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黄鳝肠道cDNA文库构建、EST分析及抗菌肽基因的原核表达
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摘要
黄鳝(Monopterus albus)是广泛分布于我国南北水域的名优水产养殖品种之一。本文运用分子生物学、生物信息学、基因工程等技术与方法,通过构建肠道cDNA文库对黄鳝肠道内营养代谢、免疫相关功能基因进行了一些初步分析与探讨;并对黄鳝抗菌肽hepcidin的原核表达进行了初步研究。
     首次成功构建了黄鳝全肠未剪切cDNA文库。经检测,文库的库容量达到1.46×107cfu,重组阳性克隆率为96.88%,平均插入片段约2.11kb,符合高质量文库要求。随机从文库中挑取1056个阳性克隆进行5’单向测序,去除载体序列与低质量序列后获得了906条高质量的EST序列,平均长度为812bp,并提交到dbEST数据库(GenBank accession number:GW584265-GW585168)。通过拼接与组装,共获得762条有效的一致序列,其中61个重叠群包含2条以上的EST,其余701个仅含有一条EST。运用NCBI BLAST对序列进行比对,SeqGO进行功能注释。鉴定出与营养相关的EST共有5类,59种:蛋白质氨基酸代谢类25种,碳水化合物代谢类13种,脂类代谢类5种,能量代谢类12种,无机离子代谢类4种;发现免疫相关基因共73个,首次证实了肠道内存在大量与黄鳝免疫功能相关的基因,其中包括几丁质酶、溶菌酶、凝集素、抗氧化酶类、主要组织相容性复合体(MHC)、热休克蛋白(HSP)、IgM等;在黄鳝肠道中还发现了嗜酸性粒细胞趋化因子(ECC),这是该基因首次在硬骨鱼类中得到证实。
     应用PCR技术从文库中筛选出了黄鳝抗菌肽基因hepcidin(GenBank accession number:GU997139),应用在线分析软件,对筛选的抗菌肽基因hepcidin进行了序列分析,发现其ORF区域为273bp,编码90个氨基酸残基的阳离子抗菌肽,分子量为10236Da。进一步分析抗菌肽蛋白质序列,包含24个氨基酸的信号肽和40个氨基酸的前域部分,成熟肽为26肽,结构预测显示其属于β-折叠类抗菌肽,包含有hepcidin类抗菌肽典型的8个半胱氨酸结构,形成4对二硫键。同源比对发现黄鳝hepcidin与多种动物的hepcidin序列高度同源,与大黄鱼和黑鲈hepcidin的相似性高达81%。
     利用基因工程技术,首次对黄鳝hepcidin基因在原核细胞中表达进行了初步研究。分别构建了pET22b(+)重组表达载体,发现黄鳝抗菌肽hepcidin基因构建的pET22b(+)表达载体在原核细胞中不能表达。通过pET43. la(+)构建黄鳝hepcidin基因融合表达载体,转化到BL21(DE3)pLysS, BL21Star(DE3)pLysS和BL21-CondonPlus (DE3)-RIPL三种表达菌株中进行诱导表达,重组pET43. la(+)-hepcidin在原核细胞中均无明显表达。在pET32a(+)载体中分别构建黄鳝hepcidin全长编码序列(pET32a(+)-hepcidin)和去信号肽序列(pET32a(+)-nhepcidin)重组表达载体,转化到BL21(DE3)pLysS, BL21Star(DE3)pLysS, BL21-CondonPlus (DE3)-RIPL三种不同的表达菌株中进行诱导表达,发现含有信号肽的pET32a(+)-hepcidin重组表达载体在三种菌株中均不能正常表达;而不含信号肽的pET32a(+)-nhepcidin重组表达载体在BL21-CondonPlus (DE3)-RIPL中能高效表达。通过优化诱导表达条件,获得黄鳝抗菌肽pET32a(+)-nhepcidin重组载体在BL21-CondonPlus (DE3)-RIPL中的最佳表达条件为菌液浓度(OD600)0.5-0.7、温度为37℃、IPTG浓度0.5mM、诱导时间4-6h;鉴定发现pET32a (+)-nhepcidin在BL21-CodonPlus(DE3)-RIPL表达菌株中为可溶表达重组蛋白。
     本试验首次成功构建了黄鳝肠道未剪切cDNA文库,发现了许多与肠道营养代谢和抗病相关的EST序列,为黄鳝肠道功能基因的研究奠定了分子基础;黄鳝肠道中抗菌肽hepcidin的发现不仅为黄鳝功能基因研究拓宽了道路,而且对开发用于黄鳝养殖的新型抗病药物提供了重要的候选物和参考依据。获得的研究资料将为后续研究打下基础。
The freshwater eel, Monopterus albus, is widely distributed throughout the world. In recent years it has become commercially important, resulting in the establishment of several facilities to culture this species in China. With the development of intensive aquaculture, several diseases, caused by bacteria, viruses and parasites, have emerged. We constructed an expressed sequence tag (EST) library (Uncut) to identify genes associated with nutrient metabolism and immunity in the intestine of M. albus, a commercially valuable species. Then preliminary study on M. albus hepcidin expression in prokaryotic expression vector.
