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- W31277503 abstract "1. Glucose 6-phosphate dehydrogenase was isolated and partially purified from a thermophilic fungus, Penicillium duponti, and a mesophilic fungus, Penicillium notatum. 2. The molecular weight of the P. duponti enzyme was found to be 120000+/-10000 by gelfiltration and sucrose-density-gradient-centrifugation techniques. No NADP(+)- or glucose 6-phosphate-induced change in molecular weight could be demonstrated. 3. Glucose 6-phosphate dehydrogenase from the thermophilic fungus was more heat-stable than that from the mesophile. Glucose 6-phosphate, but not NADP(+), protected the enzyme from both the thermophile and the mesophile from thermal inactivation. 4. The K(m) values determined for glucose 6-phosphate dehydrogenase from the thermophile P. duponti were 4.3x10(-5)m-NADP(+) and 1.6x10(-4)m-glucose 6-phosphate; for the enzyme from the mesophile P. notatum the values were 6.2x10(-5)m-NADP(+) and 2.5x10(-4)m-glucose 6-phosphate. 5. Inhibition by NADPH was competitive with respect to both NADP(+) and glucose 6-phosphate for both the P. duponti and P. notatum enzymes. The inhibition pattern indicated a rapid-equilibrium random mechanism, which may or may not involve a dead-end enzyme-NADP(+)-6-phosphogluconolactone complex; however, a compulsory-order mechanism that is consistent with all the results is proposed. 6. The activation energies for the P. duponti and P. notatum glucose 6-phosphate dehydrogenases were 40.2 and 41.4kJ.mol(-1) (9.6 and 9.9kcal.mol(-1)) respectively. 7. Palmitoyl-CoA inhibited P. duponti glucose 6-phosphate dehydrogenase and gave an inhibition constant of 5x10(-6)m. 8. Penicillium glucose 6-phosphate dehydrogenase had a high degree of substrate and coenzyme specificity." @default.
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- W31277503 date "1972-07-01" @default.
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- W31277503 title "Purification and properties of Penicillium glucose 6-phosphate dehydrogenase" @default.
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- W31277503 doi "https://doi.org/10.1042/bj1280817" @default.
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