Expression of recombinant Thermomonospora fusca xylanase A in Pichia pastoris and xylooligosaccharides released from xylans by it

文献类型: 外文期刊

第一作者: Sun, Jian-Yi

作者: Sun, Jian-Yi;Liu, Ming-Qi;Weng, Xiao-Yan;Qian, Li-Chun;Gu, Sai-Hong

作者机构:

关键词: Thermomonospora fusca xylanase A (TfxA);expression;hydrolysis;xylooligosaccharides;HPLC

期刊名称:FOOD CHEMISTRY ( 影响因子:7.514; 五年影响因子:7.516 )

ISSN: 0308-8146

年卷期: 2007 年 104 卷 3 期

页码:

收录情况: SCI

摘要: The mature peptide of Thermonionospora fusca xylanase A (TfxA) was successfully expressed in Pichia pastoris under the control of AOXI promoter. The activity of recombinant T fusca xylanase A (reTfxA) in culture supernatant was 117.3 +/- 2.4 U/mg, which is 3 times higher than that of the native TfxA. The optimal temperature and pH for reTfxA were 60 degrees C and 6.0, respectively. When treated at 70 degrees C and pH 6.0 for 2 min, the residual activity of the reTfxA was 70%. The reTfxA was very stable over a wide pH range (5.0-9.0). After incubation over pH 5.0-9.0 at 25 degrees C for I h, all the residual activity of reTfxA was over 80%. The K(m) and k(cat) values for reTfxA were 2.45 mg/ml and 139 s(-1) respectively. HPLC analysis revealed that xylobiose (X2) was the main hydrolysis product released from birchwood xylan and wheat bran insoluble xylan by reTfxA. Hydrolysis results of xylooligosaccharides showed that reTfxA was an endoacting xylanase and xylobiose, xylotriose (X3), xylotetraose (X4), xylopentaose (X5), and xylohexaose (X6) could be hydrolysed. This is the first report on the expression of reTfxA in yeast and on the determining and quantifying of the hydrolysis products released from xylans and xylooligosaccharides by reTfxA. (c) 2007 Elsevier Ltd. All rights reserved.

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