The feruloyl esterase from Thermobacillus xylanilyticus shows broad specificity for processing pre-biotic feruloylated xylooligosaccharides at high temperatures.

The feruloyl esterase from Thermobacillus xylanilyticus shows broad specificity for processing pre-biotic feruloylated xylooligosaccharides at high temperatures.
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来自Thermobacillus xylanilyticus 的阿魏酰酯酶对于在高温下加工益生元阿魏酰化低聚木糖表现出广泛的特异性。

DOI:
10.1016/j.foodchem.2022.134939
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发表时间:
2023
期刊:
影响因子:
8.8
通讯作者:
Garbelotti CV
Garbelotti CV
中科院分区:
农林科学1区
文献类型:
--
作者:
Garbelotti CV

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阿魏酸具有食品工业感兴趣的抗氧化特性,并且可以使用阿魏酸酯酶从天然植物纤维中释放。在高温下有活性的酯酶是非常需要的,但目前代表性不足。本文报道了嗜热杆菌阿魏酸酯酶的生化特性。重组Tx-Est 1与阿魏酸乙酯的比活性为29.2 ± 2.9 U mg−1,催化效率(Kcat/Km)为393.7 ± 9.8 s-1 mM −1。最适温度和pH为60 °C和7.5,其中Tx-Est 1在40 °C下25小时后保留70%活性。MALDI-TOF MS显示Tx-ESTI从DP 4-DP 13的低聚木糖和含有两个阿魏酸基团的DP 6 -8中释放阿魏酸。高效液相色谱表明,阿魏酸从脱淀粉麦麸释放强烈增强与木聚糖酶共孵育。这些特性,特别是在高温下的高活性,表明Tx-Est 1可用于从农业废物或植物多糖糖化过程中生产高价值化合物。
Ferulic acid has antioxidant properties of interest to the food industry and can be released from natural plant fibres using feruloyl esterases. Esterases active at high temperatures are highly desirable but currently underrepresented. Here we report the biochemical characterization of the feruloyl esterase fromThermobacillus xylanilyticus. Specific activity of recombinant Tx-Est1 with ethyl ferulate was 29.2 ± 2.9 U mg−1, with a catalytic efficiency (Kcat/Km) of 393.7 ± 9.8 s-1mM−1. The temperature and pH optima were 60 °C and 7.5, whereby Tx-Est1 retains 70% activity after 25 h at 40 °C. MALDI-TOF MS revealed Tx-ESTI released ferulic acid from xylooligosaccharides with DP4-DP13, and from DP6-8 containing two ferulic acid groups. HPLC demonstrated ferulic acid release from destarched wheat bran was strongly potentiated by co-incubation with xylanase. These properties, especially the high activity at elevated temperatures, suggest Tx-Est1 can be employed for production of high-value compounds from agricultural waste or during plant polysaccharide saccharification.
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