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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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Actin Filament Depolymerization01:19

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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
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Generation of Straight or Branched Actin Filaments01:14

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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Cytoskeletal Linker Proteins - Plakins01:09

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Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
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Actin Polymerization01:42

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
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Functional insights into Plasmodium actin-depolymerizing factor interactions with phosphoinositides.

Devaki Lasiwa1, Inari Kursula2

  • 1Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland.

The Journal of Biological Chemistry
|June 21, 2025
PubMed
Summary
This summary is machine-generated.

Malaria parasites utilize unique actin regulators, Plasmodium actin-depolymerizing factors (ADFs), for motility. These ADFs interact with phosphoinositides, crucial for parasite invasion and survival.

Keywords:
Plasmodiumactin regulationactin-binding proteinanionic vesicleselectrostatic interactionintrinsic tryptophan fluorescence spectroscopyprotein–lipid interaction

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PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions
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Area of Science:

  • Molecular Parasitology
  • Cell Biology
  • Biochemistry

Background:

  • Malaria parasites (Plasmodium spp.) are protozoans requiring complex life cycles involving mosquitoes and vertebrates.
  • Parasite motility, essential for host cell invasion and egress, relies on the glideosome, an actomyosin motor complex.
  • Actin dynamics are regulated by actin-depolymerizing factors (ADFs), which are poorly conserved in Apicomplexa.

Purpose of the Study:

  • To investigate the interaction between Plasmodium ADFs and phosphoinositides.
  • To characterize the binding sites and affinities of Plasmodium ADFs for phosphoinositides.
  • To understand the functional implications of phosphoinositide binding on ADF structure.

Main Methods:

  • Biochemical assays to study protein-lipid interactions.
  • Biophysical techniques to analyze protein structure changes.
  • Phosphoinositide-binding assays using vesicles and micelles.
  • Mapping of phosphoinositide binding sites on Plasmodium ADF1.

Main Results:

  • Both Plasmodium ADF isoforms bind to distinct phosphoinositides.
  • Phosphoinositide binding requires the formation of membrane-like structures (vesicles or micelles).
  • Binding increases the alpha-helical content of Plasmodium ADFs, with micromolar affinities.
  • The binding site for phosphatidylinositol 4,5-bisphosphate on PfADF1 involves a positively charged surface patch.

Conclusions:

  • Plasmodium ADFs exhibit specific interactions with phosphoinositides, regulating their structure and function.
  • These interactions are critical for parasite motility and host cell invasion mechanisms.
  • Understanding these interactions provides potential targets for antimalarial drug development.