摘要
以构建重组菌(JM109/pBV-220-GLZ)作为耐热α-葡萄糖苷酶的生产菌株,研究了诱导温度、诱导时间以及重组菌生长的不同阶段对重组菌生产耐热α-葡萄糖苷酶的影响,并对诱导表达的重组酶进行了固定化研究。结果表明,最佳的诱导条件是:诱导温度为40 ℃,诱导时间为14 h,在重组菌D(600)为20时诱导的酶活最高。适宜的固定化条件为:海藻酸钠20 g/L, CaCl2 20 g/L,硬化时间2 h,前交联剂戊二醛的质量分数为10 %,该条件下的酶回收率高达81 %。制备的固定化酶有较好的储存稳定性和操作稳定性,重复操作15次后,酶活为初始酶活的75 %。
Abstract
Several factors influencing αglucosidase production with the recombinant Escherichia coli haroring the JM109/pBV220GLZ were investigated. The results showed that the best inducement conditions were as follows: induction temperature 40 ℃, induction time 14 h, and at OD600 of 2.0. To determine the optimum conditions of immobilization, the concentration of sodium alginate, CaCl2, and glutaraldehyde, and solidifying time were studied. The results showed that the optimum operations were: 20 g/L sodium alginate, 20 g/L CaCl2, 1.0 % glutaraldehyde, solidifying time 2 h. Under the optimum condition, the recovery rate reached 81 %. After 15 times repeated operations, the enzyme activity remained 75 %, showing good operational stability. Thus, the superior stability of the recombinant enzyme laid the base for largescale application.
裴建军,吕香香,解静聪,赵林果*.
耐热α-葡萄糖苷酶的诱导条件及重组酶的固定化[J]. 南京林业大学学报(自然科学版). 2012, 36(06): 90-94 https://doi.org/10.3969/j.jssn.1000-2006.2012.06.018
PEI Jianjun, L Xiangxiang, XIE Jingcong, ZHAO Linguo*.
Inducement condition and immobilization of thermostable αglucosidase produced by Escherichia coli[J]. Journal of Nanjing Forestry University (Natural Sciences Edition). 2012, 36(06): 90-94 https://doi.org/10.3969/j.jssn.1000-2006.2012.06.018
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基金
收稿日期:2012-03-16修回日期:2012-09-04
基金项目:国家自然科学基金项目(31070515);国家自然科学青年基金项目 (30900008);江苏高校优势学科建设工程资助项目(PAPD)
第一作者:裴建军,讲师,博士。 *通信作者:赵林果,教授,博士。Email:lg.zhao@163.com。
引文格式:裴建军,吕香香,解静聪,等. 耐热α-葡萄糖苷酶的诱导条件及重组酶的固定化[J]. 南京林业大学学报:自然科学版,2012,36(6):90-94.