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Updated: Aug 7, 2026

The Multifaceted Benefits of Protein Co-expression in Escherichia coli
Published on: February 5, 2015
Optimal production of poly-gamma-glutamic acid by metabolically engineered Escherichia coli
Hao Jiang1, Longan Shang, Sung H Yoon
1State Key Laboratory of Agricultural Microbiology, National Engineering Research Centre of Microbial Pesticides, Huazhong Agricultural University, Wuhan 430070, P.R. China. yz41@public.wh.hb.cn
Abstract:
Metabolically-engineered Escherichia coli strains were developed by cloning poly-gamma-glutamic acid (gamma-PGA) biosynthesis genes, consisting of pgsB, pgsC and pgsA, from Bacillus subtilis The metabolic and regulatory pathways of gamma-PGA biosynthesis in E. coli were analyzed by DNA microarray. The inducible trc promoter and a constitutive promoter (P(HCE)) derived from the D-amino acid aminotransferase (D-AAT) gene of Geobacillus toebii were employed. The constitutive HCE promoter was more efficient than inducible trc promoter for the expression of gamma-PGA biosynthesis genes. DNA microarray analysis showed that the expression levels of several NtrC family genes, glnA, glnK, glnG, yhdX, yhdY, yhdZ, amtB, nac, argT and cbl were up-regulated and sucA, B, C, D genes were down-regulated. When (NH(4))(2)SO(4 )was added at 40 g/l into the feeding solution, the final gamma-PGA concentration reached 3.7 g/l in the fed-batch culture of recombinant E. coli/pCOpgs.
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