Chemical modification of oxalate decarboxylase with ethylenediaminetetraacetic dianhydride

doi:10.11949/j.issn.0438-1157.20160355

CIESC Journal ›› 2016, Vol. 67 ›› Issue (10): 4389-4398.DOI: 10.11949/j.issn.0438-1157.20160355

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Chemical modification of oxalate decarboxylase with ethylenediaminetetraacetic dianhydride

HE Junbin¹, LIN Rihui², LONG Han¹, WU Jia¹, CAI Xinghua¹, YANG Ying¹, CHEN Shengfeng¹

1 Guangxi Colleges and Universities Key Laboratory of Utilization of Microbial and Botanical Resources, School of Marine Sciences and Biotechnology, Guangxi University for Nationalities, Nanning 530007, Guangxi, China;
2 Key Laboratory of New Techniques for Chemical and Biological Conversion Process, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530007, Guangxi, China

Received:2016-03-28 Revised:2016-08-01 Online:2016-10-05 Published:2016-10-05
Supported by:
supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education ([2012]1707), the Natural Science Foundation of Guangxi (2014GXNSFAA118045) and the Innovation Project of Guangxi University for Nationalities (gxun-chxs2015089).

乙二胺四乙酸二酐对草酸脱羧酶的修饰改性

贺俊斌¹, 林日辉², 龙寒¹, 巫佳¹, 蔡杏华¹, 杨颖¹, 陈盛峰¹

1广西民族大学海洋与生物技术学院, 广西高校微生物与植物资源利用重点实验室, 广西南宁 530007;
2 广西民族大学化学化工学院, 化学与生物转化过程新技术重点实验室, 广西南宁 530007

通讯作者: 林日辉
基金资助:
国家教育部留学回国人员科研启动基金项目（教外司留[2012]1707号）；广西自然科学基金项目（2014GXNSFAA118045）；广西民族大学研究生教育创新计划项目（gxun-chxs2015089）。

Abstract

Abstract:

In order to improve the stability and application performance of oxalate decarboxylase (Oxdc) in the prevention and treatment of urinary calculi, chemical modification of Oxdc with ethylenediaminetetraacetic dianhydride (EDTAD) was investigated. The results of single-factor experiment showed that the extent of modification and the recovery rate of the enzymatic activity were 71.91% and 75.42%, respectively, when the reaction time was 8 h, the molar ratio of EDTAD/Oxdc was 50:1, pH 7.0, and the temperature was 37℃. The analysis results of sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS) indicated that Oxdc and EDTAD have been covalently bound. The ultraviolet-visible spectrum (UV) and circular dichroic (CD) measurement showed that the structure and conformation of Oxdc were tinily altered after modification by EDTAD. The enzymology changes of Oxdc were also analyzed, the results showed the optimum pH of EDTAD-modified Oxdc was shifted to the alkaline side about 1.5 unit and it had a higher thermostability. Moreover, through modification the adsorption capacity of Oxdc onto calcium oxalate monohydrate crystals was increased by 42.42%. These results suggested that the stability and application performance of Oxdc were significantly improved under this experiment.

Key words: urinary calculi, enzyme, oxalate decarboxylase, purification, ethylenediaminetetraacetic dianhydride, chemical modification, adsorption

摘要：

为提高草酸脱羧酶（Oxdc）在预防治疗泌尿系结石症方面的稳定性和应用性能，采用乙二胺四乙酸二酐（EDTAD）对Oxdc进行化学修饰，并初步优化了修饰条件：当修饰反应时间为8 h、EDTAD/Oxdc的摩尔比为50:1、反应pH为7.0、反应温度为37℃时，修饰率为71.91%，酶活回收率为75.42%。聚丙烯酰胺凝胶电泳（SDS-PAGE）和超高效液相色谱-质谱（UPLC-MS）联用分析证明Oxdc和EDTAD共价结合成功。紫外-可见吸收光谱（UV）和圆二色性光谱（CD）分析结果表明，修饰后Oxdc的空间结构发生了一定程度的改变。同时，部分酶学性质研究表明，经EDTAD修饰后的Oxdc较游离的Oxdc，最适pH向碱性方向偏移了约1.5个单位，耐热性和耐胰蛋白酶酶解的能力均显著增强。此外，修饰后的Oxdc在草酸钙上的吸附量明显提高。结果说明修饰后的Oxdc的稳定性显著增强，应用性能有所改善。

关键词: 泌尿系结石, 酶, 草酸脱羧酶, 纯化, 乙二胺四乙酸二酐, 化学修饰, 吸附

CLC Number:

Q814
TQ033

HE Junbin, LIN Rihui, LONG Han, WU Jia, CAI Xinghua, YANG Ying, CHEN Shengfeng. Chemical modification of oxalate decarboxylase with ethylenediaminetetraacetic dianhydride[J]. CIESC Journal, 2016, 67(10): 4389-4398.

贺俊斌, 林日辉, 龙寒, 巫佳, 蔡杏华, 杨颖, 陈盛峰. 乙二胺四乙酸二酐对草酸脱羧酶的修饰改性[J]. 化工学报, 2016, 67(10): 4389-4398.

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Chemical modification of oxalate decarboxylase with ethylenediaminetetraacetic dianhydride

乙二胺四乙酸二酐对草酸脱羧酶的修饰改性

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