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Phospholipases: structural and functional motifs for working at an interface

M F Roberts1

  • 1Boston College, Merkert Chemistry Center, Chestnut Hill, Massachusetts 02167, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|August 1, 1996
PubMed
Summary

Phospholipases are enzymes that break down phospholipids, acting as crucial regulators in cell signaling. Recent structural studies reveal their interfacial catalysis mechanisms and complex regulatory interactions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Phospholipases are ubiquitous enzymes catalyzing phospholipid hydrolysis, producing second messengers vital for cellular regulation.
  • Diverse secreted and cytoplasmic phospholipases exist, each with distinct substrate specificities and regulatory mechanisms.
  • Understanding phospholipase function is critical for deciphering cellular signal transduction pathways.

Purpose of the Study:

  • To review recent structural and functional insights into phospholipase activity at interfaces.
  • To highlight the molecular mechanisms underlying phospholipase-catalyzed phospholipid hydrolysis.
  • To explore the complex regulatory networks involving proteins, lipids, and ions that control phospholipase function.

Main Methods:

  • Analysis of solution structures of pancreatic phospholipase A2.

Related Experiment Videos

  • Examination of crystal structures of bacterial phosphatidylinositol-phospholipase C.
  • Investigation of Ca2+ lipid binding domains and their homology to cytoplasmic phospholipases.
  • Review of regulatory mechanisms involving G-proteins, effector lipids (PIP2), and Ca2+.

    • Main Results:

    • Structural data provide molecular-level views of interfacial catalysis for various phospholipases.
    • The active site of bacterial phosphatidylinositol-phospholipase C shares similarities with ribonuclease.
    • Ca2+ lipid binding domains model protein-membrane interactions for cytoplasmic phospholipases.
    • Complex regulatory interactions involving proteins and lipids modulate phospholipase activity.

    Conclusions:

    • Structural information is key to understanding phospholipase interfacial catalysis.
    • Phospholipases are intricately regulated by a combination of protein, lipid, and ion interactions.
    • Further deconvolution of these interactions is necessary to fully elucidate their roles in signal transduction.