摘要
α-半乳糖苷酶(α-D-galactosidase,α-Gal,EC 3.2.1.22)是一种外切糖苷酶,广泛存在于生物界中。不同来源的α-Gal分子量介于28000~370000之间,有单体、二聚体、三聚体与四聚体形式。由于某些来源的α-Gal具有血型转换的特殊功能,对该酶的研究越来越多,从咖啡来源的α-Gal在血型转换方面的效果表现最好,目前,采用生物工程手段进行研究已开始为科枝界所关注。编码小粒种咖啡(Coffea arabica)α-Gal的cDNA约为1384bp,编码377个氨基酸,而成熟肽编码区的cDNA约为1089bp,编码363个氨基酸。
本研究分离克隆了大粒种咖啡(Coffea liberica)与中粒种咖啡(Coffea canephora)的α-Gal成熟肽编码区的cDNA,而后利用二种微生物表达系统进行重组发酵表达的研究,研究结果如下:
1.利用试剂盒的改进方法,简便、快捷而有效地提取到质量良好的热带作物咖啡的总RNA,全过程仅需2h。
2.首次从大粒种咖啡(C.liberica)与中粒种咖啡(C.canephora)中,克降到α-Gal cDNA的成熟肽编码区α-Gal-D cDNA和α-Gal-2 cDNA。克隆到的α-Gal-DcDNA编码区为1089bp,与已发表的小粒种咖啡成熟肽编码序列1080bp有98.7%同源性,共有14处碱基发生变化,氨基酸发生突变的布8个;克隆到的α-Gal-Z cDNA编码区也为1089bp,与已发表的小粒种咖啡成熟肽编码序列1089bp有99.27%同源性,共有8处碱基发生变化,氨基酸发生突变的有4个。
3.将克隆到的大粒种与中粒种咖啡的α-Gal基因,用巴斯德毕赤氏酵母Pichia pastoris表达载体pPICZαA(分泌甲醇诱导型)和pGAPZαA(分泌组成型),成功地构建了4个酵母表达载体:pPICZαA/Gal-Z,pPICZαA/Gal-D,pGAPZαA/Gal-Z,pGAPZαA/Gal-D。
4.将克隆到的大粒种咖啡的α-Gal基因,用大肠杆菌Escherichia cali的分泌型表达载体pET-22b(+),成功地构建了1个大肠杆菌表达载体:pET-22/Gal-D。
5.对重组P.pastoris工程菌pPICZαA/Gal-D/GS115、pPICZαA/Gal-Z/GS115、pGAPZαA/Gal-D/GS115进行了摇瓶发酵表达,对发酵产物进行了SDS-PAGE电泳,得到一条约为40KD的主条带,确认了rα-Gal-D与rα-Gal-Z均得到了表达;并对表达产物进行了酶活性检测,结果证明了rα-Gal-D与rα-Gal-Z均具有活性。
6.附消卜积的把)院发酵采用甲醇诱导到我休p卜1*Z。。A叫,分泌发达的r。-
Gal-D的酶活在481。时为 19.11(U/Inl)高于ro-Gal-Z在48llDI;J为 15.93([J/Inl),
蛋一质分泌品却是 r。-Ga1Z为 692.5(mg/卜)高下 r ala卜D为 504.5(lllg/卜)。说
明咖,仰不同种来源的。-G。1共同在同一表达载体中,表达员有差异:八分泌表达中,
蛋白质分泌最高,酶活不一定就高,二者不成Ill比。实验中对r。。刀。卜D酶活检测
在 108 11时,其活性可高达 48.22(U/1ill),而 IO-GOIL则为 18.18(U/:11I)。
7.同一个咖l咋种来源的a-Gal基冈,在不同的表达政体中表达乌山有差异,甲
醇诱导刊载体 pP!CZ O A优下组成刑载体 pGAPZ。A。
8.对产paslorj,1程苗pPICZ。A/GalD/GS]15讲行J十发阶规发附表达,对
发酵产’物进行了S*巳*AOE丁匕泳,得到一条约为40KD的条带,确认了r a刁a卜D
得到了表达;并对产物进行酶活性检测,证明了 r a-Gal-D只有酶活性。
9.对Ecoli工程菌PET、22/GalD/BL21进行了摇瓶发酵表达,对发酵产物进行
了SDS-PAGE电泳,目的条带区分不明显:并对发酵产物进行了酶活性检测,只有
做最酶活性,说明该表达载体与宿主菌可能不适于。一日。卜D基闭的表达。
a-D-galactosidase ( a-Gal, R. C. 3. 2. 1. 22 ) i s an exo-glycosidaso, widely present in the bio-resources. The enzyme isolated from coffee beans has been well characterized and it has high activity in hydrolyzing the terminal a -Gal residues from glycoconjugates on human blood group B erythrocytes to demonstrate group 0 serotype. a -Gal from coffee bean has been successf u 11 y used i n the serologicl conversion of red blood cells in clinical studies of blood transfusion. The molecular weight of different sources of a-Gal is between 28 000-370 000, and the molecular weight of a-Gal from coffee bean(Coffea arabicd) is 41 000. The whole Tenth cDNA of a -Gal from coffee bean(C. arabicd) is 1384bp and that of the mat peptides cDNA is 1089bp.
