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Functional characterization of CpADF, an actin depolymerizing factor protein in Cryptosporidium parvum

Xiaotian Zhang1,2,3, Luyang Wang1,2,3, Ruiying Feng1,2,3

  • 1College of Veterinary Medicine, Henan Agricultural University, No. 15 Longzihu University Area, Zhengdong New District, Zhengzhou, 450046, People's Republic of China.

Parasitology Research
|September 7, 2023
PubMed

Insights

Researchers investigated Actin Depolymerizing Factor (ADF) in Cryptosporidium parvum, a parasite causing severe diarrhea. They found CpADF depolymerizes F-actin, suggesting a role in parasite invasion.

Area of Science:

  • Parasitology
  • Molecular Biology
  • Cell Biology

Background:

  • Cryptosporidium parvum is a significant waterborne protozoan pathogen causing diarrhea in humans and animals.
  • Apicomplexan parasite invasion relies on gliding motility, dependent on microfilaments.
  • Actin Depolymerizing Factor (ADF) regulates microfilament dynamics, but its role in C. parvum is uncharacterized.

Purpose of the Study:

  • To characterize the biological functions of Actin Depolymerizing Factor (ADF) in Cryptosporidium parvum (CpADF).

Main Methods:

  • Bioinformatic analysis identified CpADF with an ADF-H domain.
  • Gene expression analysis showed peak expression at 12 hours post-infection.
  • Immunolocalization revealed CpADF localization in oocysts, sporozoites, and merozoites.
  • Western blot and actin sedimentation assays assessed CpADF's interaction with F-actin.

Main Results:

  • CpADF is a 135-amino acid protein encoded by cgd5_2800.
  • CpADF expression peaks 12 hours post-infection and localizes to key parasite stages.
  • Anti-CpADF serum showed 41.30% neutralization efficiency.
  • CpADF depolymerizes F-actin in a pH-independent manner without co-sedimentation.

Conclusions:

  • CpADF possesses F-actin depolymerizing activity, crucial for microfilament regulation.
  • These findings provide a foundation for understanding CpADF's role in C. parvum invasion mechanisms.
Keywords:
Actin depolymerizing factorCryptosporidium parvumDepolymerizationInvasion

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