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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Medicine

Background:

  • A disintegrin and metalloprotease-17 (ADAM17) mediates proteolytic processing (shedding) of membrane proteins.
  • ADAM17 activity is vital for physiological processes but implicated in diseases like cancer and inflammation when dysregulated.
  • Phosphatidylserine (PS) flip to the outer cell membrane leaflet was recently identified as a trigger for ADAM17 shedding.

Purpose of the Study:

  • To investigate the regulatory mechanisms of ADAM17-mediated protein shedding.
  • To elucidate the role of catalytic domain positioning in ADAM17 activity.
  • To understand the interplay between PS binding and ADAM17 substrate accessibility.

Main Methods:

  • Investigated the intrinsic proteolytic activity of the ADAM17 catalytic domain.
  • Analyzed the effect of phosphatidylserine (PS) interaction on ADAM17 function.
  • Examined the spatial positioning of the ADAM17 catalytic domain relative to substrate cleavage sites.

Main Results:

  • The intrinsic proteolytic activity of the ADAM17 catalytic domain is essential and constantly present.
  • Phosphatidylserine (PS) binding to ADAM17 facilitates substrate cleavage by repositioning the catalytic domain.
  • The precise positioning of the catalytic domain towards cleavage sites is a critical regulatory step in ADAM17-mediated shedding.

Conclusions:

  • ADAM17 activity is tightly regulated at the cell surface through multiple layers.
  • Catalytic domain positioning, influenced by PS binding, is a key determinant of ADAM17 substrate accessibility and shedding.
  • Understanding these regulatory mechanisms is crucial for targeting ADAM17 in disease.