The results of this study are as follows:
l.A Simple, fast, and efficiency method for extracting of total RNA from coffee bean has been used by RNA extracting Kit which were improved in this paper.
2. Two mat_peptides cDNA encoding n -Gal have been cloned by RT-PCR from coffee bean ( C. liberica & C. canephora ) . The mat_peptidcs cDNA are 1089bp, encoded 364 amino acid(AA). The cDNA from C. liberica is 98.7% homologous to the published C. arabica sequence. It has been found that 14bp of DNA sequence or 8 AA of protein sequence were changed. The cDNA of u -Gal gene from C. canephora is 99.27% homologous to the published C. arabica sequence,while 8bp of DNA sequence or 4 AA of protein sequence were changed.
3. Four expression vectors, pPICZ a A/Gal-Z, pPICZ a A/Ga1-D, pGAPZ a A/Gal-Z, pGAPZ a A/Gal-D have been constructed successfully with the a-Gal gene from coffee bean and the vectors, pPICZ a A and pGAPZ a of Pichia pasloris.
4. One Excherichia coli expression vector, pFT-22/Gal-D has been constructed with the a -Gal gene isolated from C. liberica and the E coli secretion vector pET-22b ( + ) .
5. The three constructed vectors pPICZ a A/Gal-Z, pPICZa A/Gal-D, pGAPZ a A/Gal-D were transferred into P. pastoris stain GS115. The shake-flask expression with recombinant strain of P. pastoris, pPICZ a A/Gal-Z/GS115, pPICZ a A/Gal-D/GS115, pGAPZ a A/Gal-D/GSl15; the fermentation expression with recombinant strain of P. pastoris , pPICZ a A/Gal-D/GSl15 have been made. The products of shake-flask and fermentation expression showed a main band of 40KD on SDS-PAGE.
6. The enzyme assay showed the high enzyme activity of r a -galactosidase when using pPICZ a A vector.The enzyme activity from C. liberica was 19.11 (U/ml)at 48 h and up to 48.22( U/ml )at 108 h. the en/yme activity from C. cancphora was 15.93 (U/ml) at 48 h and up to 18.18 (U/ml) at 108 h.
7. There were some differences between the r a -Gal quantities of expression with different vectors, the methanol inducing vector, pPICZ a A was better than that of the constitute vector pGAPZ a A.
8. The constructed vector pPICZa A/Gal-D has been transferred into P. pastoris stain GS115, followed by fermentation, a single protein band of 40 KD showed on SDS-PAGE. The enzyme assay showed the activity of a -galactosidase.
9. The constructed vector pET-22/Gal-D was transferred into E. coli stain DL21(DE3)pLysS, followed by shake-flask expression. There was not obviously objective protein band has been seen on SDS-PAGE. The enzyme assay showed a light activity of a -Gal. The result showed that the a -Gal gene was not well expression in this expression system.
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