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Effect of modified glucose uptake using genetic engineering techniques on high‐level recombinant protein production in escherichia coli dense cultures
Author(s) -
Chou ChihHsiung,
Bennett George N.,
San KaYiu
Publication year - 1994
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260440811
Subject(s) - escherichia coli , recombinant dna , strain (injury) , mutant , biochemistry , bioreactor , metabolic engineering , biology , pep group translocation , glucose transporter , chemistry , excretion , phosphotransferase , enzyme , gene , microbiology and biotechnology , botany , insulin , anatomy
Reduction of acetate excretion using a modified cellular glucose uptake rate was examined. An Escherichia coli strain bearing a mutationin ptsG , a gene encoding enzyme II in glucose phosphotransferase system (PTS), was constructed and characterized. The growth rate of the mutant strain was slower than its parent in glucose defined medium, butwas not affected in complex medium. Experimental results using this mutant strain showed a significant improvement in culture performance in simple batch cultivations due to reduced acetate excretion through the modified glucose uptake. Both biomass and recombinant protein productivity were increased by more than 50% with the ptsG mutant when compared to the parent strain. Recombinant protein productivity by the newly constructed strain at a level of more than 1.6 g/L was attained consistently in a simple batch bioreactor. © 1994 John Wiley & Sons, Inc.