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- W1489360185 abstract "31P-NMR has been used to quantify inorganic phosphate (Pi) and high-energy phosphates in the isolated, functioning perfused rat kidney, while monitoring oxygen consumption, glomerular filtration rate and sodium reabsorption. Compared with enzymatic analysis, 100% of ATP, but only 25% of ADP and 27% of Pi are visible to NMR. This is indicative that a large proportion of both ADP and Pi are bound in the intact kidney. NMR is measuring free, and therefore probably cytosolic concentrations of these metabolites. ATP synthesis rate, measured by saturation transfer NMR shows the P:O ratio of 2.45 for the intact kidney. This is close to the theoretical value, suggesting the NMR visible pool is that which is involved in oxidative phosphorylation. The energy cost of Na transport, calculated from the theoretical Na:ATP of 3.0 exceeded the measured rate of ATP synthesis. Instead, Na:ATP for active transport in the perfused kidney was 12. Since the phosphorylation potential ([ATP][ADP]×[Pi]) by NMR was 10 000 M−1, the free-energy of ATP hydrolysis was 52 kJ/mol. Using this figure, the rate of ATP hydrolysis observed could fully account for the observed rate of sodium reabsorption." @default.
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- W1489360185 date "1983-04-01" @default.
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- W1489360185 title "Energetics of sodium transport in the kidney" @default.
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- W1489360185 doi "https://doi.org/10.1016/0167-4889(83)90087-3" @default.
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