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In Escherichia coli, Lon is an ATP-dependent protease which degrades misfolded proteins and certain rapidly-degraded regulatory proteins. Given that oxidatively damaged proteins are generally degraded rather than repaired, we anticipated that Lon deficient cells would exhibit decreased viability during aerobic, but not anaerobic, carbon starvation. We found that the opposite actually occurs. Wild-type...
Purified S-adenosyl-L-homocysteine hydrolase from Dictyostelium discoideum is inactivated when incubated at 25 o C with cAMP. Half maximal velocity of the inactivation process occurs at 10 μM cAMP. Catalytic activity is fully restored by further incubation with NAD + , but not with NADP + or NADH. The enzyme must be preincubated with cAMP or NAD + to induce inactivation...
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