Characterization of human p33/41 (annexin IV), a Ca2+ dependent carbohydrate-binding protein with monoclonal anti-annexin IV antibodies, AS11 and AS17.
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| Abstract |
p33/41 (annexin IV) is a member of the family of Ca(2+)-dependent phospholipid binding proteins known as annexins. We previously described that bovine kidney p33/41 (annexin IV) has Ca(2+)-dependent carbohydrate binding activity. In this study, we purified human p33/41 (annexin IV) from the HT29, human colon adenocarcinoma cell line, as well as the bovine kidney annexin by affinity chromatography. Then, we prepared recombinant human p33/41 (annexin IV) expressed in Escherichia coli. The apparent size and the Ca(2+)-dependent carbohydrate binding properties of purified recombinant p33/41 (annexin IV) were indistinguishable from those of the bovine kidney protein. We also performed inhibition assays of carbohydrate binding and of phosphatidylserine/phosphatidylcholine liposome binding of recombinant p33/41 (annexin IV) with anti-p33/41 monoclonal antibodies (AS11 and AS17). We determined the epitopes recognized by the monoclonal antibodies by Western blot analysis using deleted-recombinant p33/41 (annexin IV). The monoclonal antibodies recognized domain 1 and/or 2 of p33/41 (annexin IV). The results of the inhibition assays and the determination of the epitope showed that a carbohydrate binding site is located at domains 3 and 4 of p33/41 (annexin IV) and on the cell surface.
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| Authors | A Satoh, E Takayama, K Kojima, H Ogawa, Y Katsura, T Kina, I Matsumoto |
| Journal | Biological & pharmaceutical bulletin (Biol Pharm Bull) Vol. 20 Issue 3 Pg. 224-9 (Mar 1997) ISSN: 0918-6158 [Print] Japan |
| PMID | 9084877 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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