Stabilization of ornithine decarboxylase in erythroleukemia cells depleted of ATP.
Ornithine decarboxylase activity in Friend erythroleukemia cells decayed with a half-life of 50 minutes after addition of cycloheximide and at a faster rate after addition of spermidine. Incubation with a medium containing dinitrophenol and 2-deoxy-glucose in place of glucose caused ATP depletion and blocked the turnover of ornithine decarboxylase, even after addition of spermidine. Dinitrophenol in the presence of glucose was able to provoke only a slight increase of the half-life of the enzyme. These results suggest that degradation of ornithine decarboxylase in erythroleukemia cells is ATP-dependent.
Dipartimento di Biochimica, Università di Bologna, Italy.
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Flamigni
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Marmiroli
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Guarnieri
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Caldarera
D000255:Adenosine Triphosphate / Q000378:metabolism*; D000818:Animals; D002460:Cell Line; D003513:Cycloheximide / Q000494:pharmacology; D004140:Dinitrophenols / Q000494:pharmacology; D004795:Enzyme Stability; D007700:Kinetics; D004915:Leukemia, Erythroblastic, Acute / Q000201:enzymology*; D051379:Mice; D009955:Ornithine Decarboxylase / Q000378:metabolism*
D004140:Dinitrophenols; D000255:Adenosine Triphosphate; D003513:Cycloheximide; D009955:Ornithine Decarboxylase