A novel multi-domain mucin-like glycoprotein of Cryptosporidium parvum mediates invasion

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Studying Cryptosporidium Infection in 3D Tissue-derived Human Organoid Culture Systems by Microinjection
05:31

Studying Cryptosporidium Infection in 3D Tissue-derived Human Organoid Culture Systems by Microinjection

Published on: September 14, 2019

D A Barnes1, A Bonnin, J X Huang

  • 1Department of Medicine, University of California-San Francisco General Hospital, 94110, USA.

Molecular and Biochemical Parasitology
|December 16, 1998
PubMed

Insights

Cryptosporidium parvum uses the GP900 glycoprotein to invade host cells. Targeting GP900 may offer new treatments for cryptosporidiosis, a disease lacking effective therapies.

Area of Science:

  • Parasitology
  • Molecular Biology
  • Immunology

Background:

  • Cryptosporidium parvum causes severe diarrhea, especially in immunocompromised individuals.
  • No effective treatments currently exist for cryptosporidiosis.
  • The basic biology of C. parvum remains poorly understood.

Purpose of the Study:

  • To characterize the GP900 glycoprotein of Cryptosporidium parvum.
  • To investigate the role of GP900 in parasite invasion.
  • To explore GP900 as a potential therapeutic target.

Main Methods:

  • Cloning and sequence analysis of the GP900 gene.
  • Protein structure prediction and domain analysis.
  • In vitro invasion inhibition assays using native and recombinant GP900.

Main Results:

  • GP900 is a large, mucin-like glycoprotein with cysteine-rich and polythreonine domains.
  • The polythreonine domains are encoded by ACA trinucleotide repeats.
  • GP900 is stored in micronemes and present on invasive parasite forms.
  • GP900 effectively inhibits parasite invasion in vitro, with low picomolar and nanomolar IC50 values for native and recombinant forms, respectively.

Conclusions:

  • GP900 functions as a parasite ligand mediating host cell attachment and invasion.
  • GP900 represents a promising target for developing novel immunotherapies or chemotherapies against cryptosporidiosis.

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