MMP-12 catalytic domain recognizes and cleaves at multiple sites in human skin collagen type I and type III

Biochim Biophys Acta. 2010 Apr;1804(4):731-9. doi: 10.1016/j.bbapap.2009.11.014. Epub 2009 Nov 22.

Abstract

Collagens of either soft connective or mineralized tissues are subject to continuous remodeling and turnover. Undesired cleavage can be the result of an imbalance between proteases and their inhibitors. Owing to their superhelical structure, collagens are resistant to many proteases and matrix metalloproteinases (MMPs) are required to initiate further degradation by other enzymes. Several MMPs are known to degrade collagens, but the action of MMP-12 has not yet been studied in detail. In this work, the potential of MMP-12 in recognizing sites in human skin collagen types I and III has been investigated. The catalytic domain of MMP-12 binds to the triple helix and cleaves the typical sites -Gly(775)-Leu(776)- in alpha-2 type I collagen and -Gly(775)-Ile(776)- in alpha-1 type I and type III collagens and at multiple other sites in both collagen types. Moreover, it was observed that the region around these typical sites contains comparatively less prolines, of which some have been proven to be only partially hydroxylated. This is of relevance since partial hydroxylation in the vicinity of a potential scissile bond may have a local effect on the conformational thermodynamics with probable consequences on the collagenolysis process. Taken together, the results of the present work confirm that the catalytic domain of MMP-12 alone binds and degrades collagens I and III.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Binding Sites / genetics
  • Catalytic Domain
  • Chromatography, High Pressure Liquid
  • Collagen / chemistry*
  • Collagen / genetics
  • Collagen / metabolism*
  • Collagen Type I / chemistry*
  • Collagen Type I / genetics
  • Collagen Type I / metabolism*
  • Collagen Type III / chemistry*
  • Collagen Type III / genetics
  • Collagen Type III / metabolism*
  • Humans
  • Hydroxylation
  • In Vitro Techniques
  • Matrix Metalloproteinase 12 / chemistry*
  • Matrix Metalloproteinase 12 / genetics
  • Matrix Metalloproteinase 12 / metabolism*
  • Molecular Sequence Data
  • Peptide Fragments / chemistry
  • Peptide Fragments / genetics
  • Peptide Fragments / metabolism
  • Protein Conformation
  • Protein Structure, Tertiary
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / genetics
  • Recombinant Proteins / metabolism
  • Skin / metabolism*
  • Spectrometry, Mass, Electrospray Ionization
  • Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
  • Tandem Mass Spectrometry
  • Thermodynamics

Substances

  • COL3A1 protein, human
  • Collagen Type I
  • Collagen Type III
  • Peptide Fragments
  • Recombinant Proteins
  • collagen type I, alpha 1 chain
  • Collagen
  • MMP12 protein, human
  • Matrix Metalloproteinase 12