Page 138 - 《精细化工》2020年第4期
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第 37 卷第 4 期                             精   细   化   工                                  Vol.37, No.4
             202 0 年 4 月                             FINE CHEMICALS                                 Apr.  2020


              医药与日化原料
                       兼性离子修饰亲水磁珠固定化谷胱甘肽-S-


                                           转硫酶 P1 及其表征



                                                          1
                                                                       1
                                             1
                                1
                                                                                                1*
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                       杨林玉 ,同婷婷 ,李欣蓬 ,陈   童 ,廖   飞 ,杨晓兰
                 (1.  重庆医科大学  检验医学院,临床检验诊断学教育部重点实验室,重庆  400016;2.  重庆理工大学  药
                 学与生物工程学院,重庆  401135)
                 摘要:谷胱甘肽-S-转硫酶 P1(Human glutathione-S-transferase π1,hGSTP1)为肿瘤耐药增敏药靶。为探索磁珠
                 固定化 hGSTP1 的合适方案用于磁分离指数富集从混合物中筛选高亲和力配体,重组表达 6×His-hGSTP1,分别
                     2+
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                 用 Ni -NTA 琼脂糖和 GSH-Sepharose 4B 层析柱纯化,采用亲水兼性离子修饰的羧基磁珠和 Ni -NTA 磁珠固定
                 化 6×His-hGSTP1,表征其固定化容量、保留活性、稳定性以及对抑制剂响应性。羧基磁珠不能有效固定
                                                            2+
                 GSH-Sepharose 4B 层析柱纯化 hGSTP1,可有效固定 Ni -NTA 层析柱纯化 hGSTP1,但最大保留酶活仅约 30%。
                   2+
                 Ni -NTA 磁珠可有效固定两种方法纯化蛋白,其饱和固载容量约为羧基磁珠的 1.7 倍且最大保留酶活均可达
                        2+
                 80%。Ni -NTA 磁珠固定化 hGSTP1 在 pH 6.5 PBS 中 0  ℃振摇 8 h 活性未见明显改变,相同条件游离酶活性下
                                                            2+
                 降约 20%;在筛选后甲醇 80  ℃处理 20 min 不脱落。Ni -NTA 磁珠固定化 hGSTP1 和游离酶对抑制剂依他尼酸
                                                                     2+
                 (Ethacrynic acid,EA)的 IC 50 无显著性差异(P>0.05)。因此,Ni -NTA 磁珠固定化 hGSTP1 可适用于指数富
                 集筛选混合物库中抑制剂。
                 关键词:谷胱甘肽-S-转硫酶;固定化;磁珠;混合物筛选;医药原料
                 中图分类号:O629.8      文献标识码:A      文章编号:1003-5214 (2020) 04-0772-07



                      Immobilization and characterization of glutathione-S-transthiase
                              P1 on zwitterion-coated hydrophilic magnetic beads


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                     YANG Linyu , TONG Tingting , LI Xinpeng , CHEN Tong , LIAO Fei , YANG Xiaolan
                 (1. Key Laboratory of Medical Laboratory Diagnostics of the Ministry of Education of China, College of Laboratory
                 Medicine, Chongqing Medical University, Chongqing  400016, China; 2.  School of Pharmacy and Bioengineering,
                 Chongqing University of Technology, Chongqing 401135, China)
                 Abstract: Human glutathione-S-transferase Pi isozyme (hGSTP1) is a target to tackle resistance of tumor.
                 To explore an immobilization method suitable for affinity-drive-exponential-enrichment through magnetic
                 separation for the screening of high-affinity ligands of hGSTP1 from mixtures, immobilizations of hGSTP1
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                 on zwitterion-coated magnetic beads functionalized  with Ni -NTA and  carboxyl  were compared.  The
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                 recombinant expressions of 6×his-hGSTP1 were purified by  Ni -NTA agarose column and  GSH-
                 Sepharose 4B column, respectively. The immobilization capacity, retention activity, stability and response
                 of immobilized hGSTP1 to inhibitor were characterized. Carboxyl-functionalized magnetic beads showed
                 undetectable immobilization of hGSTP1 purified with  GSH-Sepharose 4B column and exhibited certain
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                 immobilization of hGSTP1 purified with Ni -NTA agarose column, yielding about 30% retention activity
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                 of the free hGSTP1. While Ni -NTA magnetic beads could effectively immobilize hGSTP1 purified with
                 both columns, with a retention activity of about 80%, and its saturation immobilization capacity was
                                                                                          2+
                 1.7 times that of carboxyl-functionalized magnetic beads. The immobilized hGSTP1 by Ni -NTA magnetic

                 收稿日期:2019-09-12;  定用日期:2019-12-13; DOI: 10.13550/j.jxhg.20190865
                 基金项目:国家自然科学基金(31570862,81773625)
                 作者简介:杨林玉(1994—),女,硕士生,E-mail:yanglinyu_abc@163.com。联系人:杨晓兰(1968—),女,教授,E-mail:
                 xiaolanyang666@yeah.net。
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