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Position: Home > Articles > Prediction of Active Site and Thermostability-Associated Structure of β-Glucosidase from Aspergillus niger FOOD SCIENCE 2017,38 (6) 81-87

黑曲霉β-葡萄糖苷酶的活性位点和耐热结构预测

作  者:
闫青;朱凤妹;彭利沙;王翔;张永祥;李军
单  位:
河北科技师范学院食品科技学院
关键词:
β-葡萄糖苷酶;活性位点;耐热结构;黑曲霉
摘  要:
以黑曲霉3.316基因组DNA扩增得到大小为2 080 bp的β-葡萄糖苷酶基因为研究对象,通过生物分析软件分析得出其可能含860个氨基酸残基,存在4个主要疏水区;其二级结构可能含有63.26%无规则卷曲、20.58%α-螺旋、16.16%β-折叠;发现其结构域具有(β/α)8 TIM桶域和(β/α)6夹层三明治域及纤维连接蛋白的Ⅲ-like域;根据β-葡萄糖苷酶相关结构预测其活性位点和耐热机理,发现其活性位点可能是(β/α)8 TIM桶域的Asp280和(β/α)6夹层三明治域的Glu509;211个位于疏水区的氨基酸残基、48个脯氨酸残基和α-螺旋可能与其热稳定性相关。
译  名:
Prediction of Active Site and Thermostability-Associated Structure of β-Glucosidase from Aspergillus niger
作  者:
YAN Qing;ZHU Fengmei;PENG Lisha;WANG Xiang;ZHANG Yongxiang;LI Jun;College of Food Science and Technology, Hebei Normal University of Science and Technology;
关键词:
β-glucosidase;;active site;;thermostability-associated structure;;Aspergillus niger
摘  要:
The genomic DNA extracted from Aspergillus niger 3.316 was used as template to amplify the β-glucosidase gene bgl by PCR to obtain a 2 080-bp amplicon. Bioinformatic analysis showed that the encoded protein was predicted to contain 860 amino acid residues with 4 major hydrophobic regions. Its secondary structures might contain 63.26% random coils, 20.58% α-helix, and 16.16% β-sheet. The protein consisted of(β/α)8 TIM barrel domain,(β/α)6 sandwich domain, and fibronectin Ⅲ-like domain. The active site and heat tolerance mechanism were predicted to be located in the active center of the enzyme. Its active sites might be Asp280 of(β/α)8 TIM barrel domain and Glu509 of(β/α)6 sandwich domain. The thermal stability of the glucosidase might be related to the presence of 211 amino acid residues in the hydrophobic region, 48 proline residues and α-helix.

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