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Phospholipase A2 at the bilayer interface.

F Ramirez1, M K Jain

  • 1Department of Chemistry, SUNY, Stony Brook 11794.

Proteins
|January 1, 1991
PubMed
Summary
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Enzymes acting on aggregated substrates, like phospholipase A2 (PLA2), catalyze reactions at interfaces. High-affinity binding to these interfaces, driven by ionic and hydrophobic interactions, is crucial for efficient interfacial catalysis.

Area of Science:

  • Biochemistry
  • Enzymology
  • Biophysics

Background:

  • Enzymes acting on amphipathic substrates often function at interfaces due to substrate aggregation in aqueous media.
  • Interfacial catalysis is influenced by the molecular organization and dynamics of the substrate-water interface.
  • Enzymes access substrates at the interface because monomer concentration in the aqueous phase is low.

Purpose of the Study:

  • To explore the factors governing the binding of pig pancreatic phospholipase A2 (PLA2) to bilayer interfaces.
  • To understand the kinetics and molecular mechanisms of interfacial catalysis by PLA2.
  • To adapt Michaelis-Menten kinetics to describe interfacial catalysis.

Main Methods:

  • Minireview of existing literature on interfacial catalysis and PLA2.

Related Experiment Videos

  • Analysis of enzyme-substrate interactions at the bilayer interface.
  • Kinetic analysis of PLA2 activity in different modes (scooting and hopping).

    • Main Results:

    • PLA2 binds to lipid bilayers through a combination of ionic and hydrophobic interactions.
    • The enzyme utilizes a hydrophobic collar and cationic residues for substrate access.
    • High-affinity binding (apparent dissociation constant < 0.1 pM on anionic vesicles) and catalytic interaction do not require protein aggregation or acylation.

    Conclusions:

    • Enzyme binding to the substrate interface is a critical step in interfacial catalysis, influencing processivity.
    • The kinetics of interfacial catalysis can be described by adapting Michaelis-Menten formalism.
    • PLA2 exhibits distinct binding and catalytic behaviors (scooting vs. hopping modes) at the interface.