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| Content Provider | PubMed Central |
|---|---|
| Author | Buhl, W. J. Eisenlohr, L. M. Gehring, U. Preuss, I. |
| Abstract | A major soluble phospholipase A2 of human term placenta was characterized and purified about 15,000-fold to homogeneity. The apparent molecular mass as determined in SDS/polyacrylamide gels is 42 kDa. The enzyme is inhibited by dithiothreitol indicating the presence of disulphide bridges which are essential for activity. Studies with known phospholipase A2 inhibitors revealed no immediate relationship to either secretory or cytosolic phospholipases A2. The placental enzyme prefers liposomes of phosphatidylcholine and has a distinct preference for arachidonic acid in the sn-2 position. It tolerates various detergents. Roughly 10 microM Ca2+ is required for activity, but it cannot be replaced by Mg2+ or Mn2+; Zn2+, Cu2+ and Fe3+ are inhibitory. In immunoblots, the placental enzyme was not detected by two separate antisera specific for type-II phospholipases A2 but reacted very weakly with antisera directed against cytosolic phospholipase A2. From these data we suggest that this enzyme is a novel form of phospholipase A2 which may be involved in arachidonic acid mobilization both during the course of pregnancy and at parturition. |
| Starting Page | 147 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | Pt 1 |
| Volume Number | 311 |
| Language | English |
| Publisher Date | 1995-10-01 |
| 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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