生物技术通报 ›› 2015, Vol. 31 ›› Issue (8): 180-185.doi: 10.13560/j.cnki.biotech.bull.1985.2015.08.026

• 研究报告 • 上一篇    下一篇

重组精氨酸脱亚胺酶制备L-瓜氨酸的工艺条件优化

马越1, 2, 宿玲恰1, 2, 吴丹1, 2, 吴敬1, 2   

  1. 1.江南大学 食品科学与技术国家重点实验室,无锡 214122; 2.江南大学生物工程学院 工业生物技术教育部重点实验室,无锡 214122
  • 收稿日期:2014-12-10 出版日期:2015-08-21 发布日期:2015-08-22
  • 作者简介:马越,女,硕士研究生,研究方向:重组酶的制备和应用;E-mail:fionamy0912@sina.com

Optimization of Preparing L-citrulline by Recombinant Arginine Deiminase

Ma Yue1, 2, Su Lingqia1, 2, Wu Dan1, 2, Wu Jing1, 2   

  1. 1. State Key Laboratory of Food Science and Technology,Jiangnan University,Wuxi 214122; 2. School of Biotechnology,Key Laboratory of Industrial Biotechnology of Ministry of Education,Jiangnan University,Wuxi 214122
  • Received:2014-12-10 Published:2015-08-21 Online:2015-08-22

摘要: 将来源于Pseudomonas putida ACCC 10185的ADI编码基因克隆到表达载体pET-24a(+)中,转化Escherichia coli BL21(DE3),通过超声波破碎得到粗酶液,酶活检测ADI酶活为26 U/mL发酵液。对酶转化L-精氨酸盐酸盐生成L-瓜氨酸的反应条件进行了优化,结果表明,当底物L-精氨酸盐酸盐浓度650 g/L,反应初始pH6.0,温度37℃,加酶量24 U/g底物,转速100-200 r/min,转化时间7 h,L-瓜氨酸转化率达到100%,是目前国内外报道的酶法制备L-瓜氨酸的最高水平。

关键词: 精氨酸脱亚胺酶, L-瓜氨酸, 酶转化, 重组表达

Abstract: The arcA gene encoding ADI from Pseudomonas putida ACCC 10185 was cloned into the expression vector pET-24a(+). The vector was then transformed into Escherichia coli BL21(DE3)for intracellular production of ADI. The crude enzyme was obtained by ultrasonic treatment, and activity in the fermentation broth of recombinant E. coli BL21(DE3)was 26 U/mL. Furthermore, the condition for enzymatic conversion of L-arginine monohydrochloride to L-citrulline by the recombinant ADI was optimized. At 650 g/L of L-arginine monohydrochloride, pH6.0, 37℃, 100-200 r/min, and 24 U ADI per gram substrate incubated for 7 hours, 100% of the L-arginine monohydrochloride was transformed into L-citrulline, which was the highest level of preparing L-citrulline by enzyme method in home and abroad presently.

Key words: arginine deiminase, L-citrulline, enzymatic conversion, recombinant expression