CN114807087A - 一种提高植酸酶热稳定性的方法及突变体和应用 - Google Patents
一种提高植酸酶热稳定性的方法及突变体和应用 Download PDFInfo
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- CN114807087A CN114807087A CN202210739640.9A CN202210739640A CN114807087A CN 114807087 A CN114807087 A CN 114807087A CN 202210739640 A CN202210739640 A CN 202210739640A CN 114807087 A CN114807087 A CN 114807087A
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Abstract
本发明涉及基因工程领域,具体涉及一种提高植酸酶热稳定性的方法及突变体和应用。本发明对植酸酶进行了系列突变,这些突变可能涉及引入二硫键、降低解折叠自由能、优化共进化过程中的关键残基,从而显著提高了酶的热稳定性。本发明对植酸酶APPAmut4进行突变,植酸酶突变体与亲本相比,植酸酶热稳定性增强,其中最佳突变体APPAmut9在100°C处理5 min后仍保留70%左右的活性,而野生型酶早已失活。本发明克服了现有技术的不足,提供了具有高热稳定性的适合于在能源、食品和饲料等领域中应用的植酸酶突变体。因此,本发明提供的植酸酶突变体可以很好的应用于能源、食品和饲料行业中,有广阔的应用前景。
Description
技术领域
本发明涉及基因工程领域,具体涉及一种提高植酸酶热稳定性的方法及突变体和应用。
背景技术
植酸酶(Phytase),即肌醇六磷酸磷酸水解酶(myo-inositol hexakisphosphatephosphohydrolases)是一类能够催化植酸盐水解为肌醇、肌醇磷酸酯和无机磷酸盐的磷酸酶。植酸酶在食品加工、环境保护、生物燃料生产等多种行业中存在广泛应用价值,目前最常见的则是作为饲料添加剂。鉴于饲料制粒加工过程瞬时高温的工艺要求,耐热性成为制约植酸酶工业应用的瓶颈问题之一。
蛋白质中二硫键的形成是一个氧化过程,产生一个共价键连接两个半胱氨酸残基的硫原子,将蛋白质结构固定,稳定蛋白质的活性构象,从而有助于它们的活性和稳定性。因此,二硫键工程是一种有效的改善蛋白质热稳定性的策略。然而,并不是所有的二硫键的引入都能提高稳定性,如Liu等研究发现在来源于Alkalimonas amylolytica的碱性α-淀粉酶中引入7对半胱氨酸时,只有其中3对(P35C-G426C、G116C-Q120C和R436C-M480C)导致酶的热稳定性增强,在60 °C下的半衰期较野生型分别增加了4.1、7.4和2.2 min;其余4对半胱氨酸的引入反而降低了热稳定性(LONG et al., 2014)。因此,如何选择合适的突变位点引入二硫键是提高酶热稳定性的关键问题。解折叠自由能ΔGu反映了蛋白质折叠态和解折叠态之间吉布斯自由能的差异,是反映蛋白质热稳定性的重要指标。在多序列比对时,可以发现其中一部分氨基酸残基之间存在高度相关性,而非彼此独立。在进化过程中,这表现为一种代偿现象,即当某个氨基酸残基发生突变后,与之相关的残基随之发生突变以补偿不利影响,从而维持蛋白质的结构与功能,也就是共进化现象(SUTTO et al., 2015),存在相关性的共进化残基在空间结构中邻近,对于维持蛋白质的稳定性十分重要。
发明内容
本发明的目的是提供以来源于Yersinia intermedia植酸酶APPAmut4为母本获得的热稳定性提高的突变体。
本发明的再一目的是提供上述植酸酶突变体的编码基因。
本发明的再一目的是提供包含上述植酸酶突变体编码基因的重组载体。
本发明的再一目的是提供包含上述植酸酶突变体编码基因的重组菌株。
本发明的再一目的是提供一种制备热稳定性提高的植酸酶的方法。
本发明的再一目的是提供上述植酸酶突变体的应用。
本发明对来源于Yersinia intermedia植酸酶APPAmut4进行突变,得到热稳定性提高的植酸酶突变体,其中,APPAmut4的氨基酸序列如SEQ ID NO:1所示。
根据本申请的热稳定性提高的植酸酶突变体,具有SEQ ID NO:1所示氨基酸序列经以下任意双位点突变的氨基酸序列:
第57位氨基酸由A突变为C、第103位氨基酸由A突变为C,即A57C/A103C;
第101位氨基酸由G突变为C、第116位氨基酸由V突变为C,即G101C/V116C;
第271位氨基酸由R突变为C、第413位氨基酸由E突变为C,得到突变体R271C/E413C;
第353位氨基酸由R突变为C,第401位氨基酸由L突变为C,得到突变体R353C/L401C;
第147位氨基酸由A突变为C,第268位氨基酸由Y突变为C,得到突变体A147C/Y268C。
根据本申请的技术方案,同时将APPAmut4的第57位氨基酸由A突变为C,第103位氨基酸由A突变为C,第101位氨基酸由G突变为C,第116位氨基酸由V突变为C,第271位氨基酸由R突变为C,第413位氨基酸由E突变为C,第353位氨基酸由R突变为C,第401位氨基酸由L突变为C,第147位氨基酸由A突变为C,第268位氨基酸由Y突变为C,得到突变体APPAmut5。
根据本申请的热稳定性提高的植酸酶突变体,具有SEQ ID NO:1所示氨基酸序列经以下任意突变的氨基酸序列:
第65位氨基酸由G突变为R得到突变体G65R;
第282位氨基酸由E突变为L得到突变体E282L;
