
抗EGFRvIII噬菌体抗体库的构建和筛选
Construction and Screening of Phage Antibody Libraries Against Epidermal Growth Factor Receptor Variant Type III
目的:应用噬菌体展示技术筛选针对表皮生长因子受体突变体Ш (epidermal growth factor receptor variant type Ⅲ, EGFRvIII)的单链抗体 (single chain Fv, scFv)。方法:利用原核表达纯化的人EGFRvIIIex蛋白和高表达EGFRvIIIex的小鼠成纤维细胞系NIH3T3免疫小鼠,扩增VH和VL片段并拼装成scFv 基因,连接至噬菌粒pCANTAB 5E,电击转化Hpd3cells,构建噬菌体单链抗体库,并进行3轮富集筛选。在第4轮筛选时,采用了降低抗原浓度的方法。然后将筛选得到的阳性克隆测序分析,转化E.coli HB2151,IPTG 诱导可溶性scFv 的表达。结果:构建了库容为7.9×107 的噬菌体单链抗体库。经过第4轮低浓度抗原筛选,得到了较高亲和力的克隆。取单个阳性克隆测序分析结果表明,该抗EGFRvIII scFv 基因序列长807 bp,编码268个氨基酸。IPTG诱导后表达的可溶性scFv 可分别与纯化的EGFRvIIIex抗原以及细胞表面的EGFRvIIIex结合。结论:利用噬菌体抗体库筛选得到了高亲和力的抗EGFRvIII scFv,为开发针对EGFRvIII的抗体药物提供了靶向载体分子。
Objective: To construct a phage display library of single chain variable fragment (scFv) antibodies and to screen a scFv antibody against epidermal growth factor receptor variant type III (EGFRvIII). Method: Balb/c mice were immunized by recombinant EGFRvIIIex and NIH3T3/EGFRvIIIex cell line. Genes of variable heavy (VH) and variable light (VL) chains of antibodies were prepared by RT-PCR from the splenic cells of immunized mice and further artificially joined with a flexible peptide linker, then ligated into the phagemid vector pCANTAB 5E. The phagemides containing scFv were transformed into electrocompetent Hpd3cells. The recombinant phages were enriched through 3 rounds of affinity panning and the anti-EGFRvIII phage scFv clones were identified by ELISA. The fourth round of panning performed at a higher stringency of selection, which used a capture concentration of 0.5μg or 0.05μg. After identified by ELISA, one positive clone was sequenced and transfected into E.coli HB2151 cells to express. Result: A phage display library with a complexity of approximately 7.9×107 was constructed. After the fourth round of panning performed at a increasing stringency of selection, higher affinity clones were obtained. Sequencing analysis showed that the anti-EGFRvIII scFv was 807 base pairs coding 268 amino acids. The soluble scFv exhibited the binding activity to purified recombinant EGFRvIIIex protein and EGFRvIII overexpression cell line. Conclusion: The successful preparation of anti-EGFRvIII scFv will provide an EGFRvIII targeted molecule for the development of antibody-based drugs.
表皮生长因子受体突变体Ш / 噬菌体抗体库 / 单链抗体 {{custom_keyword}} /
Epidermal growth factor receptor variant type III / Phage antibody library / Single chain antibody {{custom_keyword}} /
表1 排名前4位的国家的专利数量及被引频次Table1 Patents numbers and citations of Top4 countries |
序号 | 国家 | 专利数目 | 总被引 频次 | 被引频次 大于10的 专利数目 | 被引频次大于 10的专利累 计被引频次 |
---|---|---|---|---|---|
1 | 中国 | 1 352 | 3 147 | 82 | 1 290 |
2 | 日本 | 419 | 2 068 | 57 | 1 376 |
3 | 美国 | 380 | 8 711 | 158 | 8 104 |
4 | 韩国 | 178 | 564 | 8 | 378 |
表2 MFC重点技术领域分布及主要技术来源国家Table 2 Main technical distribution and source countries of MFC technology |
序号 | IPC | 涉及技术领域 | 专利数量 | 主要技术来源国家 |
---|---|---|---|---|
1 | H01M | 直接转变化学能为电能的方法或装置 | 2 162 | 中国、日本、美国 |
2 | C02F | 水、废水、污水或污泥的处理 | 737 | 中国、日本、韩国 |
3 | C12N | 微生物或酶;其组合物 | 227 | 日本、中国、美国 |
4 | G01N | 借助于材料的理化性质测试或分析材料 | 178 | 日本、中国、美国 |
5 | C12M | 酶学或微生物学装置 | 105 | 日本、美国、中国 |
6 | C12Q | 包含酶或微生物的测定或检验方法 | 87 | 日本、美国、韩国 |
7 | C12R | 涉及微生物 | 76 | 中国、日本、美国 |
8 | C12P | 发酵或使用酶的方法合成目标化合物 | 72 | 美国、中国、日本 |
9 | C25B | 生产化合物或非金属的电解工艺或电泳工艺;其所用的设备 | 72 | 中国、美国、日本 |
10 | B01J | 化学或物理方法,如催化作用 | 60 | 中国、日本、美国 |
表3 MFC论文LDA主题识别结果(K=30)Table 3 LDA topic identification results of MFC papers |
序号 | 主题内容 | 主题强度 |
---|---|---|
1 | MFC污水处理同步发电 | 0.088 300 94 |
2 | MFC性能参数及评价指标 | 0.055 434 09 |
3 | 胞外电子传递机制 | 0.039 419 18 |
4 | MFC生物质能利用 | 0.037 892 68 |
5 | MFC电解产氢 | 0.035 797 99 |
6 | MFC电解产甲烷 | 0.035 279 24 |
7 | MFC结构健康监测 | 0.034 857 11 |
8 | MFC底物 | 0.034 700 82 |
9 | MFC还原重金属 | 0.033 189 93 |
10 | 污泥厌氧消化 | 0.033 006 46 |
11 | 沉积物MFC | 0.032 229 56 |
12 | 阳极生物膜 | 0.031 433 28 |
13 | MFC脱盐、海水淡化 | 0.031 208 62 |
14 | 脱氮微生物群落结构 | 0.031 081 72 |
15 | 纯菌型MFC/混菌型MFC | 0.030 726 48 |
16 | MFC制备 | 0.030 687 91 |
17 | 光合MFC | 0.030 620 78 |
18 | 石油污染土壤的生物修复 | 0.029 987 36 |
19 | 酶生物燃料电池 | 0.029 969 62 |
20 | 生物传感器 | 0.029 848 93 |
21 | 产电基因工程菌 | 0.029 818 23 |
22 | 产电微生物种群生长数学建模 | 0.028 980 11 |
23 | 分隔膜 | 0.028 850 97 |
24 | 生态修复 | 0.028 538 58 |
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国家“863”计划(2007AA021203)、上海市青年科技启明星计划(07QA14046)资助项目
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