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| Most microorganisms capable of degrading cellulose and xylan synthesize a range of isoenzymes with very similar substrate specificities (1). However, xylan present in cell wall and also in the middle of lamella of plant cells is heterogeneous in structure and not degradable by a single enzyme but by a xylanolytic enzyme complex (4). Among these enzymes, endo-1,4-β-xylanase and β-D-xylosidase have been extensively studied. Others such as those containing acetylxylan esterase, arabinase, R-glucuroni-discovered during recent years (5). Since xylan hydrolysates such as xylose and xylo-oligosaccharides can be good for animal feeds and pharmaceutical, chemical, and health food industries (5), many scientists are attracted to investigate xylanases (6). |
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godjoy(金币+1): 2010-03-05 21:46
godjoy(金币+1): 2010-03-05 21:47
godjoy(金币+1): 2010-03-05 21:47
| 大多数具有降解木质素和木聚糖能力的微生物合成一系列和特异性酶作用物类似的同工酶。但是细胞壁内和植物细胞中间膜层内的木聚糖在结构和被木聚糖类复合酶降解上是多样的。而对于单一的酶是不可降解的。在这些具有降解能力酶中，endo-1,4-β-xylanase 和 β-D-xylosidase近年来被广泛的研究，还有另外一些酶像含有乙酰木聚糖酯，阿拉伯糖，R-glucuroni-discovered。因为木聚糖水解产物像木糖和木糖型低聚寡糖对于动物饲料业，制药业，化学原制造业料和保健品制造业有很大的积极作用，所以科学家们致力于研究木聚糖酶。 |
2楼2010-03-05 20:06:46