第365位氨基酸由G突变为D得到突变体G365D;
第133位氨基酸由D突变为E得到突变体D133E;
第382位氨基酸由R突变为I得到突变体R382I;
第393位氨基酸由S突变为I得到突变体S393I。
根据本申请的技术方案,将APPAmut5的第65位氨基酸由G突变为R,第282位氨基酸由E突变为L,第365位氨基酸由G突变为D,得到突变体APPAmut8。
根据本申请的技术方案,将APPAmut8的第133位氨基酸由D突变为E,第382位氨基酸由R突变为I,第393位氨基酸由S突变为I,得到突变体APPAmut9。
根据本发明的具体实施方式,所述APPAmut4的突变体APPAmut5的氨基酸序列SEQID NO:2所示。
根据本发明的具体实施方式,所述APPAmut4的突变体APPAmut8的氨基酸序列SEQID NO:3所示。
根据本发明的具体实施方式,所述APPAmut4的突变体APPAmut9的氨基酸序列SEQID NO:4所示。
本发明提供了编码上述植酸酶突变体的基因。
根据本发明的具体实施方式,植酸酶突变体APPAmut5的编码基因序列如SEQ IDNO:5所示。
根据本发明的具体实施方式,植酸酶突变体APPAmut8的编码基因序列如SEQ IDNO:6所示。
根据本发明的具体实施方式,植酸酶突变体APPAmut9的编码基因序列如SEQ IDNO:7所示。
根据本发明的提高植酸酶的热稳定性的方法包括以下步骤:
将氨基酸序列如SEQ ID NO:1所示的植酸酶进行以下任意双位点突变:
第57位氨基酸由A突变为C、第103位氨基酸由A突变为C,即A57C/A103C;
第101位氨基酸由G突变为C、第116位氨基酸由V突变为C,即G101C/V116C;
第271位氨基酸由R突变为C、第413位氨基酸由E突变为C,得到突变体R271C/E413C;
第353位氨基酸由R突变为C,第401位氨基酸由L突变为C,得到突变体R353C/L401C;
第147位氨基酸由A突变为C,第268位氨基酸由Y突变为C,得到突变体A147C/Y268C,
或者,
进行以下任意单点突变:
第65位氨基酸由G突变为R得到突变体G65R;
第282位氨基酸由E突变为L得到突变体E282L;
第365位氨基酸由G突变为D得到突变体G365D;
第133位氨基酸由D突变为E得到突变体D133E;
第382位氨基酸由R突变为I得到突变体R382I;
第393位氨基酸由S突变为I得到突变体S393I。
根据本申请的提高植酸酶的热稳定性的方法,包括以下步骤,同时将氨基酸序列如SEQ ID NO:1所示的植酸酶进行以下突变:
第57位氨基酸由A突变为C,第103位氨基酸由A突变为C,第101位氨基酸由G突变为C,第116位氨基酸由V突变为C,第271位氨基酸由R突变为C,第413位氨基酸由E突变为C,第353位氨基酸由R突变为C,第401位氨基酸由L突变为C,第147位氨基酸由A突变为C,第268位氨基酸由Y突变为C。
根据本申请的提高植酸酶的热稳定性的方法,包括以下步骤,同时将氨基酸序列如SEQ ID NO:1所示的植酸酶进行以下突变:
第57位氨基酸由A突变为C,第103位氨基酸由A突变为C,第101位氨基酸由G突变为C,第116位氨基酸由V突变为C,第271位氨基酸由R突变为C,第413位氨基酸由E突变为C,第353位氨基酸由R突变为C,第401位氨基酸由L突变为C,第147位氨基酸由A突变为C,第268位氨基酸由Y突变为C,第65位氨基酸由G突变为R,第282位氨基酸由E突变为L,第365位氨基酸由G突变为D。
根据本申请的提高植酸酶的热稳定性的方法,包括以下步骤,同时将氨基酸序列如SEQ ID NO:1所示的植酸酶进行以下突变:
第57位氨基酸由A突变为C,第103位氨基酸由A突变为C,第101位氨基酸由G突变为C,第116位氨基酸由V突变为C,第271位氨基酸由R突变为C,第413位氨基酸由E突变为C,第353位氨基酸由R突变为C,第401位氨基酸由L突变为C,第147位氨基酸由A突变为C;第268位氨基酸由Y突变为C,第65位氨基酸由G突变为R,第282位氨基酸由E突变为L,第365位氨基酸由G突变为D;第133位氨基酸由D突变为E,第382位氨基酸由R突变为I,第393位氨基酸由S突变为I。
本发明提供了包含上述植酸酶突变体的编码基因的重组载体。
本发明还提供了包含上述植酸酶突变体的编码基因的重组菌株。
根据本发明的具体实施方式,制备热稳定性提高的植酸酶的方法如下所述:
(1)用含有植酸酶突变体的编码基因的重组载体转化宿主细胞,得到重组菌株;
(2)培养重组菌株,诱导植酸酶表达;
(3)回收并纯化所表达的植酸酶。
本发明的有益效果:
本发明对植酸酶进行了系列突变,这些突变可能涉及引入二硫键、降低解折叠自由能、优化共进化过程中的关键残基,从而显著提高了酶的热稳定性。本发明对植酸酶APPAmut4进行突变,植酸酶突变体与亲本相比,植酸酶热稳定性增强,其中最佳突变体APPAmut9在100 °C处理5 min后仍保留70%左右的活性,而野生型酶早已失活。本发明克服了现有技术的不足,提供了具有高热稳定性的适合于在能源、食品和饲料等领域中应用的植酸酶突变体。因此,本发明提供的植酸酶突变体可以很好的应用于能源、食品和饲料行业中,有广阔的应用前景。
附图说明
图1显示植酸酶APPAmut4与各单点、双点突变体的最适温度对比;
图2显示植酸酶APPAmut4与各组合突变体的最适温度对比;
图3显示植酸酶APPAmut4与各单点、双点突变体在65 °C下处理的热稳定性对比;
图4显示植酸酶APPAmut4与各组合突变体在65 °C下处理的热稳定性对比;
