PMID: 4287841Mar 1, 1966Paper

The effects of adenine nucleotides on carbohydrate metabolism in pigeon-liver homogenates

The Biochemical Journal
W Gevers, H A Krebs

Abstract

1. The effects of added AMP on carbohydrate metabolism were investigated in pigeon-liver homogenates, which can degrade glucose and synthesize it from lactate. Suitable experimental conditions were established for studying such effects, including the addition of P(i) (20mm) to stabilize adenine nucleotides and supplementation with NAD(+) (0.5mm). 2. Lactate increased the rate of oxygen consumption and kept the concentration of ATP high and that of AMP relatively low. 3. Added AMP (1.25-5mm) raised the net rate of carbohydrate removal and inhibited the net formation of glucose from lactate, as well as the incorporation of lactate into glucose. These effects were accompanied by a fall in the concentrations of hexose 6-phosphates and a rise in those of fructose diphosphate and triose phosphates. When the activity of glyceraldehyde 3-phosphate dehydrogenase was limited experimentally by a low concentration of NAD(+) or when it was blocked by iodoacetate, the accumulations of fructose diphosphate and triose phosphates were large and accounted for most of the carbohydrate degraded in the presence of AMP. 4. AMP also inhibited the conversion of pyruvate into phosphoenolpyruvate. Data on the concentrations of pyruvate, phosphoenolpyruv...Continue Reading

Citations

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