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- W2310461175 abstract "A 5′-nucleotidase (EC 3.1.3.5) was highly purified from the soluble fraction of rat heart. The preparation appeared homogeneous by the criterion of polyacrylamide-gel electrophoresis. The enzyme was activated by ATP and ADP, and inhibited by Pi. When AMP was used as substrate, the velocity/substrate-concentration plot was sigmoidal. ATP or ADP changed the plot to hyperbolic and decreased S0.5. Pi increased both the sigmoidicity of the plot and S0.5. When IMP was used as substrate, the velocity/substrate plot was hyperbolic. ATP or ADP decreased Km and increased V. Pi changed the plot to sigmoidal and increased S0.5. Within the range of adenylate energy charge observed in surviving mammalian cells (0.7-0.9), the rate of AMP-hydrolysing activity catalysed by the 5′-nucleotidase increased sharply with decreasing energy charge. The highest activity was observed at an energy-charge value of about 0.6. The response was also observed in the presence of Pi. No change in IMP-hydrolysing activity was observed in the physiological range of adenylate energy charge, but in the presence of Pi the activity gradually increased with increasing energy charge. These results suggest the possibility that this enzyme participates in production of adenosine, a vasodilator, during hypoxia and in removal of IMP, which accumulates during the hypoxia, in the heart." @default.
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- W2310461175 date "1986-05-01" @default.
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- W2310461175 title "Regulation of rat heart cytosol 5′-nucleotidase by adenylate energy charge" @default.
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- W2310461175 doi "https://doi.org/10.1042/bj2350847" @default.
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