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2025年4月4日 星期五
  2017, Vol. 25 Issue (7): 1111-1118    
  研究资源与技术改进 本期目录 | 过刊浏览 | 高级检索 |
奶山羊SCD的多克隆抗体制备与鉴定
邱思源1,罗军2,晏原3,朱江江1,马功珍4
1. 西北农林科技大学
2. 西北农林科技大学动物科技学院(陕西省杨凌,邮码712100)
3. 西北农林科技大学 动物医学院
4. 西北农林科技大学 动物科技学院
Preparation and Identification of Polyclonal Antibody Against SCD of Dairy Goat (Capra hircus)
,Jun LUO, , ,
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摘要 硬脂酰辅酶A去饱和酶(stearoyl-CoA desaturase, SCD)既是乳中调控不饱和脂肪酸合成的限速酶,同时又是反刍动物肉及乳中共轭亚油酸内源合成的关键酶。为了制备奶山羊(Capra hircus) SCD的多克隆抗体并进行初步应用。本研究通过生物信息学分析选取SCD基因片段,采用PCR方法扩增SCD基因,连接至pET32a(+)载体上,原核表达载体pET32a(+)-SCD转化到大肠杆菌(Escherichia coli) Rosetta(DE3)中诱导表达。使用组氨酸标签蛋白纯化琼脂糖磁珠纯化融合蛋白,纯化的SCD蛋白皮下免疫兔子(Oryctolagus cuniculus)制备多克隆抗体,酶联免疫吸附(enzyme-linked immuno sorbent assay, ELISA)和Western blot检测血清效价和特异性。PCR扩增获得SCD基因N端210 bp的序列,成功诱导原核表达载体pET32a(+)-SCD在25 ℃、1 mmol/L异丙基-β-d-硫代半乳糖苷(isopropyl-β-d-thiogalactoside, IPTG)、12 h条件下表达,在Rosetta (DE3)上清中获得了可溶的SCD重组蛋白。ELISA检测结果表明,制备的SCD多抗效价达1∶64 000,能特异性检测原核和真核细胞中表达的SCD蛋白。本研究成功表达并纯化了SCD融合蛋白,同时获得了高效价及高特异性的山羊SCD多抗,为进一步研究SCD在羊奶短中链脂肪酸代谢中的调控功能提供了重要的实验工具。
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邱思源
罗军
晏原
朱江江
马功珍
关键词 奶山羊硬脂酰辅酶A去饱和酶(SCD)基因原核表达亲和纯化多克隆抗体    
Abstract:Stearoyl-CoA desaturase (SCD), which is also called delta-9 desaturase, is the rate-limiting enzyme of regulating unsaturated fatty acids synthesis in milk, and being as a key enzyme for endogenous synthesis of the conjugated linoleic acid in the meat and milk of ruminants. It has the ability to catalyze saturated fatty acyl coenzyme A to generate monounsaturated fatty acyl coenzyme A. Most importantly, SCD takes an effect on the fatty acids composition and the contents of unsaturated fatty acids in goat (Capra hircus) milk. However, a lack of appropriate tools has hampered further study of SCD. Therefore, goat specific SCD antibody is necessary for the function research of SCD gene fatty acid regulation. The objective of this study was to prepare rabbit (Oryctolagus cuniculus) polyclonal antibodies (pAbs) against SCD through prokaryotically expression and SCD protein purification. The clarified function of the antibody would provide effective tools for the study of SCD functions in fatty acids metabolism. The SCD gene sequence was chosen through bioinformatic analysis mainly using DNAStar software. SCD was amplified by PCR from the cDNA. SCD gene of dairy goat was then sub-cloned into the vector pET32a(+) to construct recombinant plasmid pET32a(+)-SCD which was transformed into Escherichia coli Rosetta (DE3) expression strain. SCD fusion protein was purified by His-tag protein purification kit. Purified fusion protein being mixed with adjuvant was used as antigen to immune 6 months of rabbits to prepare polyclonal antibodies. Enzyme-linked immunosorbent assay (ELISA) was used to detect the titer of the immune serum. The obtained SCD polyclonal antibodies were used for specificity identification. The sequence with a total of 210 bp length at SCD gene N-terminal was amplified by PCR, and the prokaryotic expression vector pET32a(+)-SCD was successfully constructed. Recombinant protein was successfully expressed in E. coli Rosetta (DE3). Western blotting result showed that SCD fusion protein was correctly expressed which had 6×His tag. Recombinant protein molecular weight was about 30 kD, consistent with the expected protein molecular weight. The best expression condition was identified as follows, 25 ℃, 1 mmol/L of (isopropyl-β-d-thiogalactoside, IPTG), induction for 12 h; SCD fusion protein was mainly expressed in soluble form. Then, the fusion protein from supernatant of lysates was purified using His-tag protein purification beads. The concentration of the obtained protein was 2.5 mg/mL determined by bicinchoninic acid (BCA) Protein Assay Kit. The purified protein was used as antigen to immune rabbits and prepare polyclonal antibody successfully. ELISA result suggested the final titer of the SCD pAbs was 1∶64 000. Western blot analysis showed that the SCD pAbs could identify the specific antigen epitope on the SCD protein expressed in the form of fusion protein and the natural protein. In conclusion, the SCD protein was successfully expressed and purified. The polyclonal antibody with high reactivity and specificity was successfully prepared, which could help researchers explore the biological functions of SCD in future studies.
Key wordsDairy goat    Stearoyl-CoA desaturase (SCD) gene    Prokaryotic expression    Affinity purification    Polyclonal antibody
收稿日期: 2016-12-26      出版日期: 2017-06-16
通讯作者: 罗军     E-mail: luojun@nwsuaf.edu.cn
引用本文:   
邱思源 罗军 晏原 朱江江 马功珍. 奶山羊SCD的多克隆抗体制备与鉴定[J]. , 2017, 25(7): 1111-1118.
Jun LUO. Preparation and Identification of Polyclonal Antibody Against SCD of Dairy Goat (Capra hircus). , 2017, 25(7): 1111-1118.
链接本文:  
http://journal05.magtech.org.cn/Jwk_ny/CN/     或     http://journal05.magtech.org.cn/Jwk_ny/CN/Y2017/V25/I7/1111
 
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