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- W3048320826 abstract "To better understand the roles of genes involved in mannan degradation in filamentous fungi, in this study we searched, identified, and characterized one putative GH5 endo-β-mannanase (GH5-7) and two putative GH2 mannan-degrading enzymes (GH2-1 and GH2-4) in Neurospora crassa. Real-time RT-PCR analyses showed that the expression levels of these genes were significantly up-regulated when the cells were grown in mannan-containing media where the induction level of gh5-7 was the highest. All three proteins were heterologously expressed and purified. GH5-7 displayed a substrate preference toward galactomannan by showing 10-times higher catalytic efficiency than to linear β-mannan. In contrast, GH2-1 preferred short manno-oligosaccharides or β-mannan as substrates. Compared to the wild type strain, the growth of Δgh5-7 and Δgh5-7Δgh2-4 mutants, but not Δgh2-1, Δgh2-4, and Δgh2-1Δgh2-4 mutants, was poor in the cultures containing glucomannan or galactomannan as the sole carbon source, suggesting that GH5-7 plays a critical role in the utilization of heteromannans in vivo. On the other hand, all the mutants showed significantly slow growth when grown in the medium containing linear β-mannan. Collectively, these results indicate that N. crassa can utilize glucomannan and galactomannan without GH2-1 and GH2-4, but efficient degradation of β-mannan requires a concerted action of three enzymes, GH5-7, GH2-1, and GH2-4." @default.
- W3048320826 created "2020-08-13" @default.
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- W3048320826 date "2020-11-01" @default.
- W3048320826 modified "2023-10-16" @default.
- W3048320826 title "In vitro and in vivo characterization of genes involved in mannan degradation in Neurospora crassa" @default.
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- W3048320826 doi "https://doi.org/10.1016/j.fgb.2020.103441" @default.
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