图5显示植酸酶APPAmut4与突变体在65°C下的t 1/2对比。
具体实施方式
试验材料和试剂:
1、菌株及载体:表达宿主为Pichia pastoris GS115,表达质粒载体为pPICZαA。
2、酶类及其它生化试剂:限制性内切酶等试剂均可从普通生化试剂公司购买得到)。
3、培养基:
(1)大肠杆菌培养基低盐LB(LLB)(1 %蛋白胨、0.5 %酵母提取物、0.5 % NaCl,pH自然);
(2)毕赤酵母培养基YPD(1%酵母提取物,2%蛋白胨,2%葡萄糖,pH自然);
(3)BMGY培养基(1%酵母提取物,2%蛋白胨,1%甘油,1.34% YNB,0.00004%生物素,pH自然);
(4)BMMY培养基(1%酵母提取物,2%蛋白胨,0.5%甲醇,1.34% YNB,0.00004%生物素,pH自然);
说明:以下实施例中未作具体说明的分子生物学实验方法,均参照《分子克隆实验指南》(第三版)J.萨姆布鲁克一书中所列的具体方法进行,或者按照试剂盒和产品说明书进行。
植酸酶活性测定方法:
将酶液用0.1 mol/L含有0.05% BSA和0.05% Triton X-100的pH 5.5 HAc-NaAc缓冲液进行稀释,将100 µL稀释后的酶液加入到900 µL植酸钠底物(用0.1 mol/L的pH 5.5的HAc-NaAc缓冲液配制)中,在37 °C反应10 min,加入1 mL 10%(W/V)TCA终止反应,最后加入1 mL显色液[1%(W/V)四水合钼酸铵,3.2%(V/V)浓硫酸,7.32%(W/V)硫酸亚铁]进行显色。对照则是在加酶液之前先加入TCA混匀使酶变性,其他相同。显色后,在700 nm光吸收下测定OD值,计算酶活。
实施例1、植酸酶的定点突变
以来源于Yersinia intermedia的植酸酶APPAmut4作为母本,将氨基酸序列如SEQID NO:1所示的植酸酶APPAmut4进行定点突变,获得所需突变体。
(1)分别获得以下双点突变的突变体:
将APPAmut4的第57位氨基酸由A突变为C,第103位氨基酸由A突变为C,得到突变体A57C/A103C;
第101位氨基酸由G突变为C,第116位氨基酸由V突变为C,得到突变体G101C/V116C;
第271位氨基酸由R突变为C,第413位氨基酸由E突变为C,得到突变体R271C/E413C;
第353位氨基酸由R突变为C,第401位氨基酸由L突变为C,得到突变体R353C/L401C;
第147位氨基酸由A突变为C,第268位氨基酸由Y突变为C,得到突变体A147C/Y268C。
(2)分别获得以下单点突变的突变体:
将APPAmut4的第65位氨基酸由G突变为R得到突变体G65R;
第282位氨基酸由E突变为L得到突变体E282L;
第365位氨基酸由G突变为D得到突变体G365D。
第133位氨基酸由D突变为E得到突变体D133E;
第382位氨基酸由R突变为I得到突变体R382I;或
第393位氨基酸由S突变为I得到突变体S393I。
(3)同时将APPAmut4的第57位氨基酸由A突变为C,第103位氨基酸由A突变为C,第101位氨基酸由G突变为C,第116位氨基酸由V突变为C,第271位氨基酸由R突变为C,第413位氨基酸由E突变为C,第353位氨基酸由R突变为C,第401位氨基酸由L突变为C,第147位氨基酸由A突变为C,第268位氨基酸由Y突变为C,得到突变体APPAmut5。
(4)将APPAmut5的第65位氨基酸由G突变为R,第282位氨基酸由E突变为L,第365位氨基酸由G突变为D,得到突变体APPAmut8。
(5)进一步,将APPAmut8的第133位氨基酸由D突变为E,第382位氨基酸由R突变为I,第393位氨基酸由S突变为I,得到突变体APPAmut9。
定点突变参照Fast Mutagenesis System(北京全式金生物技术有限公司)说明书进行,引物如下表所示,通过PCR的方法进行相应突变体的构建。
表1 定点突变所需引物
实施例2、植酸酶工程菌株的构建
以质粒pPICZαA-appamut4为模板,使用含有相应突变位点的引物进行PCR扩增。之后对PCR扩增产物进行1%琼脂糖凝胶电泳分析,若条带大小与理论值一致,则表明PCR反应成功获得了目的产物。为了消除模板质粒对后续实验的干扰,根据模板质粒与PCR产物的甲基化差异,向PCR体系中加入1 µL限制性内切酶Dpn I,37 °C酶切1~2 h。之后取10 µL产物转化大肠杆菌DMT感受态细胞。待测序正确后,提取重组质粒,利用限制性内切酶Pme I进行线性化,产物纯化回收并电击转化毕赤酵母GS115感受态细胞,获得毕赤酵母重组表达菌株。
实施例3、APPAmut4及突变体植酸酶的制备
(1)蛋白的诱导表达
将得到的重组表达菌株接种至YPD培养基中进行种子培养,200 rpm,30 °C培养48h后,以1%接种量转接至BMGY培养基中,200 rpm,30 °C培养48 h。之后4500 rpm离心5 min,弃上清,收集菌体并加入含有0.5%甲醇的BMMY培养基进行诱导表达,每12 h补加0.5%甲醇,共诱导48 h。
(2)蛋白的纯化
将诱导表达后的菌液12000 rpm离心10 min,收集上清进行浓缩,再用20 mM pH8.0 Tris-HCl进行透析。然后将透析后的酶液进行阴离子交换层析,A液为20 mM pH 8.0Tris-HCl,B液为A液加1 M NaCl,纯化蛋白,收集洗脱液,进行SDS-PAGE分析。
实施例4、APPAmut4及突变体植酸酶的性质测定
(1)最适温度测定
