Enhanced production of thermostable laccases from a native strain of Pycnoporus sanguineus using central composite design  

中心组合设计方法提高血红密孔菌(Pycnoporus sanguineus)耐热漆酶的产量(英文)

作　　者：Leticia I. RAMíREZ-CAVAZOS Charles JUNGHANNS Rakesh NAIR Diana L. CáRDENAS-CHáVEZ Carlos HERNáNDEZ-LUNA Spiros N. AGATHOS Roberto PARRA 

机构地区：[1]Centro del Agua para América Latina y el Caribe,Tecnológico de Monterrey,Campus Monterrey,NL 64849,Mexico [2]Helmholtz Centre for Environmental Research-UFZ,Permoserstra?e 15,04318 Leipzig,Germany [3]Bioengineering Group,Earth and Life Institute,Université Catholique de Louvain,Place Croix du Sud,2,Box L7.05.19,1348 Louvain-la-Neuve,Belgium [4]Laboratorio de Enzimología,Facultad de Ciencias Biológicas,Universidad Autónoma de Nuevo León,Av. Universidad s/n,Ciudad Universitaria,San Nicolás de los Garza,NL 64450,Mexico

出　　处：《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》2014年第4期343-352,共10页浙江大学学报（英文版）B辑（生物医学与生物技术）

基　　金：supported by the National Science and Technology Council of Mexico(CONACYT)(No.192118)

摘　　要：The production of thermostable laccases from a native strain of the white-rot fungus Pycnoporus sanguineus isolated in Mexico was enhanced by testing different media and a combination of inducers including copper sulfate（CuSO4）.The best conditions obtained from screening experiments in shaken flasks using tomato juice,CuSO4,and soybean oil were integrated in an experimental design.Enhanced levels of tomato juice as the medium,CuSO4and soybean oil as inducers（36.8%（v/v）,3 mmol/L,and 1%（v/v）,respectively） were determined for 10 L stirred tank bioreactor runs.This combination resulted in laccase titer of 143000 IU/L（2,2＇-azino-bis（3-ethylbenzthiazoline-6- sulfonic acid）,pH 3.0）,which represents the highest activity so far reported for P.sanguineus in a 10-L fermentor.Other interesting media resulting from the screening included glucose-bactopeptone which increased laccase activity up to 20000 IU/L,whereas the inducers Acid Blue 62 and Reactive Blue 19 enhanced enzyme production in this medium 10 times.Based on a partial characterization,the laccases of this strain are especially promising in terms of thermostability（half-life of 6.1 h at 60 °C） and activity titers.研究目的:优化获得血红密孔菌(P.sanguineus)的最佳培养基组成,提高耐热漆酶的产量。创新要点:获得了目前文献报道的最高水平的漆酶活力。研究方法:通过单因素试验研究了不同培养基(番茄汁、麦麸、麦芽提取物和葡萄糖细菌蛋白胨培养基)和不同组合诱导剂(大豆油、阿魏酸、没食子酸、二甲基苯胺、酸性蓝62和活性蓝19分别与硫酸铜组合诱导剂)对P.sanguineus产耐热漆酶的影响。在此基础上采用中心组合试验设计,进一步研究了番茄汁培养基结合硫酸铜和大豆油组合诱导剂对P.sanguineus产耐热漆酶的影响。利用SAS10.0和响应面分析方法对试验结果进行了统计分析和建立回归模型。重要结论:通过中心组合设计优化得出P.sanguineus产耐热漆酶的最优培养基条件:以36.8%番茄汁为培养基,以3 mmol/L硫酸铜和1%大豆油作为组合诱导剂。该条件下在10 L搅拌槽生物反应器中漆酶活力达到了143 000 IU/L(2,2'-联氮双(3-乙基苯并噻唑啉-6-磺酸)为底物,pH值为3.0)。

关 键 词：Enhanced laccase production Central composite design Screening media INDUCERS Tomato juice medium Soybean oil Copper sulfate 

分 类 号：Q936[生物学—微生物学]