Structural and functional properties of meprin β metalloproteinase with regard to cell signaling

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Meprin β is a metalloproteinase involved in collagen deposition, mucus detachment, and cell surface protein regulation.
• Key substrates include IL-6R, TREM2, CD99, APP, and CD109.
• Regulation of meprin β activity and release is crucial for its function.

Purpose of the Study:

• To summarize factors influencing meprin β activity and proteolytic function.
• To discuss meprin β-mediated cleavage of IL-6R, TREM2, and CD109.
• To review the role of proteases, particularly meprin β, in substrate release via extracellular vesicles.

Main Methods:

• Literature review and summary of existing research on meprin β.
• Analysis of meprin β's proteolytic activity on various substrates.
• Discussion of meprin β's involvement in extracellular vesicle biology.

Main Results:

• Meprin β activity is modulated by various factors, affecting its proteolytic function.
• Cleavage of IL-6R and TREM2 occurs on the cell surface.
• CD109 is cleaved within its protein core, releasing fragments from the cell surface.

Conclusions:

• Meprin β plays a significant role in regulating cell surface protein abundance and function.
• Proteases, including meprin β, are implicated in the release of substrates via extracellular vesicles.
• Further research into meprin β regulation is warranted for understanding its physiological and pathological roles.