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| Content Provider | PubMed Central |
|---|---|
| Author | Dongen, C. J. Van Kok, J. W. Schrama, L. H. Oestreicher, A. B. Gispen, W. H. |
| Abstract | Affinity-purified antibodies were used to identify a protein of molecular mass 45 kDa (45 kDa protein) in rat brain cytosol as phosphatidylinositol 4-phosphate (PtdIns4P) kinase. Antibodies were raised in rabbits by immunization with the purified 45 kDa protein. Anti-(45 kDa protein) immunoglobulins were isolated by affinity chromatography of the antiserum on a solid immunosorbent, which was prepared by coupling a soluble rat brain fraction, the DEAE-cellulose pool containing 10-15% 45 kDa protein, to CNBr-activated Sepharose 4B. The purified IgGs were specific for the 45 kDa protein as judged by immunoblot and by immunoprecipitation. The purified anti-(45 kDa protein) IgGs inhibited the enzyme activity of partially purified PtdIns4P kinase, whereas preimmune IgGs were ineffective. Immunoprecipitation of the 45 kDa protein from the partially purified enzyme preparation with the purified IgGs resulted in a concomitant decrease in the amount of 45 kDa protein and in PtdIns4P kinase activity. The amount of 45 kDa protein remaining in the supernatant and the activity of PtdIns4P kinase correlated with a coefficient of r = 0.87. The evidence presented lends further support for the notion that the catalytic activity of PtdIns4P kinase in rat brain cytosol resides in a 45 kDa protein. |
| Starting Page | 859 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | 3 |
| Volume Number | 233 |
| Language | English |
| Publisher Date | 1986-02-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology Biochemistry |
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