A proteomic approach to identify substrates of matrix metalloproteinase-14 in human plasma

In Kwan Hwang, Sung Min Park, Se Yeon Kim, Seung Taek Lee

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Matrix metalloproteinases (MMPs) are a family of zinc-containing endopeptidases that proteolyze extracellular matrix components as well as a variety of functional proteins. Here we describe a "degradomics" method that efficiently identifies substrates of MMP-14 in a complex protein mixture, such as plasma. Plasma proteins were incubated in the presence or absence of the MMP-14 catalytic domain and displayed on two-dimensional (2-D) gels. After a comparison of the gels, we selected 40 protein spots that reproducibly showed disparities. Upon in-gel digestion, mass determination, and peptide mass fingerprinting, we identified 15 different proteins from 31 spots. These proteins included six known substrates and nine potential substrates of MMP-14. Among the latter, the purified forms of apolipoprotein A-I, apolipoprotein E, and plasma gelsolin were cleaved in vitro by MMP-14, confirming that each of them is a novel substrate of MMP-14. These results demonstrate that our method rapidly and selectively identifies MMP-14 substrates from human plasma proteins. This method would thus constitute a powerful tool for identifying the substrates of MMPs and other proteases in highly complex mixtures of proteins and would enhance our understanding of the biological roles of these enzymes.

Original languageEnglish
Pages (from-to)79-87
Number of pages9
JournalBiochimica et Biophysica Acta - Proteins and Proteomics
Issue number1
Publication statusPublished - 2004 Oct 1

Bibliographical note

Funding Information:
This work was supported by grants from the NRL program of MOST NRDP (2000-N-NL-01-C-244), the MOST/KOSEF through Protein Network Research Center at Yonsei University (R11-2000-078-01001-0), and the Brain Korea 21 Project at Yonsei University.

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biophysics
  • Biochemistry
  • Molecular Biology


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