A novel thermoacidophilic family 10 xylanase from Penicillium pinophilum C1

文献类型: 外文期刊

第一作者: Cai, Hongying

作者: Cai, Hongying;Shi, Pengjun;Bai, Yingguo;Huang, Huoqing;Yuan, Tiezheng;Yang, Peilong;Luo, Huiying;Meng, Kun;Yao, Bin

作者机构:

关键词: Penicillium pinophilum C1;Xylanase;Thermoacidophilic;Pichia pastoris;Malting and brewing

期刊名称:PROCESS BIOCHEMISTRY ( 影响因子:3.757; 五年影响因子:3.665 )

ISSN: 1359-5113

年卷期: 2011 年 46 卷 12 期

页码:

收录情况: SCI

摘要: A novel endo-beta-1,4-xylanase gene (xyn10C1) was cloned from Penicillium pinophilum C1 and overexpressed in Pichia pastoris. The 1071-bp full-length gene encodes a 356-residue polypeptide containing the catalytic domain of glycoside hydrolase 10. Deduced XYN10C1 shares highest amino acid sequence identity of 49.3% with a putative xylanase from Glomeella graminicola M1.001. Purified recombinant XYN10C1 showed maximal activity at pH 4.0-5.5 and 75 degrees C, exhibited good adaptability to broad acidic pH and temperature ranges (>69.0% activity at pH 2.5-6.5; and >91.0% activity at 70-80 degrees C and 22.2% even at 90 degrees C), and was highly stable at pH 2.0-7.0 for 1 h at 37 degrees C. The specific activity, K-m and V-max values for birchwood xylan and soluble wheat arabinoxylan were 100.7 and 137.4 U/mg, 4.3 and 6.9 mg/ml, and 195.4 and 209.3 mu mol/min/mg, respectively. The enzyme was strongly resistant to most metal ions and proteases (pepsin and trypsin). Under simulated mashing conditions, addition of XYN10C1 (80 U) to the brewery mash (12.5 g in 50 ml system) significantly increased the filtration rate by 26.7% and reduced the viscosity by 9.8%, respectively. All these favorable enzymatic properties make XYN10C1 attractive for potential applications in the food and animal feed industries. (C) 2011 Elsevier Ltd. All rights reserved.

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