在0.1mol/L pH 5.5 HAc-NaAc缓冲液条件下,分别在不同温度(30 °C、35 °C、40°C、45 °C、50 °C、55 °C、60 °C、65 °C和70 °C)下对野生型和突变体的酶活性进行测定来确定最适温度,最适温度对应活性定义为100%,依次计算其余温度下的剩余酶活。如图1所示,APPAmut4的最适温度为55 °C,突变体A57C/A103C的最适温度提高为60 °C,L253C/P331C的最适温度反而降为50 °C,其余突变体则保持不变,但是其中D133E、R382I和S393I在60 °C下的酶活几乎与55 °C持平,即这3个突变体在55到60°C之间均具有良好催化功能。对于组合突变体,如图2所示,APPAmut5、APPAmut8和APPAmut9的最适温度均为50 °C。
(2)热稳定性测定
将纯化所得蛋白用0.1 mol/L含有0.05% BSA和0.05% Triton X-100的pH 5.5HAc-NaAc缓冲液稀释至合适倍数后,取100 μL于1.5 mL EP管中,分别在65 °C下保温不同时间(0、2、5、10、15和30 min),之后测定对应酶活,以保温0 min的活性为100%,计算不同保温时间下的剩余酶活。
如图3所示,APPAmut4在65 °C下处理10 min后,剩余酶活为12.3%,而各双点和单点突变体的剩余酶活则在13.6%~64.4%之间;如图4所示,组合突变体APPAmut5、APPAmut8和APPAmut9在65 °C下处理10 min后剩余酶活分别为84.3%、89.9%和93.2%。
半衰期t 1/2是指在给定温度下,初始活性降低50%所需的时间,由以下公式计算得出:
其中,k d为失活速率常数,可以通过线性回归获得:
式中,At是指剩余活性,A0是初始活性,t是在所研究温度下的处理时间。
如图5所示,APPAmut4在65 °C下的t 1/2值为3.4 min,而各双点和单点突变体的t 1/2值则在4.0~18.6 min之间,分别提高了0.6~15.2 min;组合突变体APPAmut5、APPAmut8和APPAmut9在65 °C下的t 1/2值分别为192.5、247.6和256.7 min,分别较APPAmut4提高了56、72和74倍。在实际应用中,酶的使用寿命与它们的动力学稳定性(即蛋白质在经历不可逆变性时保持部分活性所需的时间或温度)显著相关。半衰期t 1/2则是酶的动力学稳定性常用表征参数,其值越大,代表酶动力学稳定性越高。通过实验测定可知,相较于APPAmut4,突变体的t 1/2值不同程度增大,表明其热稳定性不同程度提升。其中APPAmut9的t 1/2值高达256.7min,热稳定性提升幅度显著。
(3)动力学参数测定
配制不同浓度的植酸钠(0.05-1.00 mM)作为底物,在37 °C、pH 5.5条件下进行植酸酶的活性测定。之后使用软件GraphPad Prism进行数据处理,拟合米氏方程并计算出K m和k cat值。如表2所示,APPAmut4的K m为0.14 mM,突变体A57C/A103C、G101C/V116C、A147C/Y268C、R271C/E413C、R353C/L401C、G65R的K m不同程度提高,在0.18~0.22之间,表明其底物亲和力下降。APPAmut4的催化效率k cat/K m为12322 /mM/s,突变体A147C/Y268C和G65R的k cat/K m分别降低至10823和9009 /mM/s,表明突变影响了其催化活性;其余单点、双点突变体的催化效率保持不变或稍有提高。对于组合突变体APPAmut5、APPAmut8和APPAmut9,其k cat/K m与APPAmut4相比基本不变,分别为11632、13018和11537 /mM/s,表明热稳定性显著提升的同时并未降低其催化效率。
表2 APPAmut4和突变体的动力学参数
以上实施例仅用于理解本申请的技术方案,不限定本申请的保护范围。
序列表
<110> 中国农业科学院北京畜牧兽医研究所
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Thr Lys Val Ser Leu Ser Gly Pro Leu Ala Leu Ser Ser Thr Leu Gly
210 215 220
Glu Ile Phe Leu Leu Gln Asn Ser Gln Ala Met Pro Asp Val Ala Trp
225 230 235 240
His Arg Leu Thr Gly Glu Asp Asn Trp Ile Ser Leu Leu Ser Leu His
245 250 255
Asn Ala Gln Phe Asp Leu Met Ala Lys Thr Pro Cys Ile Ala Cys His
260 265 270
Lys Gly Thr Pro Leu Leu Gln Gln Ile Leu Thr Ala Leu Val Leu Gln
275 280 285
Arg Asp Ala Gln Gly Gln Thr Leu Pro Leu Ser Pro Gln Thr Lys Ile
290 295 300
Leu Phe Leu Gly Gly His Asp Thr Asn Ile Ala Asn Ile Ala Gly Met
305 310 315 320
Leu Gly Leu Asn Trp Gln Leu Pro Gln Gln Pro Asp Asn Thr Pro Pro
325 330 335
Gly Gly Gly Leu Val Phe Glu Leu Trp Gln Asn Pro Asp Asn His Gln
