CN111826363A - 一种右旋糖酐蔗糖酶突变体及其制备方法与应用 - Google Patents
一种右旋糖酐蔗糖酶突变体及其制备方法与应用 Download PDFInfo
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Abstract
本发明公开了一种右旋糖酐蔗糖酶突变体及其制备方法与应用。突变体TB‑7右旋糖酐蔗糖酶序列如SEQ ID NO:1所示,其最适催化pH为5.5,温度为30℃。与野生酶相比,突变的右旋糖酐蔗糖酶可催化单一分子量区间的微分子量右旋糖酐直接获得目标产物,克服了现有技术的缺陷,具有操作简单,能耗低,效率高的特点,是一种工艺简单,适合工业化的批量生产简便,经济,高效的方法。
Description
技术领域
本发明属于生物工程技术领域,具体涉及一种催化生产微分子量右旋糖酐的右旋糖酐蔗糖酶突变体及其制备方法与应用。
背景技术
右旋糖酐(dextran,dex)又叫α右旋糖酐,是葡萄糖单元经脱水后所构成的高分子多糖化合物。右旋糖酐结构疏松柔软,具有较好的水溶性及持水性,因此被当作保湿剂、增稠剂等应用于食品工业和其它化工行业。右旋糖酐在医药上的应用也很普遍,其中微分子右旋糖酐能改善微循环,消除血管内红细胞聚集,防止血栓形成及渗透利尿的作用,可用于治疗急性失血性休克、心肌梗塞、脑血栓、脑供不足、周围血管病及防止弥散性血管内凝血和肾功能衰竭等功效。
目前微分子量右旋糖酐主要以双酶法或多酶法催化为主要获得手段。其中大多数方法为先以右旋糖酐蔗糖酶催化获得较大分子量的右旋糖酐,在使用酸水解法或者酶水解法分解大分子右旋糖酐,从而获得微分子量右旋糖酐。但酸水解法引入了氯离子而酶水解法也引入了新的蛋白杂质,同时水解大分子右旋糖酐使得产物的分子量难以控制,其中混杂的较大分子量右旋糖酐不仅是对原料的浪费,同时也对产品的纯化造成了困难。因此,通过改造右旋糖酐蔗糖酶,开发以一步直接酶催化蔗糖生产微分子量右旋糖酐的右旋糖酐蔗糖酶突变体势在必行。
发明内容
本发明的目的在于提供一种催化生产微分子量右旋糖酐的右旋糖酐蔗糖酶突变体TB-7,其特征在于,所述突变体TB-7右旋糖酐蔗糖酶氨基酸序列如SEQ ID NO.1所示。
进一步的,所述突变体最适pH为5.5,最适温度为30℃,催化时间为4h。
本发明的第二目的在于提供一种右旋糖酐蔗糖酶突变体TB-7的编码基因TB-7,其核苷酸序列如SEQ ID NO.2所示。
本发明的第三目的在于提供一种包含右旋糖酐蔗糖酶突变体TB-7编码基因TB-7的重组载体。
本发明的第四目的在于提供一种包含右旋糖酐蔗糖酶突变体TB-7编码基因TB-7的重组菌
本发明的第五目的在于提供催化生产微分子量右旋糖酐的右旋糖酐蔗糖酶突变体TB-7的应用
本发明还提供一种催化生产微分子量右旋糖酐的右旋糖酐蔗糖酶突变体TB-7的制备方法,按以下步骤进行:
1)将TB-7编码基因和表达载体pET28a(+)相连接,并将连接产物转化至大肠杆菌BL21,获得包含TB-7的重组菌株;
2)培养重组菌株,诱导重组突变内右旋糖酐蔗糖酶的表达;
3)高压匀浆破碎含重组菌株的菌液,离心获得含右旋糖酐蔗糖酶TB-7的酶液;
4)对酶进行活性测定。
本发明的有益技术效果是:与一般右旋糖酐蔗糖酶相比,右旋糖酐蔗糖酶突变体TB-7可以直接一步酶催化生产分子量在5000~10000之间的右旋糖酐,且催化较为稳定,分子量分布较为集中,免去了先催化生成高分子量右旋糖酐再水解生产微分子量右旋糖酐的步骤。本发明的突变右旋糖酐蔗糖酶TB-7可应用于药物行业等生物技术领域。
附图说明
图1为酶催化反应体系内右旋糖酐分子量随时间变化结果图。
图2为酶催化反应体系内蔗糖果糖含量随时间变化结果图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行完整的描述,显然,所描述的实施例仅是本发明一部分实施例。基于本发明的实施例,本领域的普通技术人员再没有作出创造性劳动的前提下所获得的所有其他实施例,都属于本发明的保护范围。
实验试剂和材料
1.菌株及载体:大肠杆菌E.coli BL21(DE3)和表达载体pET28a由南京工业大学提供。该材料也可通过商业途径购买。
2.酶类及其他生化试剂:DNA聚合酶及dNTP购自南京诺唯赞生物科技股份有限公司,其他都为国产试剂(均可从普通生化试剂公司买到)
3.培养基:LB培养基:Peptone 10g/L,Yeast extract 5g/L,NaCl 10g/L,蒸馏水溶解。固体培养基在此基础上加2%(w/v)琼脂。
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)一书中所列具体方法实行,或按照试剂盒和产品说明书进行。
实施例1:右旋糖酐蔗糖酶突变体的构建
以来源于柑橘明串珠菌NRRL B-1299的基因组为模板,设计突变体引物,利用PCR扩增得到含突变基因的质粒。PCR扩增产物经1%琼脂糖凝胶电泳检验测定后,设计合适的酶切体系,加入DpnI去除带甲基化的原始模板。酶切4h后,酶切产物进行PCR产物纯化,纯化产物经核酸电泳检验确认。将所得纯化产物与大肠杆菌DH5α感受态混合,置于冰上30min,于42℃下热击90s,迅速置于冰上5min。将上步所得的感受态细胞加入至1mL LB培养基中,在37℃180rpm下活化50min,活化后感受态细胞取100uL均匀涂布于LB固体培养基平板上,37℃培养箱静置过夜,挑取平板上的单菌落接种于5mL LB培养基中,于37℃180rpm条件下过夜培养,经基因测序确定扩增结果后提取质粒备用。
PCR引物序列如下:
TB-7F:5’-aaggctttagcggctaaggatagtgc-3’
TB-7R:5’-ctatccttagccggtaaagcctta-3’
实施例2:右旋糖酐蔗糖酶突变体的表达
右旋糖酐蔗糖酶突变体TB-7的质粒经DNA限制性内切酶EcorI于37℃进行酶切线性化,酶切5h后对酶切产物进行核酸电泳检测确认。随后将PCR产物进行纯化,使用无菌水进行最终洗脱,将纯化产物化转至大肠杆菌BL21(DE3)中,转化液涂布于LB平板中37℃培养12h,长出的单菌落为表达菌株。挑取单菌落接种至5mL LB培养基中37℃200rpm下培养12h,再进一步接种到200mL LB培养基中扩大培养,当菌液OD600长至0.6~0.8时,加入0.1mMIPTG诱导培养24h。
