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Related Experiment Videos

Matrilysin: expression, purification, and characterization

D Soler1, T Nomizu, W E Brown

  • 1Center for Biochemical and Biophysical Sciences and Medicine, Harvard Medical School, Boston, Massachusetts 02115, USA.

Journal of Protein Chemistry
|October 1, 1995
PubMed
Summary
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This study effectively produced and purified the matrix metalloproteinase (MMP) promatrilysin using a glutathione transferase (GST) fusion protein. The findings reveal MMPs possess multiple zinc-binding sites crucial for their function and stability.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Matrix metalloproteinases (MMPs) are crucial enzymes involved in various physiological and pathological processes.
  • Understanding the structure and function of MMPs, particularly their metal-binding sites, is essential for therapeutic development.
  • Previous studies have suggested the presence of zinc-binding sites in MMPs, but their exact number and role require further elucidation.

Purpose of the Study:

  • To develop an efficient method for the production and purification of active promatrilysin, a specific MMP.
  • To investigate the zinc content and binding characteristics of promatrilysin.
  • To gain insights into the structural and functional roles of zinc-binding sites in MMPs.

Main Methods:

  • Expression of a glutathione transferase (GST)-promatrilysin fusion protein using the pGEX-2T vector.

Related Experiment Videos

  • Solubilization of the fusion protein from inclusion bodies using zwittergen.
  • Purification of the fusion protein via affinity chromatography on GSH agarose.
  • Cleavage of the fusion protein with thrombin to release active promatrilysin.
  • Further purification of promatrilysin using Mono S chromatography.
  • Quantification of zinc content in purified promatrilysin.

    • Main Results:

    • The GST-promatrilysin fusion protein was successfully expressed and solubilized.
    • Homogeneous promatrilysin was obtained after thrombin cleavage and Mono S chromatography.
    • Promatrilysin contains slightly more than 2 moles of zinc per mole of protein.
    • Sequence analysis revealed a conserved zinc-binding motif (HExxHxxGxxH) in MMPs, similar to astacin.

    Conclusions:

    • The developed expression and purification strategy is effective for obtaining active promatrilysin.
    • Matrix metalloproteinases possess at least two firmly bound zinc ions and potentially a third weakly bound ion.
    • These zinc ions are critical for both catalytic activity and structural stabilization of MMPs, differentiating them from other metalloproteinases like astacin.