340 345 350
Cys Tyr Val Ala Val Lys Leu Phe Tyr Gln Thr Met Asp Gln Leu Arg
355 360 365
Asn Ala Glu Lys Leu Asp Leu Lys Asn Asn Pro Ala Gly Arg Val Pro
370 375 380
Val Ala Ile Asp Gly Cys Glu Asn Ser Gly Asp Asp Lys Leu Cys Gln
385 390 395 400
Cys Asp Thr Phe Gln Lys Lys Val Ala Gln Ala Ile Cys Pro Ala Cys
405 410 415
His Ile
<210> 4
<211> 418
<212> PRT
<213> 人工序列(Artificial Sequence)
<400> 4
Ala Ala Pro Val Ala Ile Gln Pro Thr Gly Tyr Thr Leu Glu Arg Val
1 5 10 15
Val Ile Leu Ser Arg His Gly Val Arg Ser Pro Thr Lys Gln Thr Gln
20 25 30
Leu Met Asn Asp Val Thr Pro Asp Thr Trp Pro Gln Trp Pro Val Ala
35 40 45
Ala Gly Glu Leu Thr Pro Arg Gly Cys Gln Leu Val Thr Leu Met Gly
50 55 60
Arg Phe Tyr Gly Asp Tyr Phe Arg Ser Gln Gly Leu Leu Ala Ala Gly
65 70 75 80
Cys Pro Thr Asp Ala Asp Ile Tyr Ala Gln Ala Asp Val Asp Gln Arg
85 90 95
Thr Arg Leu Thr Cys Gln Cys Phe Leu Asp Gly Ile Ala Pro Gly Cys
100 105 110
Gly Leu Lys Cys His Tyr Gln Ala Asp Leu Lys Lys Val Asp Pro Leu
115 120 125
Phe His Pro Val Glu Ala Gly Val Cys Lys Leu Asp Ser Thr Gln Thr
130 135 140
His Lys Cys Val Glu Glu Arg Leu Gly Gly Pro Leu Ser Glu Leu Ser
145 150 155 160
Lys Arg Tyr Ala Lys Pro Phe Ala Gln Met Gly Glu Ile Leu Asn Phe
165 170 175
Ala Ala Ser Pro Tyr Cys Lys Ser Leu Gln Gln Gln Gly Lys Thr Cys
180 185 190
Asp Phe Ala Asn Phe Ala Ala Asn Lys Ile Thr Val Asn Lys Pro Gly
195 200 205
Thr Lys Val Ser Leu Ser Gly Pro Leu Ala Leu Ser Ser Thr Leu Gly
210 215 220
Glu Ile Phe Leu Leu Gln Asn Ser Gln Ala Met Pro Asp Val Ala Trp
225 230 235 240
His Arg Leu Thr Gly Glu Asp Asn Trp Ile Ser Leu Leu Ser Leu His
245 250 255
Asn Ala Gln Phe Asp Leu Met Ala Lys Thr Pro Cys Ile Ala Cys His
260 265 270
Lys Gly Thr Pro Leu Leu Gln Gln Ile Leu Thr Ala Leu Val Leu Gln
275 280 285
Arg Asp Ala Gln Gly Gln Thr Leu Pro Leu Ser Pro Gln Thr Lys Ile
290 295 300
Leu Phe Leu Gly Gly His Asp Thr Asn Ile Ala Asn Ile Ala Gly Met
305 310 315 320
Leu Gly Leu Asn Trp Gln Leu Pro Gln Gln Pro Asp Asn Thr Pro Pro
325 330 335
Gly Gly Gly Leu Val Phe Glu Leu Trp Gln Asn Pro Asp Asn His Gln
340 345 350
Cys Tyr Val Ala Val Lys Leu Phe Tyr Gln Thr Met Asp Gln Leu Arg
355 360 365
Asn Ala Glu Lys Leu Asp Leu Lys Asn Asn Pro Ala Gly Ile Val Pro
370 375 380
Val Ala Ile Asp Gly Cys Glu Asn Ile Gly Asp Asp Lys Leu Cys Gln
385 390 395 400
Cys Asp Thr Phe Gln Lys Lys Val Ala Gln Ala Ile Cys Pro Ala Cys
405 410 415
His Ile
<210> 5
<211> 1258