实施例3:右旋糖酐蔗糖酶突变体表达酶活性的测定
超声破碎含右旋糖酐蔗糖酶突变体TB-7的菌液,破碎后离心收集上清液,取1mL和测量酶活用的酶活反应体系2.5mL混合反应30min,反应后加入定量DNS试剂,煮沸5min,使用分光光度计在540nm波长下测量,代入果糖标准曲线计算反应后果糖含量,判断酶活。
酶活反应体系为:乙酸钠1.46g/L,氯化钙0.05g/L,蔗糖120g/L,用20%盐酸调节pH至5.5。
酶活力的定义:在一定条件下,每分钟催化1umol蔗糖反应生成果糖所需要的酶量为1个酶活单位,用1U表示。
实施例4:不同时间酶催化产物分子量变化的测定
将破碎后的酶液以1:4的体积比与蔗糖反应体系混合,蔗糖反应体系配制方法为:蔗糖240g/L,乙酸钠0.73g/L,氯化钙0.025g/L,体系pH为5.5。在30℃下反应4h,反应中每隔1h取样,反应结束后将样品稀释200倍使用凝胶渗透色谱法(GPC)测量溶液中右旋糖酐的平均分子量。测得反应进行1h后反应体系中右旋糖酐平均分子量达到8100,反应进行2h后体系中右旋糖酐平均分子量达到8500,反应进行3h后体系中右旋糖酐平均分子量达到8700,反应进行4h体系中右旋糖酐平均分子量达到8900,从分子量检测结果来看,反应时间4h对于控制右旋糖酐分子量的效果较好。
实施例5:酶催化反应体系蔗糖果糖含量随时间变化的测定
取催化反应的样品1mL,以1g/L蔗糖和1g/L果糖标准溶液为对照,用铅柱色谱柱对样品蔗糖及果糖浓度进行检测,测得反应0h体系内蔗糖浓度为235.5g/L,果糖浓度为0;反应进行1h体系中蔗糖浓度为142.5g/L,果糖浓度为42.5g/L;反应进行2h体系中蔗糖浓度为84.1g/L,果糖浓度为73.8g/L;反应进行3h体系中蔗糖浓度为49.3g/L,果糖浓度为93.6g/L;反应进行4h体系中蔗糖浓度为24.7g/L,果糖浓度为102.1g/L。在反应进行4h之后89.5%蔗糖被消耗,蔗糖转化为右旋糖酐的反应转化率达到了96.7%。从蔗糖消耗率来看,提高酶液添加量至反应总体系酶活为4U/mL,蔗糖的残留较少,利用率较高。
序列表
<110> 南京工业大学
<120> 一种右旋糖酐蔗糖酶突变体及其制备方法与应用
<160> 2
<170> SIPOSequenceListing 1.0
<210> 1
<211> 1270
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<213> 2 Ambystoma laterale x Ambystoma jeffersonianum
<400> 1
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Gln Val Val Gly Pro Lys Asn Ile Asp Asn His Leu Gln Tyr Phe Asp
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Glu Thr Thr Gly Lys Gln Val Lys Gly Asp Phe Arg Ser Val Asn Gly
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Lys Arg Ile Tyr Phe Asn Ala Asn Leu Gly Tyr Ala Asp Asp Tyr Thr
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Thr Asp Val Ala Gly Lys Leu Val Gly Tyr Asp Ser Asn Gly Asn Gln
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Val Lys Ala Gly Tyr Val Thr Asn Ser Gln Gly Lys Thr Tyr Tyr Phe
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Asn Asn Gln Gly Glu Ala Ile Ile Gly Leu Lys Thr Asp Asn Asn Lys
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Thr Gln Tyr Phe Gly Pro Asp Gly Ala Gln Val Lys Gly Ala Phe Gln
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Gln Val Asn Gly Lys Asn Ile Tyr Phe Asp Ala Gln Thr Gly Tyr Ala
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Arg Gln Asn Val Gly Phe Leu Asp Gly Thr Ala Lys Gly Phe Asp Glu
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Gln Gly Asn Gln Ile Lys Ser Gly Ile Ala Thr Asp Leu Ser Gly Asn
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Val Tyr Tyr Phe Asp Ala Ser Gly Lys Met Leu Thr Gly Val Gln Asn
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Ile Asp Gly Lys Lys Tyr Tyr Phe Asp Glu Gln Gly His Arg Arg Arg
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Asn Tyr Ala Gly Val Phe Asn Asn Glu Phe Ile Tyr Phe Gly Leu Asp
