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Mechanisms of activation of tissue procollagenase by matrix metalloproteinase 3 (stromelysin)

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  • K Suzuki, Denmark
  • J J Enghild
  • T Morodomi, Denmark
  • G Salvesen, Denmark
  • H Nagase, Denmark
  • Interdisciplinary Nanoscience Center
  • Department of Molecular Biology
The mechanism of activation of tissue procollagenase by matrix metalloproteinase 3 (MMP-3)/stromelysin was investigated by kinetic and sequence analyses. MMP-3 slowly activated procollagenase by cleavage of the Gln80-Phe81 bond to generate a fully active collagenase of Mr = 41,000. The specific collagenolytic activity of this species was 27,000 units/mg (1 unit = 1 microgram of collagen digested in 1 min at 37 degrees C). Treatment of procollagenase with plasmin or plasma kallikrein gave intermediates of Mr = 46,000. These intermediates underwent rapid autolytic activation, via cleaving the Thr64-Leu65 bond, to give a collagenase species of Mr = 43,000 that exhibited only about 15% of the maximal specific activity. Similarly, (4-aminophenyl)mercuric acetate (APMA) activated procollagenase by intramolecular cleavage of the Val67-Met68 bond to generate a collagenase species of Mr = 43,000, but with only about 25% of the maximal specific activity. Subsequent incubation of the 43,000-Mr species with MMP-3 resulted in rapid, full activation and generated the 41,000-Mr collagenase by cleaving the Gln80-Phe81 bond. In the case of the proteinase-generated 43,000-Mr species, the action of MMP-3 was approximately 24,000 times faster than that on the native procollagenase. This indicates that the removal of a portion of the propeptide of procollagenase induces conformational changes around the Gln80-Phe81 bond, rendering it readily susceptible to MMP-3 activation. Prolonged treatment of procollagenase with APMA in the absence of MMP-3 also generated a 41,000-Mr collagenase, but this species had only 40% of the full activity and contained Val82 and Leu83 as NH2 termini. Thus, cleavage of the Gln80-Phe81 bond by MMP-3 is crucial for the expression of full collagenase activity. These results suggest that the activation of procollagenase by MMP-3 is regulated by two pathways: one with direct, slow activation by MMP-3 and the other with rapid activation in conjunction with tissue and/or plasma proteinases. The latter event may explain an accelerated degradation of collagens under certain physiological and pathological conditions.
Original languageEnglish
Pages (from-to)10261-70
Number of pages9
Publication statusPublished - 1990

    Research areas

  • Amino Acid Sequence, Collagenases, Enzyme Activation, Enzyme Precursors, Matrix Metalloproteinase 3, Metalloendopeptidases, Microbial Collagenase, Molecular Sequence Data

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