Enhancement of phenazine-1-carboxylic acid production using batch and fed-batch culture of gacA inactivated Pseudomonas sp. M18G.
The enhancement of phenazine-1-carboxylic acid (PCA) production was investigated in a 10l fermentor using a gacA chromosomally inactivated mutant Pseudomonas sp. M18G combined with DO-stat feeing strategy. In batch culture, the optimal growth conditions with a two-stage agitation and aeration at 1.72vvm improved PCA production to 1987mg/l at 48h fermentation. A mathematical kinetic model consisting of cell growth, high PCA production, and substrate consumption was developed to simulate the batch culture process. Further increases in PCA production were achieved in a DO-stat fed-batch system which maintained a constant DO of 20% by a two-pulse glucose feeding strategy. With a total 6.6g/l glucose feeding, the maximum PCA production of 2597mg/l was obtained at 72h fermentation, resulting in a 44.5% increase in PCA production and 10-fold greater cell numbers compared to the batch culture. The combination strategies might pave a new way for the phenazine derivative commercial production using various pseudomonads.
Li
Yaqian
Y
Key Laboratory of Microbial Metabolism, Ministry of Education, College of Life Science and Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China.
Jiang
Haixia
H
Du
Xilin
X
Huang
Xianqing
X
Zhang
Xuehong
X
Xu
Yuhong
Y
Xu
Yuquan
Y
D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008962:Models, Theoretical; D010619:Phenazines / Q000378:metabolism; D011549:Pseudomonas / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*
D001426:Bacterial Proteins; C091100:GacA protein, Bacteria; D010619:Phenazines; C037165:1-phenazinecarboxylic acid