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NAD+ glycohydrolase activity located in the nuclear envelope was maximally solubilized by treatment with 0.1--0.2% Triton X-100. The residual activity largely represents the chromatin-associated NAD+ glycohydrolase. Under these conditions the phospholipids were extensively solubilized (over 90%) while leaving the nuclei physically stable, although the nuclear membranes were removed, as shown by electron microscopy. After Triton X-100 treatment, deoxyribonuclease I did not significantly affect the residual NAD+ glycohydrolase activity, although the DNA was completely broken down. This enzyme activity can be released from the nuclear pellet by incubation with phospholipase C. For comparative studies, the glucose 6-phosphatase activity, known to be present in the nuclear envelope, was investigated. Treatment with 0.01% Triton X-100 released 10--20% of the phospholipids, but without solubilizing either glucose 6-phosphatase or NAD+ glycohydrolase. Higher Triton X-100 concentrations (0.1--1.0%) inhibited glucose 6-phosphatase, but not NAD+ glycohydrolase activity. NAD+ glycohydrolase is apparently present in a latent form in the nuclear envelope. Glucose 6-phosphatase, However, shows no such latency.

Localization of oxidized nocotinamide–adenine dinucleotide glycohydrolase in the mouse liver nuclear envelope