双功能域β-折叠桶碱性植酸酶蛋白序列分析与酶学特性
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中央高校基本科研业务费专项资金(2018ZY18,2015ZCQ-LY-02);国家自然科学基金(31070651)


Sequencing and characterization of dual-domain β-propeller alkaline phytase
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    摘要:

    [目的]表达、纯化来源于Bacillus sp. HJB17的双功能域β-折叠桶碱性植酸酶(phyHT),并对该酶进行蛋白序列以及酶学特征分析,为该酶的广泛应用奠定基础。[方法]应用生物信息学技术,对phyHT蛋白序列进行了生物信息学分析。表达、变复性、分离纯化得到具有酶活性的可溶性phyHT蛋白溶液,通过硫酸亚铁-钼蓝法对phyHT的酶学特性进行了研究。[结果]序列分析结果显示,phyHT由633个氨基酸组成,含有2个植酸酶结构域,属于典型的BPP植酸酶,相对分子量(MW)为69321.68 Da,理论等电点为5.37,为亲水性蛋白。二级结构中,phyHT中α-螺旋(helix)、β-片层(sheet)占主要的比例,高级结构以β片层形成的桶状结构为主。酶学性质研究表明,该酶的最适反应温度为35,在45以下比较稳定。最适的pH为8.0,在pH为6.0-12.0条件之间比较稳定。低浓度的Ca2+以及Mg2+对酶活性有促进作用,Fe2+、Mn2+、Zn2+、Cu2+、Ni2+等金属离子对酶活性有抑制作用。[结论]本研究成功对phyHT进行了蛋白序列分析以及酶学性质研究,phyHT属于碱性植酸酶,酶活性高、稳定性好,在理论研究和工业生产方面均有很大应用价值。

    Abstract:

    [Objective] The aim of this study was to purify and characterize a dual-domain β-propeller alkaline phytase (phyHT) from Bacillus sp. HJB17 and to analyze the sequence features for application of the enzyme.[Methods] The amino acid sequence of phyHT was analyzed by bioinformatics methods. PhyHT protein was expressed, refolded, purified and the enzymatic properties were determined by ferrous sulfate and molybdenum blue method.[Results] Sequence analysis suggested that phyHT consisted of 633 amino acids and contained 2 phytase domain and belonged to typical BPP phytase. PhyHT was a hydrophilic protein and the molecular weight and theoretical isoelectric point were 69321.68 Da and 5.37, respectively. In the secondary structure, phyHT mainly consists of α-helix and β-sheet. Its three-dimensional structure mainly consists of β-sheet propeller. The optimum temperature of phyHT was 37℃, and stable at 45℃. PhyHT has an optimum pH of 8.0, and stable between pH 6.0 and 12.0. Low concentration of Ca2+ and Mg2+ promoted the enzymatic activity, whereas phytase activity was strongly inhibited by Fe2+, Mn2+, Zn2+, Cu2+ and Ni2+.[Conclusion] phyHT has important applications in theoretical research and in industry.

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鲁芳,张蓓,刘永,宋迎,郭刚兴,杨培龙,姚斌,郭素娟,高伟. 双功能域β-折叠桶碱性植酸酶蛋白序列分析与酶学特性[J]. 微生物学报, 2018, 58(9): 1582-1592

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  • 收稿日期:2017-11-01
  • 最后修改日期:2017-12-26
  • 在线发布日期: 2018-08-27
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