摘要
为了解决目前大黄鱼(Pseudosciaena crocea,pc)等名贵经济鱼类在养殖
中存在的养殖周期长,饵料利用率低,养殖生产成本较高的问题,急需开发鱼类
本身的基因产物以改良鱼类养殖饲料。鱼类生长激素(growth hormone,GH)是
鱼类脑垂体细胞分泌的多肽激素,具有增强食欲、提高饲料转化率的作用。天然
鱼 GH 含量极低,分离纯化成本较高。基因工程技术为生产大量低成本的鱼生长
激素创造了条件,且实验证明重组鱼 GH 具有天然鱼 GH 的功能,却不会对人体产
生激素副作用。因此,生产基因重组大黄鱼 GH 在养殖领域具有重要的应用价值。
本论文分析了最新克隆的 pcGH 基因的特征,成功实现了 pcGH 在大肠杆菌中
的胞内表达和周质表达,并进一步探讨了影响 pcGH 在大肠杆菌中表达水平的各
种因素。
通过与数据库中同类蛋白序列的比较,发现最新克隆的 pcGH 分别在不同位
置与数据库中的 pcGH 及黑斑红鲈(Sciaenops ocellata)GH 有高度同源性,推
断这个 pcGH 基因来源于多个近源鱼种的杂交体。这一发现将有助于进一步研究
分析鱼类 GH 的活性部位及其突变对鱼类生长的影响。
通过 PCR 引物设计,在 pcGH 基因两端引入两个酶切位点,将其插入到大肠
杆菌表达载体 pET-22b(+)中,构建胞内表达质粒 pG2。将 pG2 转化大肠杆菌
BL21(DE3)和 Rosetta(DE3)。SDS-PAGE 分析发现,pG2/Rosetta(DE3)在诱导后对
应于 pcGH 分子量的位置有特异蛋白带随时间增浓,但在 pG2/BL21(DE3)中该位
置蛋白带浓度变化不明显。说明了 Rosetta(DE3)菌株有助于改善 pcGH 中大肠杆
菌稀有密码子对表达水平的影响。pcGH2/Roseta(DE3)的表达产物为可溶性蛋白;
该产物用硫酸铵分级沉降和阳离子交换层析分离纯化,达到电泳纯。
通过酶切位点的选择,使 pcGH 基因插入 pET-22b(+)载体上 pel B 分泌肽编
码序列的下游,构建成功周质表达质粒 pG3;将 pG3 转化大肠杆菌 Rosetta(DE3),
诱导表达后分离周质蛋白,发现部分重组蛋白在周质中表达。
本文还从转录水平和翻译水平系统、完整地探讨了影响 pcGH 在大肠杆菌中
表达水平的各种可能因素,分析了进一步提高重组大黄鱼 GH 的产量的可能方法。
这些工作对重组 pcGH 的生产和应用具有指导意义。
Problems such as low growth rate and low conversion rate of feedstuff exist in
the culturing of Pseudosciaena crocea and other economical marine fishes. Therefore,
it is economically important to exploit some genetic products of fish itself to improve
the properties of feedstuff. Fish growth hormone (fGH) is a polypeptide produced by
the pituitary cells of teleosts. It has the capacity to enhance the appetite and feed
conversion efficiency. However, the content of native fGH in pituitary is extremely
low and the expenditure of purification is too high. Fortunately, it is possible to
produce recombinant fGHs abundantly. And they have been proved in many cases the
same function as the native ones without any side effect to human. Therefore, it is
valuable to investigate the production of recombinant Pseudosciaena crocea GH
(pcGH).
In this research, the sequence of a newly cloned pcGH gene was analysed. Then
recombinant pcGH was produced both in intracellular and periplasmic manner. And
the factors effecting the expression level of the Escherichia coli were discussed.
The newly cloned pcGH showed high homogeneity to pcGH and Sciaenops
ocellata GH from GenBank in different regions respectively. Therefore this gene was
presumed to be the hybrid of several species of fish. This supposition will contribute
to find out the conserved regions of fGH. It'll also help to investigate the influence of
genetic mutation of GH on the growth of Pseudosciaena crocea.
The pcGH gene was cloned into pET-22b(+) for intracellular expression.
Recombinant plasmid (pG2) were transformed into E. coli BL21(DE3) and
Rosetta(DE3). SDS-PAGE analysis showed that a specific protein band with the same
molecular weight as theoretical one of pcGH was induced in pG2/Rosetta(DE3); but
in the case of pG2/BL21(DE3), this band was difficult to be found. Therefore, it’s
concluded that Rosetta(DE3) can help to lighten the effect of rare codon on the
expression level in E. coli. The product of pG2/Rosetta(DE3) was proved soluble,
then it was purified to be electrophoretically pure by ammonium sulfate precipitation
and cation exchange chromatography.
Another pair of primer was designed to insert the gene of pcGH into the
II
downstream of pel B signal peptide in pET-22b(+). The recombinant plasmid was
transformed into E. coli Rosetta(DE3). With IPTG induction, part of the recombinant
pGH was secreted into the periplasm of transformants.
Factors effecting the expression level of pcGH in E. coli, both on transcription
level and translation level, were discussed integrallty and systemically. Approches to
improve the expression level were put forward .
These works may have potential value in the production and application of
pcGH.
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