Abstract
The advantage of using 13C-labelled glucose in metabolic studies is that it is an important carbon and energy source for almost all biotechnologically and medically important organisms. On the other hand, the disadvantage is its relatively high cost in the labelling experiments. Looking for cheaper alternatives we found that 13C-[2] acetate or 13C-[1,2] acetate is a prospective compound for such experiments. Acetate is well incorporated by many organisms, including mammalian and insect cell cultures as preferred source of acetyl-CoA. Our experimental results using 13C NMR demonstrated that acetate was efficiently incorporated into glutamate and alanine secreted by the insect cell culture. Using D-stat culture of Saccharomyces uvarum on glucose/13C-acetate mineral media we demonstrated that the labelling patterns of proteinogenic amino acids can be well predicted on the basis of specific substrate consumption rates using the modified scheme of yeast metabolism and stoichiometric modelling. According to this scheme aspartate and alanine in S. uvarum under the experimental conditions used is synthesised in the mitochondria. Synthesis of alanine in the mitochondria was also demonstrated for Spodoptera frugiperda. For both organisms malic enzyme was also operative. For S. uvarum it was shown that the activity of malic enzyme is sufficient for supporting the mitochondrial biosynthetic reactions with NADPH.
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Abbreviations
- BDF:
-
biosynthetically directed fractional labelling
- FCS:
-
foetal calf serum
- IEAM:
-
yeast extract free medium
- MEM:
-
minimal essential medium
- MFA:
-
metabolic flux analysis
- oxac :
-
cytosolic oxaloacetate
- oxam :
-
mitochondrial oxaloacetate
- PP pathway:
-
pentose phosphate pathway
- Pyrc :
-
cytosolic pyruvate
- Pyrm :
-
mitochondrial pyruvate
- TCA:
-
tricarboxylic acid
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This work was founded through Estonian Science Foundation (Grant Nos. 5129 and 5160).
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Paalme, T., Nisamedtinov, I., Abner, K. et al. Application of 13C-[2] - and 13C-[1,2] acetate in metabolic labelling studies of yeast and insect cells. Antonie Van Leeuwenhoek 89, 443–457 (2006). https://doi.org/10.1007/s10482-005-9053-7
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DOI: https://doi.org/10.1007/s10482-005-9053-7