海藻酸裂解酶基因在毕赤酵母中的表达及重组酶性质的初步研究
Secreted expression of Azotobacter chroococcum alginate lyase gene(algL) in Pichia pastoris and primary analysis of enzymic properties
-
摘要: 褐球固氮菌(Azotobacter chroococcum)是一种海藻酸降解菌.本实验采用PCR的方法,以褐球固氮菌基因组DNA为模板,克隆出约1.05 kb的海藻酸裂解酶基因algL的成熟蛋白编码序列,并将其插入巴斯德毕赤酵母(Pichia pastoris)表达载体pPIC9K中,获得重组质粒pPIC9K-algL.重组质粒线性化后用聚乙二醇(PEG)法导入毕赤酵母菌株GS115中,获得高效分泌表达海藻酸裂解酶的毕赤酵母工程菌株.用甲醇诱导培养基进行摇瓶发酵,表达得到43 kDa的目的蛋白,酶活力可达1 400 U/cm3左右.经测定,该重组酶的最适反应pH为8.5,最适反应温度为40℃,并且在20~55℃,pH2.0~11.0具有较好的稳定性.另外,10 mmol/cm3的Cu2+,Fe2+,Co2+,Mn2+和Ca2+对酶有不同程度的抑制作用.Abstract: An alginate lyase gene of Azotobacter chroococcum, called algL, has been cloned with PCR technique.The sequence encoding the mature peptide of alginate lyase of Azotobacter chroococcum was added with EcoRI and NotI.Then the gene was inserted into the Pichia pastoris vector pPIC9K and introduced into the host Pichia pastoris GS115 by PEG method.After screen, the recombinant Pichia pastoris strain was obtained and induced in 25mL methylot rophic culture medium.Expression of the algL gene in P.pastor is cells resulted in the expression of alginate lyase activity (1 400 U/cm3) and the appearance of a new protein of 43 kDa detected on SDS-PAGE.To characterize the recom binantenzyme, it was found that the optimum temperature is 40℃ at pH 8.5 and that activity of alginate lyase decreased rapidly when analyzed above 60℃.The activity of recom binant AlgL decreased by over 50% in the presence of 10 mmol/L Cu2+ or Fe2+, furthermore, 10mmol/L Co2+, Mn2+, Ca2+ or 1mmol/L Fe2+ decreased it by 20% respectively.Other cations including K+, Na+, Zn2+ did not affect significantly the enzymatic activity.
-
Key words:
- alginate lyase /
- Pichia pastoris /
- algao ligosaccharides /
- expression induced
-
黄知清,严兴洪.海藻研究开发的发展概述[J].海洋技术,2002,21(2):22-25. 邓富文.酶解技术用于马尾藻提取海藻酸工艺的研究[J].广西化工,1999,28(2):11-13. 海带营养丰富功能多[J].保鲜与加工,2002,3(3):39. 秦国奎,张玉忠,陈秀兰,等.海藻酸盐裂解酶研究进展[J].中国生物工程杂志,2004,24(2):26-33. ANA P,ALBERTO P,ANYONIO P.Cloning and Expression of the algL Gene,Encoding the Azotobacter chroococcum Alginate Lyase:Purification and Characterization of the Enzyme[J].J Bacteriol,1999,181(5):1409-1414. HENRY I N,PATRICIA C S.Alginic acid degradation by eliminases from abalone hepatopancreas[J].J Bio Chem,1967,242 (5):845-851. STEVEN R M,NEAL L S.Alginate Synthesis in Pseudomonasaeruginosa:the Role of AlgL (Alginate Lyase) and AlgX[J].J Bacteriol,1996,178(3):625-632. HAN Feng,GONG Qian-hong,SONG Kai,et al.Sequence Analysis and Expression of Gene AlyVI Encoding Alginate Lyase from Marine Bacterium Vibrio sp.QY101[J].DNA Sequence,2004:1-8. TOMOO S,MIWA O,YOSHIO E.Novel alginate lyases from marine bacterium Alteromonas sp.strain H-4[J].Carbohydr Res,1997,304:69-76. ERTESVAG H,ERLIEN F,SKJAK-BRAEK G,et al.Biochemical properties and substrate specificities of a recombinantly produced Azotobacter vinelandii alginate lyase[J].J Bacteriol,1998,180(15):3 779-3 784. SHIMIZU E,OJIMA T,NISHITA K.cDNA cloning of an alginate lyase from abalone,Haliotis discus hannai[J].Carbohydr Res,2003,338(24):2 841-2 852. MADGWICK J,HAUG A,LARSEN B.Alginate lyase in the brown alga Laminaria digitata (Huds.) Lamour[J].Acta Chem Scand,1973,27(2):711-712. 刘万顺,李濒.海洋无脊椎动物消化酶的研究Ⅰ:紫贻贝、日本鲟、滨螺消化酶的初步分析和应用[J].山东海洋学院学报,1988,18(1):54-57. 萨姆布鲁克 J,拉塞尔 D W(黄培堂,等译).分子克隆实验指南上、下册[M].北京:科学出版社,2002.1949. 袁兆慧,韩丽君,林伟,等.褐藻酸降解酶的制备及其性质研究[J].海洋科学,2005,29(2):78-80. 马歇克 D R,门永J T,布格斯R R,等(朱厚础,等译).蛋白质纯化与鉴定实验指南[M].北京,科学出版社,1999.279. 刘岩,江晓路,管华诗.褐藻胶裂解酶研究进展[J].中国水产科学,2001,7(4):99-103. HONG F,MEINANDER N Q,JONSSON L J.Fermentation strategies for improved heterologous expression of laccase in Pichia pastoris[J].Biotechnol Bioeng,2002,79 (4):438-449. SREEKRISHNA K,BRANKAMP R G.Strategies for optimal synthesis and secretion of heterologous proteins in the methylotrophicy yeast Pichia pasroris[J].Gene,1997,190 (1):55-62. NAKADA H I,SWEENY P C.Alginic acid degradation by eliminases from abalone hepatopancreas[J].Biol Chem,1967,242:845-851. favorov vv,vozhova ei,denisenko va,et al.A study of reaction catalysed by alginate lyase Ⅵ from the sea molluse,Littorina sp.[J].Biochim Biophys Acta,1979,569:259-266. SHIRAIWA Y,ABE K,SASAKI S F,et al.Alginate lyase activities in the extracts from several brown algae[J].Bot Mar,1975,18:97-104. BROWN B J,PRESTON J F Ⅲ.L-Guluronan-specific alginate lyase from a marine bacterium associated with Sargassum[J].Carbohydr Res,1991,211:91-102. 孙忠保,阎宏,马永军.寡糖在动物生产中的应用[J].宁夏农学院学报,2004,25(4):80-84. 柴栋,王睿.藻酸盐裂解酶对粘液型铜绿假单胞菌生物被膜的影响[J].国外医药抗生素分册,2001,22(4):172-175. EFTEKHAR F,SPEERT D P.Alginase Treatment of Mucoid Pseudomonas aeruginosa Enhances Phagocytosis by Human MonocyteDerived Macrophages[J].Infect Immun,1988,56(11):2 788-2 793. TOMOO S,YOSHIO E,TAKAHISA K.Application of an alginate lyase from Alteromonas sp.for isolation of protoplasts from a brown algae L ami naris japonica[J].Nippon Suisan Gakkaishi,1993,59 (4):705-709.
点击查看大图
计量
- 文章访问数: 782
- HTML全文浏览量: 3
- PDF下载量: 1112
- 被引次数: 0