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Scramblases as Regulators of Proteolytic ADAM Function.

Karina Reiss1, Sinje Leitzke1, Jana Seidel1

  • 1Department of Dermatology, University of Kiel, 24105 Kiel, Germany.

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|February 25, 2022
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Phospholipid scramblases may activate ADAM proteases by exposing phosphatidylserine (PS) on the cell surface. This mechanism is crucial for regulating cell surface protein shedding and has implications for immunity, infection, and cancer.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Proteolytic ectodomain shedding regulates cell surface protein function.
  • ADAM10 and ADAM17 are key sheddases with low basal activity, upregulated by inside-out signaling.
  • The plasma membrane plays a critical role in sheddase activity regulation.

Purpose of the Study:

  • To explore the role of the plasma membrane in ADAM10 and ADAM17 activation.
  • To investigate the involvement of phospholipid scramblases in sheddase function.
  • To propose a model where scramblase-dependent phosphatidylserine (PS) externalization activates ADAM proteases.

Main Methods:

  • Review and synthesis of current knowledge on cell membrane dynamics and protease activity.
  • Discussion of emerging evidence linking phospholipid scramblases to sheddase regulation.
  • Conceptual framework development based on existing data.

Main Results:

  • Phospholipid scramblases are identified as potential central regulators of sheddase activity.
  • Scramblase-mediated externalization of phosphatidylserine (PS) is proposed as a key step in ADAM10 and ADAM17 activation.
  • The interplay between membrane changes, PS exposure, and protease activity is highlighted.

Conclusions:

  • Scramblases may be essential for the final activation step of ADAM10 and ADAM17.
  • This novel concept of scramblase regulation of ADAM proteases could extend to other cell surface proteins.
  • Understanding this mechanism has potential implications for immune response, infection, and cancer.