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Mutational and structural analyses of the hinge region of membrane type 1-matrix metalloproteinase and enzyme

Pamela Osenkowski1, Samy O Meroueh, Dumitru Pavel

  • 1Department of Pathology, School of Medicine, Wayne State University, Detroit, Michigan 48201, USA.

The Journal of Biological Chemistry
|May 20, 2005
PubMed

Insights

The hinge region of Membrane type 1 (MT1)-matrix metalloproteinase (MMP) facilitates its processing, a crucial step for controlling pericellular proteolysis. Mutations revealed specific cleavage sites within the hinge, influencing downstream processing events.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Membrane type 1 (MT1)-matrix metalloproteinase (MMP) is critical for collagen degradation in physiological and pathological contexts.
  • Active MT1-MMP undergoes autocatalytic processing on the cell surface to a 44-kDa product, with Gly285 at its N-terminus.
  • The role of the hinge region and this specific cleavage site in MT1-MMP processing remains largely unknown.

Purpose of the Study:

  • To investigate the importance of the hinge region and specific cleavage sites in MT1-MMP processing.
  • To elucidate the functional role of MT1-MMP hinge modifications in its proteolytic activity.

Main Methods:

  • Generation of mutations and deletions within the MT1-MMP hinge region.
  • Analysis of MT1-MMP processing profiles using various hinge mutants and domain swaps.
  • Molecular dynamics simulations of a computational MT1-MMP model to assess hinge region dynamics.

Main Results:

  • Gly284-Gly285 was identified as the primary cleavage site for the 44-kDa MT1-MMP species, though alterations did not halt processing.
  • Mutations at the primary site redirected cleavage to downstream residues (Gln296-Ser304) within the hinge.
  • Swapping the MT1-MMP hinge with the longer MT3-MMP hinge did not inhibit MT1-MMP processing, and molecular dynamics revealed high hinge motility.

Conclusions:

  • The hinge region of MT1-MMP is intrinsically designed to facilitate its processing.
  • MT1-MMP processing is a promiscuous yet essential event, likely regulated by hinge region dynamics.
  • This processing mechanism may play a significant role in controlling pericellular proteolysis.

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