期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 280, 期 23, 页码 21773-21778出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M502529200
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资金
- NHLBI NIH HHS [HL 72917] Funding Source: Medline
ADAMTS13, a metalloprotease, cleaves von Willebrand factor (VWF) in plasma to generate smaller, less thrombogenic fragments. The interaction of von Willebrand factor with specific ADAMTS13 domains was characterized with a binding assay employing von Willebrand factor immobilized on a plastic surface. ADAMTS13 binding was saturable and reversible. Equilibrium binding occurred within 2 h and the half-time for dissociation was similar to 4 h. Binding to von Willebrand factor was similar with either recombinant ADAMTS13 or normal plasma ADAMTS13; plasma from a patient who lacked ADAMTS13 activity showed no binding. The stoichiometry of binding was one ADAMTS13 per two von Willebrand factor monomers, and the K-d was 14 nM. The ADAMTS13 metalloprotease and disintegrin domains did not bind VWF detectably. ADAMTS13 truncated after the first thrombospondin type 1 repeat bound VWF with a K-d of 206 nM, whereas ADAMTS13 truncated after the spacer domain had a K-d of 23 nM, which is comparable with that of full-length ADAMTS13. Truncation after the eighth thrombospondin type 1 repeat reduced the binding affinity by similar to 3-fold and truncation after the seventh thrombospondin type 1 repeat in addition to the CUB domains increased the affinity for von Willebrand factor by similar to 2-fold. Therefore, the spacer domain is required for ADAMTS13 binding to von Willebrand factor. The first thrombospondin repeat also affects binding, and the C-terminal thrombospondin type 1 and CUB domains of ADAMTS13 may modulate this interaction.
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