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Mechanism Of Cell Surface Activation Of 72-kDa Type IV Collagenase
Activation of 72T4Cl on the cell membrane provides a basic mechanism for spatially regulated extracellular proteolysis and presents a new target for prognosis and treatment of metastatic disease. Expand
SV40-transformed human lung fibroblasts secrete a 92-kDa type IV collagenase which is identical to that secreted by normal human macrophages.
The complete structure of this enzyme is presented along with the evidence that it is identical to the 92-kDa metalloprotease secreted by normal human alveolar macrophages, phorbol ester-differentiated monocytic leukemia U937 cells, fibrosarcoma HT1080 cells, and cultured human keratinocytes. Expand
H-ras oncogene-transformed human bronchial epithelial cells (TBE-1) secrete a single metalloprotease capable of degrading basement membrane collagen.
H-ras-transformed human bronchial epithelial cells (TBE-1) secrete a single major extracellular matrix metalloprotease which is not found in the normal parental cells, which is likely the human analog of type IV collagenase detected in several rodent tumors. Expand
Human 72-kilodalton type IV collagenase forms a complex with a tissue inhibitor of metalloproteases designated TIMP-2.
Simian virus 40 (SV40)-transformed human lung fibroblasts secrete both 72-kDa type IV collagenase and a closely related 92-kDa type IV collagenase that was not detected in the parental cell line. TheExpand
Tissue cooperation in a proteolytic cascade activating human interstitial collagenase.
A cascade of proteolytic events catalyzed by the proteases secreted by cultured keratinocytes and fibroblasts that results in the activation of interstitial procollagenase is presented, which results in a 5- to 8-fold increase in collagenase specific activity. Expand
Interaction of 92-kDa type IV collagenase with the tissue inhibitor of metalloproteinases prevents dimerization, complex formation with interstitial collagenase, and activation of the proenzyme with
It is demonstrated that in the absence of TIMP, 92-kDa Type IV procollagenase (92T4Cl) can form a covalent homodimer and a novel complex with ClI, suggesting a mechanism for cooperative action of two enzymes in reducing collagen fibrils to small peptides under physiologic conditions. Expand
Plasma membrane-dependent activation of the 72-kDa type IV collagenase is prevented by complex formation with TIMP-2.
The results suggest that interaction of the carboxyl-terminal domain of the enzyme with a membrane-associated component(s) causes initiation of enzyme activation through an autoproteolytic mechanism. Expand
Interstitial Collagenase Is a Brownian Ratchet Driven by Proteolysis of Collagen
We show that activated collagenase (MMP-1) moves processively on the collagen fibril. The mechanism of movement is a biased diffusion with the bias component dependent on the proteolysis of itsExpand
Human skin fibroblast stromelysin: structure, glycosylation, substrate specificity, and differential expression in normal and tumorigenic cells.
The data indicate that the expression and the possible involvement of secreted metalloproteases in tumorigenesis result from a specific interaction between the transforming factor and the target cell, which may vary in different species. Expand
Single-Molecule Tracking of Collagenase on Native Type I Collagen Fibrils Reveals Degradation Mechanism
These findings provide a mechanistic paradigm for type I collagen degradation by MMP1 and establish a general approach to investigate MMP-fibrillar collagen interactions, which demonstrates the fundamental role of enzyme-substrate interactions including binding and motion in determining the activity of an enzyme on an extended substrate. Expand