Production of Recombinant Trichoderma reesei Cellobiohydrolase II in a New Expression System Based on Wickerhamomyces anomalus.

Q2 Biochemistry, Genetics and Molecular Biology
Enzyme Research Pub Date : 2017-01-01 Epub Date: 2017-08-30 DOI:10.1155/2017/6980565
Dennis J Díaz-Rincón, Ivonne Duque, Erika Osorio, Alexander Rodríguez-López, Angela Espejo-Mojica, Claudia M Parra-Giraldo, Raúl A Poutou-Piñales, Carlos J Alméciga-Díaz, Balkys Quevedo-Hidalgo
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引用次数: 7

Abstract

Cellulase is a family of at least three groups of enzymes that participate in the sequential hydrolysis of cellulose. Recombinant expression of cellulases might allow reducing their production times and increasing the low proteins concentrations obtained with filamentous fungi. In this study, we describe the production of Trichoderma reesei cellobiohydrolase II (CBHII) in a native strain of Wickerhamomyces anomalus. Recombinant CBHII was expressed in W. anomalus 54-A reaching enzyme activity values of up to 14.5 U L-1. The enzyme extract showed optimum pH and temperature of 5.0-6.0 and 40°C, respectively. Enzyme kinetic parameters (KM of 2.73 mM and Vmax of 23.1 µM min-1) were between the ranges of values reported for other CBHII enzymes. Finally, the results showed that an enzymatic extract of W. anomalus 54-A carrying the recombinant T. reesei CBHII allows production of reducing sugars similar to that of a crude extract from cellulolytic fungi. These results show the first report on the use of W. anomalus as a host to produce recombinant proteins. In addition, recombinant T. reesei CBHII enzyme could potentially be used in the degradation of lignocellulosic residues to produce bioethanol, based on its pH and temperature activity profile.

Abstract Image

Abstract Image

Abstract Image

重组里氏木霉纤维生物水解酶ⅱ的新表达体系构建
纤维素酶是一个至少由三组酶组成的家族,它们参与纤维素的连续水解。重组表达纤维素酶可以减少它们的生产时间,提高丝状真菌获得的低蛋白浓度。在这项研究中,我们描述了里氏木霉纤维生物水解酶II (CBHII)的生产在一个本地菌株威氏木霉异常。重组CBHII在W. anomalus 54-A中表达,酶活值高达14.5 U L-1。酶提物的最佳pH为5.0 ~ 6.0℃,最佳温度为40℃。酶动力学参数(KM为2.73 mM, Vmax为23.1µM min-1)在其他CBHII酶的报道范围内。最后,结果表明,携带重组T. reesei CBHII的W. anomalus 54-A酶提取物可以产生类似于纤维素水解真菌粗提取物的还原糖。这些结果是首次报道利用反常W.作为宿主生产重组蛋白。此外,基于其pH值和温度活性谱,重组T. reesei CBHII酶可能用于降解木质纤维素残基以生产生物乙醇。
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来源期刊
Enzyme Research
Enzyme Research Biochemistry, Genetics and Molecular Biology-Biochemistry
CiteScore
4.60
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