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X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
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Crystal structure of the catalytic domain of MMP-16/MT3-MMP: characterization of MT-MMP specific features

R Lang1, M Braun, N E Sounni

  • 1Max-Planck-Institut für Biochemie, Abteilung Strukturforschung, Am Klopferspitz 18a, D-82152 Martinsried-bei-munchen, Germany.

Journal of Molecular Biology
|January 27, 2004
PubMed

Insights

Structural insights into membrane-type matrix metalloproteinases (MT-MMPs) reveal unique features of MT3-MMP, aiding in the design of specific inhibitors and understanding proMMP-2 activation. This research advances knowledge of MT-MMP function in tumor growth.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Membrane-type matrix metalloproteinases (MT-MMPs) are crucial in extracellular matrix degradation and tumor progression.
  • Four MT-MMPs activate proMMP-2 (progelatinase A), a key factor in tumor development.
  • MT-MMP overproduction correlates with increased tumor growth.

Purpose of the Study:

  • To elucidate the structural characteristics of the catalytic domain (cd) of MT3-MMP/MMP-16.
  • To investigate the structural basis for MT-MMP interaction with inhibitors and substrates.
  • To understand the role of MT-MMP structural features in proMMP-2 activation.

Main Methods:

  • X-ray crystallography to determine the structure of cdMT3-MMP in complex with batimastat.
  • Comparative structural analysis with MT1-MMP.
  • Mutagenesis experiments to assess MT-MMP-specific features.
  • Molecular docking simulations with proMMP-2.

Main Results:

  • The crystal structure of cdMT3-MMP reveals a classical MMP-fold with unique features, including a modified MT-specific loop and a closed S1' pocket.
  • MT-MMP-specific structural elements explain reduced interaction with TIMP-1.
  • Docking models suggest the MT-loop of cdMT3-MMP is involved in proMMP-2 prodomain interaction during activation.

Conclusions:

  • The unique structural properties of MT3-MMP, such as its S1' pocket and MT-loop, offer potential for designing specific inhibitors.
  • Structural data clarifies the impaired interaction of MT-MMPs with TIMP-1.
  • The proposed model of MT-MMP-mediated proMMP-2 activation highlights the critical role of the MT-loop.

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