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Related Concept Videos

Introduction to Actin01:26

Introduction to Actin

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Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across...
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Actin Polymerization and Cell Motility01:13

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
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Related Experiment Video

Updated: Feb 25, 2026

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Characterisation of Encephalitozoon cuniculi α-actinin.

Linda Sandblad1, Lars Backman2

  • 1Department of Chemistry, Umeå University, Umeå SE-90 187, Sweden; SciLifeLab in Umeå University, Umeå SE-90 187, Sweden; Molecular Infection Medicine in Sweden (MIMS), Umeå SE-90 187, Sweden.

Molecular and Biochemical Parasitology
|February 23, 2026
PubMed
Summary

Encephalitozoon cuniculi, a microsporidian parasite, possesses an alpha-actinin-like protein crucial for organizing its actin cytoskeleton. This protein functions similarly to canonical alpha-actinins, highlighting the importance of actin organization for parasite survival.

Keywords:
Actin cytoskeletonActin-binding proteinsEncephalitozoon cuniculiMicrosporidiaα-actinin

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Area of Science:

  • Parasitology
  • Cell Biology
  • Molecular Biology

Background:

  • Encephalitozoon cuniculi is an obligate intracellular parasite with a reduced genome.
  • Despite genome reduction, it retains components of an actin cytoskeleton.

Purpose of the Study:

  • To characterize the alpha-actinin-like protein from E. cuniculi.
  • To understand its role in actin organization within the parasite.

Main Methods:

  • Recombinant protein expression and purification.
  • Gel filtration, actin co-sedimentation assays, and electron microscopy.
  • AlphaFold structural modeling.

Main Results:

  • The E. cuniculi protein exhibits typical alpha-actinin domains (actin-binding, rod, calmodulin-like).
  • It forms stable dimers and cross-links actin filaments into bundles.
  • The actin-binding domain alone binds but does not cross-link filaments.
  • Structural modeling supports an antiparallel dimer arrangement.

Conclusions:

  • The characterized protein is a true alpha-actinin homologue.
  • The presence of functional actin-binding proteins suggests a vital role for the actin cytoskeleton in microsporidian survival.