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Platelet-Agglutinating Protein p37 from a Patient with Thrombotic Thrombocytopenic Purpura Has Characteristics Similar to Prethrombin 2

  • Kim, Seung-Ho (Life Science Division, Lab. of Protein Engineering, Korea Research Institute of Bioscience and Biotechnology) ;
  • Park, Soo-Jeong (Division of Hematology, Department of Internal Medicine, Our Ladys Mercy Hospital, The Catholic University of Korea) ;
  • Lee, Jong-Woo (Department of Life Science, The Jeonju University) ;
  • Jin, Jong-Youl (Division of Hematology, Department of Internal Medicine, Holy Family Hospital, The Catholic University of Korea)
  • Published : 2002.09.30
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Abstract

Thrombotic thrombocytopenic purpura (TTP) is characterized by widespread platelet thrombi in arterioles and capillaries. Unusually large or multimeric von Willebrand factor, as well as one or ore platelet-agglutinating factors, have been implicated in the pathogenesis of TTP. But, the actual mechanisms of platelet agglutination have not been satisfactorily explained. Recent studies suggested the 37-kDa platelet-agglutinating protein (PAP) p37 to be partially responsible for the formation of platelet thrombi in patients with TTP. We studied mobility in SDS-PAGE, the sequence of N-terminal amino acid residues, DNA and antigenic characteristics of PAP p37, which might be related to the pathogenesis of TTP. PAP p37 was purified from the plasma of a 31-year-old male Korean patient with acute TTP. The findings are as follows: (1) We compared PAP p37 with thrombin through the use of SDS-PAGE, either with or without $\beta$-mercaptoethanol. PAP p37 did not appear to be cleaved between the A- and B-chains of prethrombin 2. However, thrombin did cleave between those of prethrombin 2, but linked with disulfide bridge. (2) N-terminal 21 amino acid sequence of PAP p37 was T-F-G-S-G-E-A-D-X-G-L-R-P-L-F-E-K-K-S-L-E. It appeared to be identical to that of 285-305 amino acid residues of human prothrombin (prethrombin 2). (3) No prothrombin gene DNA mutation was revealed. (4). The antigenicity of PAP p37 was similar to thrombin, which was a result of the competitive binding against the anti-thrombin antibody. With these results, we conclude that PAP p37 has similar characteristics to prethrombin2.

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References

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