Open AccessFed‐Batch Process for Pyruvate Production by Recombinant Escherichia coli YYC202 Strain
Author(s) -
Zelić B.,
Gerharz T.,
Bott M.,
VasićRački Đ.,
Wandrey C.,
Takors R.
Publication year - 2003
Publication title -
engineering in life sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.547
H-Index - 57
eISSN - 1618-2863
pISSN - 1618-0240
DOI - 10.1002/elsc.200301756
Subject(s) - fermentation , yield (engineering) , escherichia coli , strain (injury) , chemistry , auxotrophy , recombinant dna , biochemistry , biology , materials science , anatomy , metallurgy , gene
Fed‐batch fermentation was applied to the production of pyruvate by using a recombinant Escherichia coli YYC202 strain. This strain is completely blocked in its ability to convert pyruvate into acetyl‐CoA or acetate, resulting in acetate auxotrophy during growth in glucose minimal medium. By controlling acetate and glucose feed rate, a series of lab‐scale fed‐batch experiments were performed at pH 7 and 37 °C. CO 2 production rate ( CTR ) was used for on‐line regulation of the acetate feed rate. The correlation between CTR and acetate consumption rate ( ACR ) was determined experimentally. At optimal process conditions a final pyruvate concentration higher than 62 g/L, a space‐time yield of up to 42 g/L/d and pyruvate/glucose molar yield of 1.11 mol/mol were achieved. Experimental evidence was gathered that pyruvate export is active.