Abstract
The hydrolytic properties of a hybrid xylanase (ATx) and its parents (reAnxA and reTfxA) were studied using xylans and xylooligosaccharides as substrates. Analysis of reaction mixtures by high-performance liquid chromatograph revealed that xylotriose (X3) was the main product released from birchwood xylan and wheat bran insoluble xylan by ATx and reAnxA, respectively. Xylobiose (X2) was the main product separately released from birchwood xylan and wheat bran insoluble xylan by reTfxA. Xylotetraose (X4), xylopentaose (X5), and xylohexaose (X6) could be hydrolyzed by ATx, which showed no activity on X2 and X3. Therefore, X4 might be the minimum oligomer hydrolyzed by ATx. X2–X6 could be hydrolyzed by reAnxA and reTfxA, respectively. All of ATx, reAnxA, and reTfxA showed transglycosylation activity.
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Abbreviations
- ATx:
-
a hybrid xylanase whose parents are Thermomonospora fusca xylanase A and Aspergillus niger xylanase A
- HPLC:
-
high-performance liquid chromatography
- X:
-
xylose
- X2:
-
xylobiose
- X3:
-
xylotriose
- X4:
-
xylotetraose
- X5:
-
xylopentaose
- X6:
-
xylohexaose
- AFM:
-
atomic force microscope
- DP:
-
degree of polymerization
- XOs:
-
xylooligosaccharides
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Acknowledgment
This work was supported by the National High-Tech Research and Development Plan (2007AA100601), and was also supported by the Science and Technology Department of Zhejinag Province of China (2006C12036).
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Sun, JY., Liu, MQ. & Weng, XY. Hydrolytic Properties of a Hybrid Xylanase and Its Parents. Appl Biochem Biotechnol 152, 428–439 (2009). https://doi.org/10.1007/s12010-008-8316-y
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DOI: https://doi.org/10.1007/s12010-008-8316-y