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Gly Val Gly Gln Ser Ala Ile Glu Tyr Gln Phe Glu Lys Gly Leu Thr
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Ser Gln Asn Ser Val Ala Thr Ser His Asn Ala Ala Lys Ser Tyr Asp
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Tyr Arg Pro Thr Asp Ile Leu Arg Asn Gly Thr Lys Trp Glu Pro Ser
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Thr Glu Thr Asp Phe Arg Pro Leu Leu Met Thr Trp Trp Pro Asp Lys
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Glu Val Gln Ala Asn Tyr Leu Asn Tyr Met Ser Ala Leu Gly Leu Gly
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Asp Gln Lys Ile Tyr Thr Gly Ala Ser Ser Gln Leu Asp Leu Asn Asn
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Ala Ala Leu Ile Val Gln Glu Ala Ile Glu Lys Lys Ile Ser Leu Glu
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Phe Ile Phe Thr Asn Ser Pro Leu Val Pro Glu Ala Asn Ala Ala Glu
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Glu Gln Leu Asn Trp Ile His Tyr Leu Met Asn Phe Gly Thr Ile Thr
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Asn Ala Ser Ala Asp Glu Tyr Ala Asn Val Ile Ile Ala Lys His Ala
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<210> 2
<211> 3810
<212> DNA
<213> 2 Ambystoma laterale x Ambystoma jeffersonianum
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ggcgttgggc aaagtgccat tgaataccag tttgagaaag gattaacttc acaaaacagt 780
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ggttttttaa ctgctaattc atggtatcga cctaccgaca ttttaagaaa tggcacaaag 900
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atggcgccac aatatcgctc aagtactgac ggctcatttt tggacgcagt agatactgtt 2880
caaaatggtt atgcgtttac tgaccgctat gatttaggat ttaatgcagc agatggttct 2940
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ctttataata tgcctttgga acaagcagtt tctgtcatta gaacagataa atacggtgtt 3120
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Claims (7)
1.一种催化生产微分子量右旋糖酐的右旋糖酐蔗糖酶突变体TB-7,其特征在于,所述突变体TB-7右旋糖酐蔗糖酶氨基酸序列如SEQ ID NO:1所示。
2.根据权利要求1所述右旋糖酐蔗糖酶突变体TB-7,其特征在于,所述突变体最适pH为5.5,最适温度为30℃,催化时间为4h。
3.一种编码权利要求1所述右旋糖酐蔗糖酶突变体TB-7的编码基因TB-7,其核苷酸序列如SEQ ID NO:2所示。
4.根据权利要求3所述的包含右旋糖酐蔗糖酶突变体TB-7编码基因TB-7的重组载体。
5.根据权利要求3所述的包含右旋糖酐蔗糖酶突变体TB-7编码基因TB-7的重组菌。
6.一种制备权利要求1所述右旋糖酐蔗糖酶突变体TB-7的方法,其特征在于,按以下步骤进行:
1)将TB-7的编码基因和表达载体pET28a(+)相连接,并将连接产物转化至大肠杆菌BL21,获得包含TB-7的重组菌株;
2)培养重组菌株,诱导重组突变内右旋糖酐蔗糖酶的表达;
3)高压匀浆破碎含重组菌株的菌液,离心获得含右旋糖酐蔗糖酶TB-7的酶液;
4)对酶进行活性测定。
7.根据权利要求1~6任意一项所述催化生产微分子量右旋糖酐的右旋糖酐蔗糖酶突变体TB-7的应用。
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CN114561370A (zh) * | 2022-03-23 | 2022-05-31 | 南京工业大学 | 一种右旋糖酐蔗糖酶突变体及其制备方法与应用 |
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