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Membrane type 1 matrix metalloproteinase (MT1-MMP) is a membrane-bound proteinase and a cell-surface receptor and activator of gelatinase A in normal and neoplastic cells. We have expressed and purified a soluble deletion mutant of MT1-MMP lacking the transmembrane and cytoplasmic domains and an inactive mutant of the soluble MT1-MMP, where the active-site glutamic acid 240 was substituted...