Solubilization and reconstitution of a nuclear envelope-associated ATPase. Synergistic activation by RNA and polyphosphoinositides

C. D. Smith, W. W. Wells

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Treatment of isolated rat liver nuclear envelopes with 1% Triton X-100 solubilized 20-30% of the nuclear envelope protein and 85% of the ATPase activity. Chromatography on DEAE-Sepharose in 1% Triton X-100 at pH 7.5 removed all of the chemically measurable phospholipid from the bound ATPase activity; however, endogenously synthesized phosphatidylinositol [4-32P]phosphate (PIP) co-chromatographed with the ATPase activity on this column. Further purification by chromatography on heparin-agarose removed all of the [32P]PIP and RNA from the ATPase; however, the recovery of ATPase activity from this column was very low. RNA, polyadenylic acid, and polyguanylic acid stimulated the delipidated ATPase activity 4-6-fold. This activity was not further stimulated by the addition of phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, or phosphatidic acid, but was stimulated 2-fold by the addition of phosphatidylinositol. Addition of 40 μM PIP and 50 μg of RNA/ml resulted in a 25-fold stimulation of basal ATPase activity. Phosphatidylinositol 4,5-biphosphate, in the presence of RNA, was also able to stimulate ATPase activity but to a lower extent than that of PIP. Therefore, the nuclear envelope-associated ATPase appears to require interaction with a polynucleotide and PIP to express full activity. PIP, which is actively metabolized in the nuclear envelope, may therefore be involved in the regulation of the activity of this enzyme.

Original languageEnglish (US)
Pages (from-to)11890-11894
Number of pages5
JournalJournal of Biological Chemistry
Issue number19
StatePublished - 1984

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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