Cancer Research Infection and Cancer: Biology, Therapeutics, and Prevention AACR Conference on Molecular Diagnostics - 2008
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[Cancer Research 62, 675-681, February 1, 2002]
© 2002 American Association for Cancer Research

Biochemistry and Biophysics

Activation of Membrane-type Matrix Metalloproteinase 3 Zymogen by the Proprotein Convertase Furin in the trans-Golgi Network1

Tiebang Kang, Hideaki Nagase and Duanqing Pei2

Department of Pharmacology, University of Minnesota, Minneapolis, Minnesota 55455 [T. K., D. P.], and Kennedy Institute of Rheumatology, London W6 8LH, United Kingdom [H. N.]

Matrix metalloproteinases (MMPs), a family of zinc-dependent endopeptidases implicated in tumor invasion and metastasis, must undergo zymogen activation prior to expressing any proteolytic activity. Although the cysteine-switch model predicts the well-established autoactivation process, ~40% of the known MMPs possess a conserved RXKR motif between their pro- and catalytic domains and, thus, could be activated directly by members of the proprotein convertase family. To further understand this process, we analyzed the activation of proMT3-MMP as a model system. We demonstrated that the conversion of MT3-MMP zymogen into active form is dependent on both the furin-type convertase activity and the R116RKR motif. Consistently, MT3-MMP was colocalized with furin in the trans-Golgi network by confocal microscopy. However, neither furin activity nor its recognition site in MT3-MMP is required for the observed colocalization. In fact, the colocalization pattern remains intact, even in the presence of brefeldin A, an agent known to block endoplasmic reticulum to Golgi trafficking. Yet, brefeldin A completely blocked the activation of MT3-MMP. A23187, a calcium ionophore known to block furin maturation, also blocked proMT3-MMP activation but had minimal effect on the colocalization between MT3-MMP and furin. Thus, furin processes MT3-MMP zymogen in the trans-Golgi network, where they colocalize independently of their apparent enzyme-substrate relationship.




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Copyright © 2002 by the American Association for Cancer Research.