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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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Related Experiment Video

Updated: Feb 22, 2026

A Liposome Membrane Permeability Assay for Investigating the Effects of Phosphatidylinositol Phosphate Groups on Membranotropic Action of Venom PLA2
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A Liposome Membrane Permeability Assay for Investigating the Effects of Phosphatidylinositol Phosphate Groups on Membranotropic Action of Venom PLA2

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Spider's venom phospholipases D: A structural review.

Rehana Masood1, Kifayat Ullah2, Hamid Ali2

  • 1Department of Biochemistry, Shaheed Benazir Bhutto Women University, Peshawar, 25000, Pakistan.

International Journal of Biological Macromolecules
|September 28, 2017
PubMed
Summary

Spider venoms contain phospholipases D (PLDs), crucial enzymes studied for their structure and function. This review details their structural features, catalytic mechanisms, and inhibition, offering insights into venom complexity.

Keywords:
CatalysisClass I and class II PLDsCrystal structuresInhibitionSpider’s venom phospholipases D (SVPLDs)Structural comparisonStructure based mechanism of maturationSuramin

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Spider venoms are complex biological mixtures containing numerous bioactive molecules.
  • Phospholipases D (PLDs) are a major protein component in spider venoms and are extensively studied.
  • PLDs are classified into two main groups, Class I and Class II, based on structural characteristics.

Purpose of the Study:

  • To review the structural features of spider venom PLDs.
  • To elucidate the structure-based mechanisms of catalysis employed by these enzymes.
  • To discuss the processes of PLD maturation and inhibition, including the use of synthetic inhibitors.

Main Methods:

  • Analysis of available crystal structures from the Protein Data Bank (PDB).
  • Examination of the triosephosphate isomerase (TIM) barrel fold common to PLDs.
  • Review of literature on enzyme catalysis, maturation, and inhibition studies.

Main Results:

  • Spider venom PLDs share a conserved triosephosphate isomerase (TIM) barrel fold, comprising eight α-helices and eight β-strands.
  • These enzymes utilize a general acid-base catalysis mechanism for substrate hydrolysis.
  • Structural insights facilitate understanding of enzyme maturation and the development of synthetic inhibitors.

Conclusions:

  • The structural and mechanistic understanding of spider venom PLDs is advancing.
  • Structural data is key to deciphering PLD function and developing targeted inhibitors.
  • Further research into PLD structure-function relationships can reveal novel biotechnological applications.