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烟草β—1,3—葡聚糖酶的生物学分析

材料写作网    时间: 2020-02-12 04:03:37     阅读:


  摘要 [目的]以烟草β-1,3-葡聚糖酶的氨基酸序列为材料,对其特性进行深度挖掘。[方法]采用NCBI-PROTEIN筛选蛋白序列,依次运用ProtParam、SignalP 4.1和TMHMM 2.0工具进行预测并分析烟草葡聚糖酶的理化特性、信号肽和跨膜结构的组成成分。[结果]NtBGl-2的分子量最大(40 390.76 Dk),NtBGl-3的分子量最小(37 722.64 Dk);NtBGl-1和NtBGl-2的等电点小于7.0,而NtBGl-3的等电点大于7.0;NtBGl-1和NtBGl-2属于不稳定蛋白,NtBGl-3属于稳定性蛋白,且耐热性大于NtBGl-1和NtBGl-2;NtBGl-1和NtBGl-2的优势氨基酸为甘氨酸和丝氨酸,NtBGl-3的为天冬酰氨和丙氨酸;NtBGl均含有信号肽,属于分泌蛋白;NtBGl-1无跨膜区,而NtBGl-2(13 ~35)和NtBGl-3(7 ~29)含有跨膜结构区域,属于跨膜蛋白。[结论]该研究为深入研究烟草葡聚糖酶奠定基础。
  关键词 烟草;β-1,3-葡聚糖酶;生物学
  中图分类号 S-3 文献标识码 A 文章编号 0517-6611(2018)17-0096-02
  Abstract [Objective] The amino acid sequence of tobacco β1,3glucanase was used as a material to deeply explore its characteristics. [Method]NCBIPROTEIN was used to screen protein sequences, and ProtParam, SignalP 4.1 and TMHMM 2.0 tools were used to predict physicochemical properties, signal peptide and transmembrane structure of tobacco glucan enzyme. [Result]The molecular weight of NtBGl2 was the maximum (40 390.76 Dk), and that of NtBGl3 was the minimum (37 722.64 Dk); the isoelectric point of NtBGl1 and NtBGl2 was less than 7.0, but NtBGl3 was more than 7.0; NtBGl1 and NtBGl2 were unstable proteins, NtBGl3 was a stable protein, and the heat resistance was greater than that of NtBGl1 and NtBGl2; the dominant amino acids of NtBGl1 and NtBGl2 were glycine and serine, NtBGl3 for asparagine and alanine; NtBGl contained signal peptide, belonged to secreted proteins; NtBGl1 had no transmembrane domain, while NtBGl2 (13 ~35) and NtBGl3 (7 ~29) contained transmembrane structur...

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