Dissecting MMP P₁₀' and P₁₁' subsite sequence preferences, utilizing a positional scanning, combinatorial...

Area of Science:

• Biochemistry
• Molecular Biology
• Enzymology

Background:

• Matrix metalloproteinases (MMPs) are crucial zinc-dependent endopeptidases involved in extracellular matrix remodeling and cellular signaling.
• Dysregulated MMP activity contributes to various pathologies, including tumor metastasis, osteoarthritis, cardiovascular, and neurodegenerative diseases.
• Understanding MMP collagen sequence specificity is vital for developing targeted therapeutic strategies.

Purpose of the Study:

• To investigate the collagen sequence preferences of MMPs at the P10' and P11' substrate subsites.
• To develop selective MMP substrates for monitoring enzyme activity and facilitating drug delivery.
• To lay the groundwork for designing specific MMP inhibitors for disease intervention.

Main Methods:

• Synthesis of a positional scanning synthetic combinatorial library based on a triple-helical peptide mimic of collagen.
• Utilizing a Förster resonance energy transfer (FRET)-based enzyme activity assay to screen eight different MMPs.
• Deconvolution of library data to identify MMP-specific sequence motifs and discriminate between closely related MMPs.

Main Results:

• Distinct collagen sequence preferences were identified for several MMPs, allowing discrimination among closely related enzymes.
• A triple-helical substrate with Asp-Lys at P10'-P11' distinguished MMP-14 from MMP-15.
• Substrates with Asp-Lys or Trp-Lys at P10'-P11' differentiated MMP-2 from MMP-9.

Conclusions:

• The study successfully elucidated MMP collagen sequence preferences, enabling the design of selective substrates.
• These selective substrates hold potential for in vivo MMP activity monitoring and targeted drug delivery systems.
• The findings provide a basis for developing specific triple-helical peptide inhibitors against detrimental MMPs in various diseases.