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pubmed-article:7887940pubmed:abstractTextHighly purified bovine heart protein phosphatase 2A catalytic subunit lost virtually all of its activity during storage at -70 degrees. When the enzyme was preincubated with Co2+, over 35% of the original activity was restored. Freshly prepared protein phosphatase 2A purified from bovine heart was stimulated at least 3 to 4-fold by pretreatment with Co2+ or Mn2+. Activation by Co2+ appeared to be irreversible whereas activation by Mn2+ was partially reversed after the cation was chelated with excess EDTA/EGTA. The sensitivity of Co2(+)-stimulated protein phosphatase 2A to okadaic acid or inhibitor-2 was similar to that of spontaneously active protein phosphatase 2A. The enzyme was converted to a latent form by treatment with phosphate or pyrophosphate. The latent form was completely reactivated by preincubation with Co2+. These results demonstrate that protein phosphatase 2A, like phosphatase 1, can exist in a metal ion-dependent form and may represent a new mechanism for the regulation of protein phosphatase 2A activity.lld:pubmed
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pubmed-article:7887940pubmed:articleTitleA metal-dependent form of protein phosphatase 2A.lld:pubmed
pubmed-article:7887940pubmed:affiliationDepartment of Pharmacology Medical College of Ohio, Toledo 43699.lld:pubmed
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pubmed-article:7887940pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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