期刊
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
卷 175, 期 2, 页码 925-936出版社
HUMANA PRESS INC
DOI: 10.1007/s12010-014-1344-x
关键词
Glycosyl hydrolase family 11; Cold-active xylanase; N-terminal deletion; Thermostability
资金
- National Natural Science Foundation of China [31201829]
- National High-Tech Researchand Development Program (863 Program) [2012AA022208]
- National 948 Project [2014-S1]
In the present study, we first reported a cold-active xylanase of glycosyl hydrolase family 11, Xyn11, from the filamentous fungus Bispora antennata. The coding gene (xyn11) was cloned and successfully expressed in Pichia pastoris. Deduced Xyn11 exhibited the highest identity of 65 % with a family 11 endo-beta-1,4-xylanase from Alternaria sp. HB186. Recombinant Xyn11 exhibited maximal activity at 35 A degrees C and remained 21 % of the activity at 0 A degrees C. Sequence alignment showed that the N-terminal sequence of Xyn11 is distinct from those of thermophilic xylanases of family 11. To determine its effect on enzyme properties, the Xyn11 mutant without the N-terminal sequence, t-Xyn11, was then constructed, expressed in P. pastoris, and compared with Xyn11. Both enzymes showed optimal activities at 35 A degrees C and pH 5.5 and were stable at pH 2.0-12.0. Compared with truncated mutant t-Xyn11, Xyn11 retained more activity after 20-min incubation at 40 A degrees C (Xyn11:28 % vs. t-Xyn11:4 %) and degraded xylan substrates more completely. Thus, a new factor affecting the thermostability of cold-active xylanase of family 11 was identified.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据