鸡白细胞介素15基因的克隆及在大肠杆菌和昆虫细胞中的表达
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摘要
白细胞介素15(IL-15)是1994年才发现的一种能促进细胞生长和分化的细胞因子,主要由天然免疫细胞产生。它与白细胞介素2(IL-2)有相似的生物学活性,但其结构和组成与IL-2毫无相似之处。已有的研究表明,鸡细胞因子在功能活性方面与人类和哺乳动物的细胞因子相似,尤其是IL-2与干扰素γ(IFN-γ)均具有较强的免疫增强作用。鸡IL-15(ChIL-15)是一种新发现的且与IL-2活性相似的细胞因子,作为疫苗佐剂研究的重要候选细胞因子有巨大潜力。
     参考已发表的ChIL-15基因序列,设计合成引物,应用RT-PCR技术从刀豆球蛋白A(ConA)活化的白来航鸡脾淋巴细胞中克隆ChIL-15 cDNA,将其与SmalⅠ酶切处理的pUC19载体连接,构建重组质粒pUC19ChIL-15;用PCR技术从pUC19ChIL-15中扩增出去信号肽的成熟ChIL-15(mChIL-15)基因,与pMD 18-T载体相连构建重组质粒pMDChIL-15;然后用KpnⅠ/PstⅠ双酶切下mChIL-15基因片段,定向亚克隆到经同样酶切处理的带有6个组氨酸标签的表达载体pP_RoEX~(TM)HTa中,构建重组质粒pP_RoChIL-15,对其测序确认读框正确后,转入大肠杆菌DH5α中诱导表达并进行纯化,用重组ChIL-15(rChIL-15)免疫豚鼠,制备多克隆抗体;再用HindⅢ/PstⅠ从质粒pP_RoChIL-15上切下mChIL-15基因,定向亚克隆到经同样酶切处理的杆状病毒转移载体pMelBacB中,经酶切、PCR和序列测定鉴定后,与杆状病毒线形化DNA(Bac-N-Blue~(TM) DNA)共转染Sf9昆虫细胞,经三轮蚀斑纯化,构建重组杆状病毒rBac-ChIL-15,用该重组病毒感染处于对数生长期的Sf9细胞,按不同的时间收取样品,离心后对其上清和沉淀进行SDS-PAGE和Western blot分析。
     结果显示,本研究所用白来航鸡IL-15 cDNA 5’非编码区有两个框外ATG起始密码子,开放阅读框由564bp组成,编码187个氨基酸,其中N末端信号肽含有66个氨基酸残基,在第48、149和166位的天冬酰胺残基上有三个潜在的N-糖基化位点。mChIL-15含有4个高度保守的半胱氨酸残基,可形成两个链内二硫键。与已发表的ChIL-15基因序列相比,该序列编码区第365、397、407、457、474、556、557位的核苷酸发生了变化,分别由A、C、G、G、A、G、C依次变成了G、T、T、T、G、A、T,推导的氨基酸序列在第122、133、136、153和186位发生了改变,分别由原来的天冬氨酸、精氨酸、色氨酸、丙氨酸、丙氨酸依次变成了甘氨酸、色氨酸、亮氨酸、丝氨酸和异亮氨酸,其中第474位碱基的变化是同义突变,这表明ChIL-15可能存在多态性;rChIL-15融合蛋白在大肠杆菌中得到了成功表达,其分子量约为18 kDa,扫描分析含量在30%左右,用离子亲和树脂对rChIL-15进行了有效的纯化,并成功制备出了豚鼠抗rChIL-15多克隆抗体;重组杆状病毒rBac-ChIL-15感染Sf9细胞后24小时已表达rChIL-15蛋白,96小时表达量达到高峰,其分子量约为22 kDa,占细胞总蛋白的25%,在Western blot实验中,该重组蛋白可被豚鼠抗原核rChIL-15多克隆抗体识别。
Interleukin-15 (IL-15) is a multifunctional cytokine that plays a major role in promoting cell growth and differentiation. IL-15 is produced mainly by natural immunocyte. In mammals, IL-15 shares many in vitro functions with IL-2. however, both cytokines bind to receptors with uniqe a chians enabling IL-15 and IL-2 to mediate very different functions in vivo. Recent results have shown that chicken cytokines share similar biological activity with mammalian cytokines, especially, in immunological enhancement of IL-2 and IFN- . Chicken IL-15(ChIL-15), Which was discovered in 2001, plays a main role in activating NK cells and CD8+ memory T cells, and may therefore have potential as a vaccine adjuvant.
    According to published ChIL-15 gene sequence, a pair of primers were designed and synthesized to clone ChIL-15 cDNA from ConA-activated chicken splenocytes by RT-PCR. Recombinant plasmid pUC19ChIL-15 carrying the ChIL-15 gene was constructed. The gene encoding mature ChIL-15 (mChIL-15) was amplified from pUC19ChIL-15 by PCR and cloned into pMD 18-T vector. After digested with Kpn I /Pst I , the mChIL-15 gene was subcloned into prokaryotic expression vector pPRoEX橦Ta and transformed into E.coli DH5a .The transformant was induced by IPTG, and the recombinant ChIL-15(rChIL-15) was expressed as a fusion protein with a histidine hexamer tag at the N-terminal end of the protein. Following expression, the protein was purified by ProBond?Nickel-Chelating Resin. The uninduced and induced protein lysates and the purified protein were separated by SDS-PAGE and transferred onto nitrocellulose membrane to identify rChIL-15 by Western blot. The rChIL-15 was used to immune the guinea pig to obtain rChIL-15 polyclonal ant
    ibody. The mChIL-15 gene from recombinant plasmid pPRoChIL-15 was subcloned into transfer vector pMelBacB and a recombinant vector pMelChIL-15 was constructed. Co-transfection of Sf9 insect cells with pMelChIL-15 and baculovirus linear DNA was performed. After three times purification, a recombinant baculovirus designated as rBac-ChIL-15 was obtained. The infected cells were collected at different time post-infection and analyzed by SDS-PAGE and Western blot.
    The results showed that the open reading frame of ChIL-15 cDNA encompassed 564 base pairs(bp) and encoded a protein of 187 amino acids with three potential N-linked glycosylation sites, four conserved cysteine residues, two out-of-frame ATG initiation codons in the 5' untranslated region, and a signal peptide consisting of 66 amino acids. When it was compared with the published sequence of ChIL-15 cDNA, 7 mutant sites were found, and 5 amino acids were changed in predicted amino acids, which indicated that ChIL-15 may be polymorphic. The rChIL-15 was expressed in E.coli and was approximately 18kDa in size, which accounted for 30% of total protein. The purified rChIL-15 and rChIL-15 polyclonal antibody was obtained. Expression of rChIL-15 in rBac-ChIL-15 infected Sf9 cells was detected by SDS-PAGE and Western blot, the expressed product had a molecular weight of approximately 22kDa and the expression level of the recombinant protein was up to 25% of total cell protein .
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