     Our objective was to identify nutrient metabolism and immunity-related genes in M. albus. We constructed a cDNA library from the intestinal tissue of M. albus. The library capacity reaches 1.46×107, the percentage of recombination is as high as 96.88%. PCR results showed that the average size of inserts was 2.11Kb. We sequenced 1056 randomly selected clones from the cDNA library. We obtained 906 high quality ESTs (GenBank accession number:GW584265-GW585168) with an average length 812 bp after trimming the vector sequence and eliminating low quality sequences. The ESTs were assembled into 61 contigs with an average length of 1057 bp, leaving 701 singletons. In total, we identified 762 unique sequences.Several (523 of 762) of the unique sequences had shared significant homology (BLASTX, score> 80, e-values<10-10) with known genes. We identified 59 species putative nutrition-related genes based on their functional classification in the Gene Ontology database. A number (73) of the unique sequences (including 8 contigs and 65 singlets) were related to immune function. We identified immunity-related genes that coded for chitinase, ferritin, MHC II, Hsp 70, HSP90, lectin, complement components, lysozyme, transferrin, glutathione peroxidase, serine protease inhibitor, and immunoglobulin. Eosinophil chemotactic cytokine (ECC) is a member of the chitinase family of proteins. Ours is the first report of this cytokine in teleosts.This study provides a basis for the development of the innate and adaptive immune systems in M. albus.
     Application of PCR technology to screen out hepcidin (GenBank accession number: GU997139) antimicrobial peptide gene from the library. Bioinformatics analysis software, on the selection of the antimicrobial peptide hepcidin gene was sequenced, found that including a 273bp ORF region encoding 90 amino acid residues of the peptide. Further analysis of antimicrobial peptide protein sequence contains a signal peptide of 24 amino acids and pro-region part of 40 amino acids before the mature peptide of 26 amino acids, class of antimicrobial peptide hepcidin contains eight cysteine typical structure, the formation of four pairs of disulfide key; structure prediction shows that it belongs to P-sheet type peptide. Homologous than are found with a variety of animals, M. albus hepcidin sequences are highly homologous with the similarity of Larimichthys crocea croaker up to 81%.
     Using genetic engineering techniques, preliminary study on M. albus hepcidin expression in prokaryotic expression vector. We constructed a direct expression vector pET22b (+) found that M. albus hepcidin peptide can not directly expression in pET22b (+), prove that this peptide with bactericidal activity. Then pET43.1a (+) construction of hepcidin fusion expression vector was transformed into BL21 (DE3) pLysS, BL21Star (DE3) pLysS and BL21-CondonPlus (DE3)-RIPL strain of three expression was induced and expressed recombinant protein had no significant expression. In pET32a (+) vector were constructed encoding full sequence of hepcidin (pET32a (+)-hepcidin) and no signal peptide sequence (pET32a (+)-nhepcidin) recombinant plasmid was transformed into BL21 (DE3) pLysS, BL21Star (DE3) pLysS, BL21-CondonPlus (DE3)-RIPL expression of three different strains induced for expression, found to contain a signal peptide of pET32a (+) -hepcidin fusion protein in three kinds of strains are not normal expression, while no signal peptide of pET32a (+)-nhepcidin recombinant protein can be highly expressed in BL21-CondonPlus (DE3)-RIPL. Induced by optimizing the conditions to obtain pET32a (+)-nhepcidin recombinant protein in BL21-CondonPlus (DE3)-RIPL in the best conditions for the expression of bacterial concentration (OD600) 0.5~0.7, temperature 37℃, IPTG concentration of 0.5mM, the induction time 4~6h. Identification found pET32a (+)-nhepcidin recombinant protein expressed in BL21-CodonPlus (DE3)-RIPL strain for soluble expression.
     We successfully constructed cDNA library (uncut) from the intestinal tissue of M. albus and found a lot of nutrition metabolism and disease resistance-related EST sequences. Antimicrobial peptide hepcidin from the intestinal tissue was found not only functional gene of M. albus widening the road, but also the development of new disease for aquaculture provides an important candidate drugs and reference materials. Our study provides a basis for the identification of genetic variation among immune related genes and their relationship to disease resistance phenotypes.
引文
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