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中国生物工程杂志

CHINA BIOTECHNOLOGY
中国生物工程杂志  2018, Vol. 38 Issue (2): 1-6    DOI: 10.13523/j.cb.20180201
研究报告     
靶向B细胞并特异结合其分泌IL-10的重组融合蛋白的构建、表达和初步鉴定 *
赵荣,陈含宇,黄春,章晓联,潘勤()
武汉大学基础医学院免疫学系 病毒学国家重点实验室 湖北省过敏及免疫相关疾病重点实验室 武汉 430071
Construction, Expression and Identification of Recombinant Fusion Protein Specifically Targeting B Cells and Binding to IL-10
Rong ZHAO,Han-yu CHEN,Chun HUANG,Xiao-lian ZHANG,Qin PAN()
School of Basic Medical Immunology, Hubei Province Key Laboratory of Allergy and Immunology,and Department of Immunology, State Key Laboratory of Virology, Medical Research Institute,Wuhan University, Wuhan 430071, China
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摘要:

目的: CD19单链抗体可变区(single-chain fragment variable)scFv能特异性识别结合B细胞表面的CD19分子,白细胞介素-10(interleukin-10,IL-10)是调节性B细胞(Breg)的主要特征之一。旨在构建CD19scFv和IL-10受体1(IL-10R1)胞外段的重组融合蛋白,拟用该融合蛋白捕捉和封闭Breg细胞分泌的IL-10。方法: CD19scFv和IL-10R1胞外段克隆到pET-28a原核质粒上,E. coli BL21(DE3)工程菌表达蛋白通过镍柱富集和纯化蛋白,SDS-PAGE和Western blot对表达蛋白进行鉴定,Pull down实验验证蛋白与CD19分子和IL-10细胞因子的结合。结果: 成功表达CD19scFv-IL-10R1融合蛋白,该融合蛋白能在体外同时结合CD19和IL-10分子。 结论:CD19scFv-IL-10R1融合蛋白在体外可以同时结合CD19分子和IL-10分子,具有潜在应用前景可作为特异性抑制Breg的生物小分子。

关键词: IL-10调节性B细胞IL-10受体1CD19单链抗体可变区    
Abstract:

Objective: CD19 scFv (single-chain fragment variable) specifically recognizes CD19 molecule expressed on the B cells surface. Interleukin-10 (IL-10) -producing B cells are a major subset of regulatory B cells (Breg). The aim is to construct a recombinant fusion protein of CD19 scFv and IL-10 receptor1 (IL-10R1), which potentially captures and blocks IL-10 secreted by Breg cells.Methods: CD19scFv and IL-10R1 were cloned into pET-28a prokaryotic plasmid. Recombinant proteins were enriched and purified by Ni column, identified by SDS-PAGE and Western blot. Pull down analysis was performed to identify the proteins captured by CD19scFv-IL-10R1 recombinant protein.Results: The CD19 scFv-IL-10R1 fusion protein is prepared and the protein binds to both CD19 and IL-10 molecules in vitro.Conclusion: CD19scFv-IL-10R1 fusion protein binds to both CD19 molecule and IL-10 molecule in vitro, and has potential application as a specific inhibitor for Bregs.

Key words: IL-10    Regulatory B cells    IL-10R1    CD19-scFv
收稿日期: 2017-07-28 出版日期: 2018-03-21
ZTFLH:  Q819  
基金资助: * 国家自然科学基金(31771875;81471910;31370197;21572173;31770145);湖北省医学领军人才计划(523-276003);湖北省技术创新专项(2016ACA150;2016CFA062;2015CFA009);武汉市科技晨光计划 资助项目(2016070204010127)
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引用本文:

赵荣,陈含宇,黄春,章晓联,潘勤. 靶向B细胞并特异结合其分泌IL-10的重组融合蛋白的构建、表达和初步鉴定 *[J]. 中国生物工程杂志, 2018, 38(2): 1-6.

Rong ZHAO,Han-yu CHEN,Chun HUANG,Xiao-lian ZHANG,Qin PAN. Construction, Expression and Identification of Recombinant Fusion Protein Specifically Targeting B Cells and Binding to IL-10. China Biotechnology, 2018, 38(2): 1-6.

链接本文:

https://manu60.magtech.com.cn/biotech/CN/10.13523/j.cb.20180201        https://manu60.magtech.com.cn/biotech/CN/Y2018/V38/I2/1

图1  pET-28a-CD19scFv-IL-10R1的构建
图2  CD19scFv和IL-10R1 编码基因片段PCR产物的鉴定
图3  pET-28a-CD19scFv和pET-28a-CD19scv-IL-10R1克隆双酶切琼脂糖凝胶电泳鉴定
图4  25℃诱导CD19scFv蛋白表达结果
图5  不同温度和不同IPTG浓度诱导温度下蛋白诱导表达结果
图6  CD19scFv 和CD19scFv-IL-10R1重组蛋白纯化结果SDS-PAGE和Western blot 验证
图7  CD19scfv-IL-10R1能同时结合CD19和IL-10分子
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