Biotechnology Bulletin ›› 2015, Vol. 31 ›› Issue (8): 180-185.doi: 10.13560/j.cnki.biotech.bull.1985.2015.08.026

• Research report • Previous Articles     Next Articles

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 Online:2015-08-21 Published:2015-08-22

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