TY - JOUR
T1 - Proteome analysis of recombinant xylose-fermenting Saccharomyces cerevisiae
AU - Salusjärvi, Laura
AU - Poutanen, Marjo
AU - Pitkänen, Juha Pekka
AU - Koivistoinen, Heini
AU - Aristidou, Aristos
AU - Kalkkinen, Nisse
AU - Ruohonen, Laura
AU - Penttilä, Merja
PY - 2003/3/1
Y1 - 2003/3/1
N2 - Introduction of an active xylose utilization pathway into Saccharomyces cerevisiae, which does not naturally ferment pentose sugars, is likely to have a major impact on the overall cellular metabolism as the carbon introduced to the cells will now flow through the pentose phosphate pathway. The metabolic responses in the recombinant xylose-fermenting S. cerevisiae were studied at the proteome level by comparative two-dimensional gel electrophoresis of cellular proteins within a pH range of 3-10. Glucose-limited chemostat cultivations and corresponding chemostat cultivations performed in media containing xylose as the major carbon source were compared. The cultivations were studied in aerobic and anaerobic metabolic steady states and in addition at time points 5, 30 and 60 min after the switch-off of oxygen supply. We identified 22 proteins having a significant abundance difference on xylose compared to glucose, and 12 proteins that responded to change from aerobic to anaerobic conditions on both carbon sources. On xylose in all conditions studied, major changes were seen in the abundance of alcohol dehydrogenase 2 (Adh2p), acetaldehyde dehydrogenases 4 and 6 (Ald4p and Ald6p), and DL-glycerol 3-phosphatase (Gpp1p). Our results give indications of altered metabolic fluxes especially in the acetate and glycerol pathways in cells growing on xylose compared to glucose.
AB - Introduction of an active xylose utilization pathway into Saccharomyces cerevisiae, which does not naturally ferment pentose sugars, is likely to have a major impact on the overall cellular metabolism as the carbon introduced to the cells will now flow through the pentose phosphate pathway. The metabolic responses in the recombinant xylose-fermenting S. cerevisiae were studied at the proteome level by comparative two-dimensional gel electrophoresis of cellular proteins within a pH range of 3-10. Glucose-limited chemostat cultivations and corresponding chemostat cultivations performed in media containing xylose as the major carbon source were compared. The cultivations were studied in aerobic and anaerobic metabolic steady states and in addition at time points 5, 30 and 60 min after the switch-off of oxygen supply. We identified 22 proteins having a significant abundance difference on xylose compared to glucose, and 12 proteins that responded to change from aerobic to anaerobic conditions on both carbon sources. On xylose in all conditions studied, major changes were seen in the abundance of alcohol dehydrogenase 2 (Adh2p), acetaldehyde dehydrogenases 4 and 6 (Ald4p and Ald6p), and DL-glycerol 3-phosphatase (Gpp1p). Our results give indications of altered metabolic fluxes especially in the acetate and glycerol pathways in cells growing on xylose compared to glucose.
KW - Ethanol
KW - Metabolic engineering
KW - Pentose phosphate pathway
KW - Proteome
KW - Proteomics
KW - Saccharomyces cerevisiae
KW - Two-dimensional gel electrophoresis
KW - Xylose
UR - http://www.scopus.com/inward/record.url?scp=0345269094&partnerID=8YFLogxK
U2 - 10.1002/yea.960
DO - 10.1002/yea.960
M3 - Article
C2 - 12627397
AN - SCOPUS:0345269094
SN - 0749-503X
VL - 20
SP - 295
EP - 314
JO - Yeast
JF - Yeast
IS - 4
ER -