31P NMR measurements of the ADP concentration in yeast cells genetically modified to express creatine kinase - PubMed (original) (raw)
. 1990 Apr 3;29(13):3295-302.
doi: 10.1021/bi00465a021.
Affiliations
- PMID: 2185836
- DOI: 10.1021/bi00465a021
31P NMR measurements of the ADP concentration in yeast cells genetically modified to express creatine kinase
K Brindle et al. Biochemistry. 1990.
Abstract
Rabbit muscle creatine kinase has been introduced into the yeast Saccharomyces cerevisiae by transforming cells with a multicopy plasmid containing the coding sequence for the enzyme under the control of the yeast phosphoglycerate kinase promoter. The transformed cells showed creatine kinase activities similar to those found in mammalian heart muscle. 31P NMR measurements of the near-equilibrium concentrations of phosphocreatine and cellular pH together with measurements of the total extractable concentrations of phosphocreatine and creatine allowed calculation of the free ADP/ATP ratio in the cell. The calculated ratio of approximately 2 was considerably higher than the ratio of between 0.06 and 0.1 measured directly in cell extracts.
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