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 5
gctgctccag tcgctatcca acctactggt tacactcttg agagagttgt catcttgtct 60
agacatggtg ttagatcccc aactaagcag acccaattga tgaacgatgt gacacctgac 120
acgtggcctc aatggccagt tgcagctggt gagttgacac caagaggttg tcagttggtt 180
actttgatgg gtggattcta cggtgactat ttcagatccc aaggattgct tgctgccggc 240
tgtcctactg atgctgacat ctacgcacaa gctgacgttg atcaaagaac tcgtttgacc 300
tgtcaatgtt tcttggatgg tatcgctcca ggatgtggct tgaaatgtca ctaccaggct 360
gatttgaaga aggttgatcc actgttccac cctgttgatg caggtgtttg taagcttgac 420
tctactcaaa cccacaaatg tgttgaagag agattgggtg gtccattgag cgaactttcg 480
aagagatacg ccaaaccttt tgcacaaatg ggagagatcc tgaacttcgc agcgtcacct 540
tactgtaaga gtttgcaaca gcaaggtaag acttgcgact ttgccaactt cgctgccaac 600
aagatcactg tcaacaagcc tggaacgaaa gtatccttgt ctggtccatt ggctctgtct 660
tccactcttg gagaaatctt cttgctgcaa aactctcaag ctatgccaga tgttgcctgg 720
cacagattga ccggtgagga caactggatt tctttgctct ccttacacaa tgcccaattc 780
gatctgatgg caaagactcc ttgtattgct tgtcacaaag gaactccctt gcttcagcaa 840
atcgaaactg ctttggtcct ccaaagggac gcccagggtc aaactttgcc attgtctcct 900
cagaccaaga tcctgttctt gggtggacac gatactaaca tcgcaaacat cgctgggatg 960
ttgggtttga actggcaact tccacagcaa ccagacaaca ccccacctgg cggtggtcta 1020
gtcttcgagt tgtggcaaaa ccctgacaac caccagtgtt acgttgctgt aaagttgttc 1080
tatcagacta tgggacaatt gcgtaacgca gagaagttgg atttgaagaa caacccagcc 1140
ggtagggttc ctgtcgcaat tgacggttgt gagaactctg gagatgacaa gttgtgccag 1200
tgtgatactt tccagaagaa ggttgctcag gccatattgt ccagcttgtc acatctaa 1258
<210> 6
<211> 1258
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 6
gctgctccag tcgctatcca acctactggt tacactcttg agagagttgt catcttgtct 60
agacatggtg ttagatcccc aactaagcag acccaattga tgaacgatgt gacacctgac 120
acgtggcctc aatggccagt tgcagctggt gagttgacac caagaggttg tcagttggtt 180
actttgatgg gtagattcta cggtgactat ttcagatccc aaggattgct tgctgccggc 240
tgtcctactg atgctgacat ctacgcacaa gctgacgttg atcaaagaac tcgtttgacc 300
tgtcaatgtt tcttggatgg tatcgctcca ggatgtggct tgaaatgtca ctaccaggct 360
gatttgaaga aggttgatcc actgttccac cctgttgatg caggtgtttg taagcttgac 420
tctactcaaa cccacaaatg tgttgaagag agattgggtg gtccattgag cgaactttcg 480
aagagatacg ccaaaccttt tgcacaaatg ggagagatcc tgaacttcgc agcgtcacct 540
tactgtaaga gtttgcaaca gcaaggtaag acttgcgact ttgccaactt cgctgccaac 600
aagatcactg tcaacaagcc tggaacgaaa gtatccttgt ctggtccatt ggctctgtct 660
tccactcttg gagaaatctt cttgctgcaa aactctcaag ctatgccaga tgttgcctgg 720
