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1. (Article ID: 8842)
 
Chen Z, Liu Y, Zaky AA, Liu L, Chen Y, Li S, Jia Y
Characterization of a novel xylanase from Aspergillus flavus with the unique properties in production of xylooligosaccharides
Journal of Basic Microbiology 59(4) (2019) 351-358
 

A novel xylanase from the filamentous fungus Aspergillus flavus was purified and characterized as the β-1,4-endoxylanase (designed as AfXynB) with a molecular mass (32.2 kDa), which is different from all of the previously reported xylanases from the same strain. AfXynB was optimally active at pH 7.5 and 55 °C, respectively. It was stable up to 50 °C within range of pH 4.0-9.5, and displayed an excellent tolerance to various cations, reagents, and proteases. AfXynB showed specific activity toward beechwood xylan but no detected activity toward CMC and pNP-β-D-xylopyranoside. The xylanase is a typical endo-xylanase; it could hydrolyze beechwood xylan to only yield xylobiose (X2) and xylopentaose (X5). Actually, this may be the first report for the endo-xylanases that displayed such a unique hydrolytic property. These findings in the present study have great implications for its future applications of the novel xylanase

purification, β-1, biochemical properties, Aspergillus flavus, xylooligosaccharides, 4-endoxylanase

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