通过生物信息学软件分析RfeA的氨基酸序列,预测RfeA在SS2中的分布;以纯化的RfeA重组蛋白为免疫原免疫小鼠,制备RfeA鼠多抗血清,间接ELISA检测抗血清效价;以制备的RfeA抗血清为一抗,利用ELISA方法分析RfeA在05ZYH33株培养上清中的分布,通过实验证实生物信息学预测的结果。结果生物信息学软件分析RfeA氨基酸序列,预测RfeA为SS2分泌性蛋白;ELISA方法分析发现RfeA存在于05ZYH33株培养上清中,是SS2分泌性蛋白。结论实验研究结果与生物信息学预测一致,RfeA为SS2分泌性蛋白的确定为进一步研究RfeA的功能以及在SS2致病过程中扮演的角色奠定了基础。展开更多
文摘为探讨不同培养基对厚垣普可尼亚菌胞外蛋白质的诱导效果及相应发酵液的生化性质,以更好地利用该菌对家畜寄生性线虫进行生物防治,在本实验室前期研究的基础上,设计使用3种常用真菌液体培养基对厚垣普可尼亚菌进行发酵培养,并检测发酵液的蛋白质质量浓度、蛋白酶活性,磷酸酶活性及杀虫效力等,筛选出适合该菌液体培养的最佳培养基。结果表明,在3组培养基中,LMZ培养基组的蛋白质种类最丰富,蛋白质质量浓度（2 320 mg/L±10.00 mg/L）、蛋白酶活性（2.95 U/m L±0.23 U/m L）与磷酸酶活性[1.546 U/100 m L±0.035 U/100 m L（酸性磷酸酶）和0.516 U/100 m L±0.069 U/100 m L（碱性磷酸酶）]都较高,对线虫的杀虫率也是3种培养基中最高的,可达60%,与其他各组间差异极显著（P〈0.01）。因此从生物防治的角度,在试验的3种培养基中,以LMZ液体培养基为最佳选择。这一发现可为今后对厚垣普可尼亚菌液体发酵培养、杀虫物质的产生以及作用机制进行深入探究提供重要基础资料。
文摘Pseudomonas aeruginosa remains one of the major pathogens affecting immunocompromised patients. LPS-based monovalent (MV) and polyvalent (PV) conjugate vaccines were prepared from the most prevalent strains of P. aeruginosa International Antigenic Typing Scheme (IATS) 6, 10, 11 and 20 to evaluate their immunogenicity and protective capacities from infection by the pathogens. Conjugation of the O-polysaccharide (O-PS) antigens of P. aeruginosa strains to the common immunogenic recombinant Exotoxin A (rEPA) supports the multi-antigenic approach for the development of a vaccine that provides cross protection against various strains of the pathogen. The O-PSs were indirectly conjugated through adipic acid dihydrazide (ADH) to rEPA by carbodiimidemediated condensation reaction. Mice were immunized with the conjugates emulsified with monophosphoryl lipid A (MPL) or Freund's adjuvant compared with conjugates without adjuvant, unconjugated mixture of rEPA and O-PS emulsified with MPL, and sterile saline. The MV and PV vaccines emulsified with MPL adjuvant elicited the highest anti-O-PS IgM and IgG antibodies. Immunization of mice with MV vaccines derived from IATS 10, 11, and 20, emulsified with MPL adjuvant provided a high level of protection against the homologous bacterial strain. Similarly, high protection was obtained when mice were immunized using PV and challenged separately with bacterial strains 10, 11, and 20, but lower protection against the IATS 6 strain. Also, high cross protection of MV vaccine derived from O-PS of IATS 10 and 20 was obtained against P. aeruginosa IATS 11 strain. The in vivo protection correlated with the level of anti-O-PS IgG in the mice serum.
文摘目的对C群脑膜炎球菌多糖(group C meningococcal polysaccharide,GCMP)蛋白结合物的5种制备方法进行比较。方法以GCMP作为多糖抗原,破伤风类毒素(tetanus toxoid,TT)和重组绿脓杆菌外毒素A(recombinant exoprotein A from Pseudomonas aeruginosa,r EPA)作为载体蛋白,采用5种结合路线制备7种结合物,并对其生化指标、免疫原性及磷酸铝佐剂的免疫增强效果进行检测。结果不同的结合方法均可将不同载体蛋白与多糖有效结合,在小鼠体内均具有良好的免疫原性。7种结合物的分子大小分布、游离多糖含量、多糖/蛋白值、回收率及免疫原性等指标有较大差异;采用相同结合方法,以TT和r EPA作为载体蛋白制备的结合物的生化指标及免疫原性无差异;磷酸铝佐剂可显著提高结合物的免疫原性。结论在选择GCMP蛋白结合物制备方法时应综合考虑原料多糖的化学结构、载体蛋白类型、结合路线、结合物纯化方法、质量控制方法和剂型等因素。本实验为GCMP蛋白结合物制备路线的选择提供了实验依据。
文摘目的确认RTX家族胞外蛋白A(RTX family exoprotein A,RfeA)为2-型猪链球菌(Streptococcus suis serotype 2,SS2)的分泌蛋白。方法通过生物信息学软件分析RfeA的氨基酸序列,预测RfeA在SS2中的分布;以纯化的RfeA重组蛋白为免疫原免疫小鼠,制备RfeA鼠多抗血清,间接ELISA检测抗血清效价;以制备的RfeA抗血清为一抗,利用ELISA方法分析RfeA在05ZYH33株培养上清中的分布,通过实验证实生物信息学预测的结果。结果生物信息学软件分析RfeA氨基酸序列,预测RfeA为SS2分泌性蛋白;ELISA方法分析发现RfeA存在于05ZYH33株培养上清中,是SS2分泌性蛋白。结论实验研究结果与生物信息学预测一致,RfeA为SS2分泌性蛋白的确定为进一步研究RfeA的功能以及在SS2致病过程中扮演的角色奠定了基础。
