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Peptide ligands for the fibronectin type II modules of matrix metalloproteinase 2 (MMP-2)
Maria Trexler1, Klára Briknarová, Marion Gehrmann
1Institute of Enzymology, Biological Research Center, Hungarian Academy of Sciences, Budapest H-1518, Hungary.
Abstract:
The interaction of matrix metalloproteinase 2 (MMP-2) with gelatin is mediated by three repeats homologous to fibronectin type II (FN2) modules, which are inserted in the catalytic domain in proximity of the active site. We screened a random 15-mer phage display library to identify peptides that interact with the FN2 modules of MMP-2. Interestingly, the selected peptides are not gelatin-like and do not share a common, obvious sequence motif. However, they contain a high proportion of aromatic residues. The interactions of two peptides, WHWRH0RIPLQLAAGR and THSHQWRHHQFPAPT, with constructs comprising the in-tandem first and second and second and third FN2 modules of MMP-2 (Col-12 and Col-23, respectively) were characterized by NMR. Both peptides interact with Col-12 and Col-23 with apparent association constants in the mm(-1) range. Peptide binding results in perturbation of signals from residues located in the gelatin-binding pocket and flexible parts of the molecule. Although the former finding suggests that the gelatin-binding site is involved in the contact, the interpretation of the latter is less straightforward and may well reflect both the direct and indirect effects of the interaction.
Insights
Researchers identified novel peptides that bind to matrix metalloproteinase 2 (MMP-2) via its fibronectin type II (FN2) modules. These peptides interact with the gelatin-binding site, offering new avenues for MMP-2 targeted therapies.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Matrix metalloproteinase 2 (MMP-2) interacts with gelatin through fibronectin type II (FN2) modules.
- These FN2 modules are crucial for MMP-2's catalytic activity and are located near the active site.
Purpose of the Study:
- To identify novel peptides that specifically bind to the FN2 modules of MMP-2.
- To characterize the interaction between selected peptides and MMP-2 FN2 modules.
Main Methods:
- Screening of a 15-mer phage display library against MMP-2 FN2 modules.
- Nuclear Magnetic Resonance (NMR) spectroscopy to analyze peptide-construct interactions.
Main Results:
- Identified peptides with high aromatic residue content, lacking obvious sequence motifs or gelatin-like structures.
- Characterized interactions of two peptides (WHWRH0RIPLQLAAGR, THSHQWRHHQFPAPT) with MMP-2 FN2 constructs (Col-12, Col-23).
- NMR data revealed peptide binding perturbs residues in the gelatin-binding pocket and flexible regions, with association constants in the millimolar range.
Conclusions:
- Novel peptides interacting with MMP-2 FN2 modules were discovered using phage display.
- Peptide binding involves the gelatin-binding site and potentially affects protein dynamics.
- These findings provide a basis for developing MMP-2 modulators.