Structure of recombinant mouse collagenase-3 (MMP-13).

Area of Science:

• Biochemistry
• Structural Biology
• Enzymology

Background:

• Matrix metalloproteinases (MMPs) are critical enzymes involved in extracellular matrix degradation.
• Collagenase-3 (MMP-13) specifically cleaves type II collagen, cartilage, fibronectin, and aggrecan.
• MMP-13 is endogenously expressed in bone development and implicated in diseases like osteoarthritis and cancer.

Purpose of the Study:

• To determine the high-resolution crystal structure of the catalytic domain of mouse collagenase-3 (MMP-13).
• To elucidate the structural basis for MMP-13 substrate specificity and inhibitor interactions.
• To provide insights for the rational design of specific MMP-13 inhibitors.

Main Methods:

• X-ray crystallography was employed to determine the structure of recombinant mouse MMP-13 catalytic domain.
• The structure was solved at 2.0 Å resolution using molecular replacement and weak phasing.
• The enzyme was crystallized in complex with the hydroxamate inhibitor RS-113456.

Main Results:

• The crystal structure reveals atomic details of the catalytic domain, including interactions with the bound inhibitor.
• Key interactions involve the active site's atomic zinc ion and a voluminous hydrophobic P1' group of the inhibitor, crucial for potency.
• The structure highlights the enzyme's active site architecture, explaining its substrate specificity.

Conclusions:

• The determined structure provides a detailed understanding of MMP-13's active site and inhibitor binding.
• This structural information is vital for developing selective MMP-13 inhibitors for therapeutic applications.
• Targeting MMP-13 could offer new treatment strategies for diseases involving excessive matrix degradation.