期刊
ANIMAL FEED SCIENCE AND TECHNOLOGY
卷 208, 期 -, 页码 44-52出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.anifeedsci.2015.07.002
关键词
Ruminal fermentation; Microbial population; Xylanase; Yeast surface display
资金
- Innovation Team Program of Zhejiang Province [2011R50025]
This study aimed to develop a yeast strain that surface displays a xylanase that was found from a rumen fosmid library and optimized by directed evolution (Orf6-un(m)). The Orf6-un(m) enzyme was successfully surface-displayed using Saccharomyces cerevisiae EBY100 as host (referred to as EBY100-pYD1-orf6-un(m)), yielding a specific xylanase activity of 137 U/g dry cells. The EBY100-pYD1-orf6-un(m) had greater xylanolytic activity and produced more xylose from beechwood xylan than the purified Orf6-un(m) overexpressed in Escherichia coli. The EBY100-pYD1-orf6-un(m) was evaluated for its effect on digestion of corn stover by in vitro rumen cultures. Both EBY100 and EBY100-pYD1-orf6-un(m) increased volatile fatty acid production, dry matter degradation, and total bacteria population, while shortening the lag time of gas production. However, EBY100-pYD1-orf6-un(m) increased both gas production and dry matter degradation, and shortened the lag time to greater magnitudes than EBY100. EBY100-pYD1-orf6-un(m) may be used to deliver both xylanase and live yeast to feed animals. (C) 2015 Elsevier B.V. All rights reserved.
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