cacagattga ccggtgagga caactggatt tctttgctct ccttacacaa tgcccaattc 780
gatctgatgg caaagactcc ttgtattgct tgtcacaaag gaactccctt gcttcagcaa 840
atcttgactg ctttggtcct ccaaagggac gcccagggtc aaactttgcc attgtctcct 900
cagaccaaga tcctgttctt gggtggacac gatactaaca tcgcaaacat cgctgggatg 960
ttgggtttga actggcaact tccacagcaa ccagacaaca ccccacctgg cggtggtcta 1020
gtcttcgagt tgtggcaaaa ccctgacaac caccagtgtt acgttgctgt aaagttgttc 1080
tatcagacta tggatcaatt gcgtaacgca gagaagttgg atttgaagaa caacccagcc 1140
ggtagggttc ctgtcgcaat tgacggttgt gagaactctg gagatgacaa gttgtgccag 1200
tgtgatactt tccagaagaa ggttgctcag gccatattgt ccagcttgtc acatctaa 1258
<210> 7
<211> 1258
<212> DNA
<213> 人工序列(Artificial Sequence)
<400> 7
gctgctccag tcgctatcca acctactggt tacactcttg agagagttgt catcttgtct 60
agacatggtg ttagatcccc aactaagcag acccaattga tgaacgatgt gacacctgac 120
acgtggcctc aatggccagt tgcagctggt gagttgacac caagaggttg tcagttggtt 180
actttgatgg gtagattcta cggtgactat ttcagatccc aaggattgct tgctgccggc 240
tgtcctactg atgctgacat ctacgcacaa gctgacgttg atcaaagaac tcgtttgacc 300
tgtcaatgtt tcttggatgg tatcgctcca ggatgtggct tgaaatgtca ctaccaggct 360
gatttgaaga aggttgatcc actgttccac cctgttgaag caggtgtttg taagcttgac 420
tctactcaaa cccacaaatg tgttgaagag agattgggtg gtccattgag cgaactttcg 480
aagagatacg ccaaaccttt tgcacaaatg ggagagatcc tgaacttcgc agcgtcacct 540
tactgtaaga gtttgcaaca gcaaggtaag acttgcgact ttgccaactt cgctgccaac 600
aagatcactg tcaacaagcc tggaacgaaa gtatccttgt ctggtccatt ggctctgtct 660
tccactcttg gagaaatctt cttgctgcaa aactctcaag ctatgccaga tgttgcctgg 720
cacagattga ccggtgagga caactggatt tctttgctct ccttacacaa tgcccaattc 780
gatctgatgg caaagactcc ttgtattgct tgtcacaaag gaactccctt gcttcagcaa 840
atcttgactg ctttggtcct ccaaagggac gcccagggtc aaactttgcc attgtctcct 900
cagaccaaga tcctgttctt gggtggacac gatactaaca tcgcaaacat cgctgggatg 960
ttgggtttga actggcaact tccacagcaa ccagacaaca ccccacctgg cggtggtcta 1020
gtcttcgagt tgtggcaaaa ccctgacaac caccagtgtt acgttgctgt aaagttgttc 1080
tatcagacta tggatcaatt gcgtaacgca gagaagttgg atttgaagaa caacccagcc 1140
ggtattgttc ctgtcgcaat tgacggttgt gagaacattg gagatgacaa gttgtgccag 1200
tgtgatactt tccagaagaa ggttgctcag gccatattgt ccagcttgtc acatctaa 1258
Claims (12)
1.热稳定性提高的植酸酶突变体,其特征在于,所述突变体的具有SEQ ID NO:1所示氨基酸序列经以下任意双位点突变的氨基酸序列:
第57位氨基酸由A突变为C、第103位氨基酸由A突变为C;
第101位氨基酸由G突变为C、第116位氨基酸由V突变为C;
第271位氨基酸由R突变为C、第413位氨基酸由E突变为C;
第353位氨基酸由R突变为C,第401位氨基酸由L突变为C;或
第147位氨基酸由A突变为C,第268位氨基酸由Y突变为C。
