Tissue inhibitor of metalloproteinase-2 (TIMP-2) binds to the catalytic domain of the cell surface receptor, membrane type 1-matrix metalloproteinase 1 (MT1-MMP).

The Journal of Biological Chemistry
S ZuckerJ Cao

Abstract

It has been proposed that tissue inhibitor of metalloproteinase-2 (TIMP-2), in stoichiometric concentrations, serves as an intermediate in progelatinase A activation by binding to activated membrane type 1-matrix metalloproteinase 1 (MT1-MMP) on the plasma membrane. An MT1-MMP-independent cell surface receptor for TIMP-2 has also been postulated. To clarify TIMP-2 binding, we have performed 125I-TIMP-2 binding studies on transfected COS-1 cells and endothelial cells. Specific receptors for TIMP-2 were identified on COS-1 cells transfected with MT1-MMP cDNA, but not on vector-transfected cells. Treatment of MT1-MMP transfected COS-1 cells with a hydroxamic acid inhibitor of MMPs, CT-1746, but not an inactive stereoisomer, CT-1915, produced dose-dependent inhibition of specific TIMP-2 binding comparable with that noted with excess unlabeled TIMP-2. This result suggests that TIMP-2 binds to the zinc catalytic site of MT1-MMP. As demonstrated by the limited competition for binding of C-terminal deleted TIMP-2, the C-terminal domain of TIMP-2 participates in binding to MT1-MMP. Cross-linking studies followed by immunoprecipitation using antibodies to MT1-MMP were employed to identify 125I-TIMP-2.MT1-MMP complexes in MT1-MMP-transfec...Continue Reading

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