Mutation analysis of membrane type-1 matrix metalloproteinase (MT1-MMP). The role of the cytoplasmic tail Cys(574), the active site Glu(240), and furin cleavage motifs in oligomerization, processing, and self-proteolysis of MT1-MMP expressed in breast carcinoma cells

The Journal of Biological Chemistry
D V RozanovA Y Strongin

Abstract

Membrane type-1 matrix metalloproteinase (MT1-MMP) is a key enzyme in the activation pathway of matrix prometalloproteinase-2 (pro-MMP-2). Both activation and autocatalytic maturation of pro-MMP-2 in trans suggest that MT1-MMP should exist as oligomers on the cell surface. To better understand the functions of MT1-MMP, we designed mutants with substitutions in the active site (E240A), the cytoplasmic tail (C574A), and the RRXR furin cleavage motifs (R89A, ARAA, and R89A/ARAA) of the enzyme. The mutants were expressed in MCF7 breast carcinoma cells that are deficient in both MMP-2 and MT1-MMP. Our results supported the existence of MT1-MMP oligomers and demonstrated that a disulfide bridge involving the Cys(574) of the enzyme's cytoplasmic tail covalently links MT1-MMP monomers on the MCF7 cell surface. The presence of MT1-MMP oligomers also was shown for the enzyme naturally expressed in HT1080 fibrosarcoma cells. The single (R89A and ARAA) and double (R89A/ARAA) furin cleavage site mutants of MT1-MMP were processed in MCF7 cells into the mature proteinase capable of activating pro-MMP-2 and stimulating cell locomotion. This suggested that furin cleavage is not a prerequisite for the conversion of pro-MT1-MMP into the functiona...Continue Reading

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Citations

May 9, 2006·Cancer Metastasis Reviews·Laura GenísAlicia G Arroyo
May 9, 2006·Cancer Metastasis Reviews·Alex Y Strongin
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