A proteomic protocol to identify physiological substrates of pro-protein convertases

Area of Science:

• Biochemistry
• Molecular Biology
• Proteomics

Background:

• Proprotein convertases (PCs) are essential enzymes that activate proteins via proteolytic cleavage.
• Dysregulation of PC activity is implicated in various physiological and pathological processes, making them therapeutic targets.
• Identifying specific PC substrates in vivo remains a significant challenge in understanding PC function.

Purpose of the Study:

• To develop and validate a practical proteomics-based procedure for identifying novel physiological substrates of proprotein convertases.
• To apply this method to discover PC6 substrates during decidualization, a critical uterine process.

Main Methods:

• Utilized two-dimensional fluorescent differential gel electrophoresis (2D-DiGE) coupled with tandem mass spectrometry.
• Integrated standard molecular and biochemical techniques for substrate validation.
• Applied the method to study PC6 activity in the context of uterine decidualization.

Main Results:

• Successfully identified and validated novel substrates of proprotein convertase 6 (PC6).
• Demonstrated the utility of the developed proteomics approach in a specific physiological context (decidualization).

Conclusions:

• The described proteomics workflow provides a powerful and applicable strategy for discovering PC substrates in various cellular processes.
• This method advances the study of proprotein convertase biology and substrate identification.