TY - JOUR
T1 - Simultaneous overexpression of enzymes of the lower part of glycolysis can enhance the fermentative capacity of Saccharomyces cerevisiae
AU - Smits, H. P.
AU - Hauf, J.
AU - Muller, S.
AU - Hobley, Timothy John
AU - Zimmermann, F. K.
AU - Hahn-Hagerdal, B.
AU - Nielsen, Jens
AU - Olsson, Lisbeth
PY - 2000
Y1 - 2000
N2 - Recombinant S. cerevisiae strains, with elevated levels of the enzymes of lower glycolysis (glyceraldehyde-3-phosphate dehydrogenase, phosphoglycerate mutase, phosphoglycerate kinase, enolase, pyruvate kinase, pyruvate decarboxylase and alcohol dehydrogenase) were physiologically characterized, During growth on glucose the enzyme Levels in the recombinant strains (YHM4 and YHM7) were 1.1-3,4-fold higher than in the host strain (CEN.PK.K45), The recombinant strains were grown in aerobic or anaerobic batch cultures on glucose or a mixture of glucose and galactose. The specific ethanol production rates in the recombinant strains were the same as for the host strain and the physiological behaviour of the recombinant strains and the host strain was similar, When the cellular demand for ATP was increased by means of glucose pulses (final concentrations of 3.9 gn or 2.0 gn, respectively) to aerobic chemostat cultures maintained at a dilution rate of 0.08/ h, the specific carbon dioxide production rate (qCO(2)) of CEN.PK.K45 accelerated at 6 x 10(-3) mmol/g/min(2) during the first 15 min, whereas during the same time period the qCO(2) of YHM7 accelerated twice as fast at 12 x 10(-3) mmol/g/min(2), indicating a higher fermentative capacity in the recombinant strain. Copyright (C) 2000 John Wiley & Sons, Ltd.
AB - Recombinant S. cerevisiae strains, with elevated levels of the enzymes of lower glycolysis (glyceraldehyde-3-phosphate dehydrogenase, phosphoglycerate mutase, phosphoglycerate kinase, enolase, pyruvate kinase, pyruvate decarboxylase and alcohol dehydrogenase) were physiologically characterized, During growth on glucose the enzyme Levels in the recombinant strains (YHM4 and YHM7) were 1.1-3,4-fold higher than in the host strain (CEN.PK.K45), The recombinant strains were grown in aerobic or anaerobic batch cultures on glucose or a mixture of glucose and galactose. The specific ethanol production rates in the recombinant strains were the same as for the host strain and the physiological behaviour of the recombinant strains and the host strain was similar, When the cellular demand for ATP was increased by means of glucose pulses (final concentrations of 3.9 gn or 2.0 gn, respectively) to aerobic chemostat cultures maintained at a dilution rate of 0.08/ h, the specific carbon dioxide production rate (qCO(2)) of CEN.PK.K45 accelerated at 6 x 10(-3) mmol/g/min(2) during the first 15 min, whereas during the same time period the qCO(2) of YHM7 accelerated twice as fast at 12 x 10(-3) mmol/g/min(2), indicating a higher fermentative capacity in the recombinant strain. Copyright (C) 2000 John Wiley & Sons, Ltd.
M3 - Journal article
VL - 16
SP - 1325
EP - 1334
JO - Yeast
JF - Yeast
SN - 0749-503X
IS - 14
ER -