Investigating substrate binding mechanism in prolyl oligopeptidase through molecular dynamics

Area of Science:

• Biochemistry and Molecular Biology
• Neuroscience
• Computational Biology

Background:

• Prolyl oligopeptidase (PREP) is implicated in neurodegenerative diseases via interactions with amyloid proteins like alpha-synuclein and Tau.
• Understanding substrate-binding dynamics in PREP's catalytic pocket is crucial but less explored than its protein-protein interactions.

Purpose of the Study:

• To investigate the substrate-binding dynamics within the catalytic pocket of Prolyl oligopeptidase (PREP).
• To explore the functional versatility of PREP using computational methods.

Main Methods:

• Employed molecular docking and molecular dynamics simulations.
• Analyzed the behavior of known PREP substrates, including thyrotropin-releasing hormone (TRH).
• Evaluated the potential of the TRH precursor as a substrate.

Main Results:

• Simulations revealed that TRH transitions between three preferred binding regions within the PREP pocket.
• One identified binding region is favorable for catalytic activity.
• Findings suggest a dynamic substrate-processing mechanism rather than a single fixed binding site.

Conclusions:

• Computational methods are valuable for analyzing protein dynamics and enzymatic mechanisms.
• The dynamic binding of substrates like TRH offers insights into PREP's functional versatility.
• This research contributes to understanding PREP's role in neurodegenerative disease pathways.