华南理工大学学报(自然科学版) ›› 2003, Vol. 31 ›› Issue (11): 73-76.

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抗 HBsAg 单链抗体的等电点测定和结构模拟

熊 盛1 王一飞1 钱垂文1 罗 勇1 陈文吟2 饶桂荣2 粟宽源2 余宙耀2   

  1. 1.暨南大学 生物医药研究开发基地‚广东 广州510630;2.解放军458医院 全军传染病中心‚广东 广州510602
  • 出版日期:2003-11-20 发布日期:2022-06-16
  • 作者简介:熊盛(1972-)‚男‚工学博士‚助理研究员‚主 要从事生物技术药物研究.
  • 基金资助:
    国家863高技术研究资助项目(2001AA215041); 广州市科技局重大攻关项目基金资助项目(99-2-010-01) 

Isoelectric Point Determination and Structure Modeling of a Single-chain Fv Against HBsAg

Xiong Sheng 1 Wang Y-i fei 1 Qian Chu-i wen 1 Luo Y ong 1 Chen Wen-yin 2 Rao Gu-i rong 2 Su Kuan-yuan 2 Y u Zhou-yao 2    

  1. 1.Bio-medical Research and Development Center‚Jinan University‚Guangzhou510630‚China; 2.Center of Infectious Diseases‚the458th Hospital of PLA‚Guangzhou510602‚China
  • Online:2003-11-20 Published:2022-06-16

摘要: 应用实验生物学和计算生物学方法对重组人源抗 HBsAg 单链抗体(HBscFv)的 部分理化性质和空间结构进行分析.首先应用蛋白质分析软件包 Antheprot 预测 HBscFv 等电点‚然后等电聚焦测定 HBscFv 等电点‚在此基础上‚用神经网络法预测 HBscFv 二级结构‚然后用同源建模的方法‚获得 HBscFv 三级结构.结果发现‚HBscFv 等电 点理论值为8.51‚实验值为7.3~8.1;PHDsec 结果表明‚HBscFv 是一种全β蛋白质;三 级结构建模表明‚HBscFv 的 VH 结构域由9个片层组成‚VL 结构域由8个片层组成;由 于单链抗体的特殊性‚三级结构建模无法给出 VH 与 VL 结构域之间进一步折叠后形成 的结构. 

关键词: 乙肝表面抗原, 单链抗体, 等电点, 结构预测, 重组人源抗体

Abstract: To identify the3D structure and physical and chemical character of a single-chain Fv against HBsAg (HBscFv)‚methods of experimental biology and computational biology were applied.First‚Antheprot‚a comprehensive software to analyze protein‚was used to predict the isoelectric point (pI) of HBscFv.Second‚the predicted result was confirmed by IEF.Third‚neural network systems (PHDsec) and SWISS-MODEL were applied to predict the secondary and tertiary structure of HBscFv‚respectively.It was found that the theoretical pI of HBscFv is8.51and the experimental pI is from7.3to8.1. PHDsec indicated that HBscFv is a whole β-globin.The predicted tertiary structure displayed that the VH domain of HBscFv was made up of9β-sheets and VL domain of8β-sheets.Due to the specific characteristics of single-chain Fv‚SWISS-MODEL software for homo-logy modeling of tertiary structure cannot predict the quaternary structure resulting from the interaction of VH and VL domains.

Key words: HBsAg, single-chain Fv, isoelectric point, structure prediction, recombinant human antibody

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