鲫卵黄脂磷蛋白的纯化鉴定及其夹心ELISA的建立
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中国海洋大学 海洋生命学院, 山东 青岛 266003

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张振忠(1992-),男,硕士研究生,专业方向为生态毒理学.E-mail:zhangzz178@126.com

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X52;S917

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国家自然科学基金项目(21607144).


Purification and characterization of lipovitellin from crucian carp (Carassius carassius) and establishment of a sandwich ELISA
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Marine Life Science College, Ocean University of China, Qingdao 266003, China

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    摘要:

    鲫()卵黄原蛋白(vitellogenin,Vtg)是检测水体环境雌激素活性常用的生物标志物。本研究利用凝胶过滤结合离子交换层析与选择性沉淀结合离子交换层析2种方法,从鲫卵巢匀浆液中纯化得到了卵黄脂磷蛋白(lipovitellin,Lv),经鉴定该蛋白含有糖、磷、脂基团,天然分子量约为521 kD,SDS变性电泳显示分子量为117 kD和103 kD的2个亚基。Western blot结果显示,金鱼()Lv抗体都能与鲫Lv发生很好的交叉反应。利用纯化的鲫Lv与金鱼Lv抗体和斑马鱼Lv抗体建立了2种夹心ELISA,发现金鱼Lv和鲫Lv的结合曲线基本重合,并且利用鲫Lv与金鱼Lv抗体建立的夹心ELISA工作范围为15.6~1000 ng/mL,检出限约为6.8 ng/mL,显著低于利用斑马鱼Lv抗体建立的夹心ELISA,结合此前研究者建立的鲫Vtg竞争ELISA,为鲫Vtg指标的测定提供了可靠方法。

    Abstract:

    Crucian carp () vitellogenin (Vtg) is a commonly used biomarker for the detection of estrogenic activity in aquatic environments. In this study, gel filtration combined with ion-exchange chromatography and selective precipitation combined with ion-exchange chromatography were used to purify lipovitellin (Lv) from ovarian homogenates of crucian carp. Lv was identified as a phospholipogly coprotein with an apparent molecular weight of~521 kD and separated into two major polypeptides corresponding to~117 and~103 kD by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The results of the western blot showed that both anti-goldfish () Lv antibodies had good cross-reaction with crucian carp Lv. Using anti-goldfish Lv antibody, anti-zebrafish Lv antibody, and purified crucian carp Lv, two sandwich enzyme-linked immunosorbent assays (ELISAs) were established. The results showed that the binding curves of goldfish Lv and crucian carp Lv basically overlapped. The sandwich ELISA developed using anti-goldfish Lv antibodies and purified crucian carp Lv had a working range form 15.6 to 1000 ng/mL and a detection limit of 6.8 ng/mL, which was significantly lower than that of the anti-zebrafish Lv antibody-based ELISA and other ELISAs previously reported for crucian carp Vtg. Therefore, we suggest that it is a reliable tool for the quantification of crucian carp Vtg.

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张振忠,马淑伟,郑明驿,王军,汝少国.鲫卵黄脂磷蛋白的纯化鉴定及其夹心ELISA的建立[J].中国水产科学,2018,25(1):53-59
ZHANG Zhenzhong, MA Shuwei, ZHENG Mingyi, WANG Jun, RU Shaoguo. Purification and characterization of lipovitellin from crucian carp (Carassius carassius) and establishment of a sandwich ELISA[J]. Journal of Fishery Sciences of China,2018,25(1):53-59

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  • 在线发布日期: 2018-01-19
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