Abstract:
:T. reesei is an efficient cellulase producer and biomass degrader. To improve xylitol production in Trichoderma reesei strains by genetic engineering, two approaches were used in this study. First, the presumptive D-xylulokinase gene in T. reesei (xyiH), which has high homology to known fungi D-xylulokinase genes, was silenced by transformation of T. reesei QM9414 strain with an antisense construct to create strain S6-2-2. The expression of the xyiH gene in the transformed strain S6-2-2 decreased at the mRNA level, and D-xylulokinase activity decreased after 48 h of incubation. This led to an increase in xylitol production from undetectable levels in wild-type T. reesei QM9414 to 8.6 mM in S6-2-2. The T. reesei Δxdh is a xylose dehydrogenase knockout strain with increased xylitol production compared to the wild-type T. reesei QM9414 (22.8 mM versus undetectable). The copy number of the xylose reductase gene (xyl1) in T. reesei Δxdh strain was increased by genetic engineering to create a new strain Δ9-5-1. The Δ9-5-1 strain showed a higher xyl1 expression and a higher yield of xylose reductase, and xylitol production was increased from 22.8 mM to 24.8 mM. Two novel strains S6-2-2 and Δ9-5-1 are capable of producing higher yields of xylitol. T. reesei has great potential in the industrial production of xylitol.
journal_name
Biomed Res Intjournal_title
BioMed research internationalauthors
Hong Y,Dashtban M,Kepka G,Chen S,Qin Wdoi
10.1155/2014/169705subject
Has Abstractpub_date
2014-01-01 00:00:00pages
169705eissn
2314-6133issn
2314-6141journal_volume
2014pub_type
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journal_title:BioMed research international
pub_type: 临床试验,杂志文章,多中心研究
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更新日期:2018-09-30 00:00:00
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journal_title:BioMed research international
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pub_type: 已发布勘误
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pub_type: 临床试验,杂志文章
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更新日期:2013-01-01 00:00:00
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更新日期:2018-07-18 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章,随机对照试验
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pub_type: 杂志文章,多中心研究
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
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更新日期:2015-01-01 00:00:00