2.根据权利要求1所述的热稳定性提高的植酸酶突变体,其特征在于,所述植酸酶突变体的氨基酸序列具有以下任意突变:
第65位氨基酸由G突变为R得到突变体G65R;
第282位氨基酸由E突变为L得到突变体E282L;
第365位氨基酸由G突变为D得到突变体G365D;
第133位氨基酸由D突变为E得到突变体D133E;
第382位氨基酸由R突变为I得到突变体R382I;或
第393位氨基酸由S突变为I得到突变体S393I。
3.根据权利要求1或2所述的热稳定性提高的植酸酶突变体,其特征在于,所述植酸酶突变体的氨基酸序列如SEQ ID NO:2、SEQ ID NO:3或SEQ ID NO:4所示。
4.植酸酶基因,其特征在于,编码权利要求1~3任意一项所述的热稳定性提高的植酸酶突变体。
5.包含权利要求4所述植酸酶基因的重组表达载体。
6.包含权利要求4所述植酸酶基因的重组菌株。
7.一种提高植酸酶的热稳定性的方法,其特征在于,所述方法包括对氨基酸序列如SEQID NO:1所示植酸酶至少进行以下双位点突变之一:
第57位氨基酸由A突变为C、第103位氨基酸由A突变为C;
第101位氨基酸由G突变为C、第116位氨基酸由V突变为C;
第271位氨基酸由R突变为C、第413位氨基酸由E突变为C;
第353位氨基酸由R突变为C,第401位氨基酸由L突变为C;或
第147位氨基酸由A突变为C,第268位氨基酸由Y突变为C。
8.根据权利要求7所述的提高植酸酶的热稳定性的方法,其特征在于,所述方法包括对氨基酸序列如SEQ ID NO:1所示植酸酶至少进行以下单位点突变之一:
第65位氨基酸由G突变为R得到突变体G65R;
第282位氨基酸由E突变为L得到突变体E282L;
第365位氨基酸由G突变为D得到突变体G365D;
第133位氨基酸由D突变为E得到突变体D133E;
第382位氨基酸由R突变为I得到突变体R382I;或
第393位氨基酸由S突变为I得到突变体S393I。
9.根据权利要求7所述的提高植酸酶的热稳定性的方法,其特征在于,所述方法进一步包括对氨基酸序列如SEQ ID NO:1所示植酸酶进行以下突变:
第57位氨基酸由A突变为C,第103位氨基酸由A突变为C,第101位氨基酸由G突变为C,第116位氨基酸由V突变为C,第271位氨基酸由R突变为C,第413位氨基酸由E突变为C,第353位氨基酸由R突变为C,第401位氨基酸由L突变为C,第147位氨基酸由A突变为C,以及第268位氨基酸由Y突变为C。
10.根据权利要求9所述的提高植酸酶的热稳定的方法,其特征在于,所述方法进一步包括对氨基酸序列如SEQ ID NO:2所示植酸酶进行以下突变:
第65位氨基酸由G突变为R,第282位氨基酸由E突变为L,第365位氨基酸由G突变为D。
11.根据权利要求10所述的提高植酸酶的热稳定的方法,其特征在于,所述方法进一步包括对氨基酸序列如SEQ ID NO:3所示植酸酶进行以下突变:
第133位氨基酸由D突变为E,第382位氨基酸由R突变为I,第393位氨基酸由S突变为I。
12.权利要求1~3中任意一项所述热稳定性提高的植酸酶突变体用于水解植酸的应用。
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EP3018203A1 (en) * | 2014-11-06 | 2016-05-11 | Fertinagro Nutrientes, S.L. | Novel phytase, method for obtaining the same and use thereof |
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CN106434595B (zh) * | 2016-07-06 | 2019-05-17 | 中国农业科学院饲料研究所 | 植酸酶突变体YkAPPA-L327V、YeAPPA-L327V及其编码基因和应用 |
CN114807087B (zh) * | 2022-06-28 | 2022-09-27 | 中国农业科学院北京畜牧兽医研究所 | 一种提高植酸酶热稳定性的方法及突变体和应用 |
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EP3018203A1 (en) * | 2014-11-06 | 2016-05-11 | Fertinagro Nutrientes, S.L. | Novel phytase, method for obtaining the same and use thereof |
US20170240872A1 (en) * | 2016-02-18 | 2017-08-24 | Dongguan APAC Biotechnology Co., Ltd. | Phytase having improved thermostability |
WO2017166562A1 (zh) * | 2016-03-28 | 2017-10-05 | 青岛蔚蓝生物集团有限公司 | 植酸酶突变体 |
CN110484521A (zh) * | 2018-05-14 | 2019-11-22 | 广东溢多利生物科技股份有限公司 | 高热稳定性的植酸酶突变体KsPHY9及其基因和应用 |
CN113862237A (zh) * | 2021-12-02 | 2021-12-31 | 中国农业科学院北京畜牧兽医研究所 | 提高植酸酶的热稳定性的方法及突变体、基因和应用 |
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