Conformational activation of ADAMTS13

Kieron South, Brenda M Luken, James T B Crawley, Mari Thomas, Richard F Collins, Louis Deforche, Karen Vanhoorelbeke, David A Lane

    Research output: Contribution to journalArticlepeer-review


    A disintegrin and metalloprotease with thrombospondin motifs 13 (ADAMTS13) is a metalloprotease that regulates von Willebrand factor (VWF) function. ADAMTS13-mediated proteolysis is determined by conformational changes in VWF, but also may depend on its own conformational activation. Kinetic analysis of WT ADAMTS13 revealed ∼ 2.5-fold reduced activity compared with ADAMTS13 lacking its C-terminal tail (MDTCS) or its CUB1-2 domains (WTΔCUB1-2), suggesting that the CUB domains naturally limit ADAMTS13 function. Consistent with this suggestion, WT ADAMTS13 activity was enhanced ∼ 2.5-fold by preincubation with either an anti-CUB mAb (20E9) or VWF D4CK (the natural binding partner for the CUB domains). Furthermore, the isolated CUB1-2 domains not only bound MDTCS, but also inhibited activity by up to 2.5-fold. Interestingly, a gain-of-function (GoF) ADAMTS13 spacer domain variant (R568K/F592Y/R660K/Y661F/Y665F) was ∼ 2.5-fold more active than WT ADAMTS13, but could not be further activated by 20E9 mAb or VWF D4CK and was unable to bind or to be inhibited by the CUB1-2 domains, suggesting that the inhibitory effects of the CUB domains involve an interaction with the spacer domain that is disrupted in GoF ADAMTS13. Electron microscopy demonstrated a "closed" conformation of WT ADAMTS13 and suggested a more "open" conformation for GoF ADAMTS13. The cryptic spacer domain epitope revealed by conformational unfolding also represents the core antigenic target for autoantibodies in thrombotic thrombocytopenic purpura. We propose that ADAMTS13 circulates in a closed conformation, which is maintained by a CUB-spacer domain binding interaction. ADAMTS13 becomes conformationally activated on demand through interaction of its C-terminal CUB domains with VWF, making it susceptible to immune recognition.

    Original languageEnglish
    Pages (from-to)18578-18583
    Number of pages6
    JournalProceedings of the National Academy of Sciences of the United States of America
    Issue number52
    Publication statusPublished - 30 Dec 2014


    • ADAM Proteins/blood
    • ADAMTS13 Protein
    • Amino Acid Sequence
    • Amino Acid Substitution
    • Antibodies, Monoclonal, Murine-Derived/chemistry
    • Enzyme Activation
    • Humans
    • Mutation, Missense
    • Protein Structure, Tertiary
    • Purpura, Thrombotic Thrombocytopenic/enzymology
    • Sequence Deletion
    • von Willebrand Factor/chemistry

    Research Beacons, Institutes and Platforms

    • Manchester Institute of Biotechnology


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