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Identification of mRNA 5' cap-associated proteins in the human malaria parasite Plasmodium falciparum

Chayaphat Wongsombat1, Yodying Yingchutrakul2, Nattida Suwanakitti1

  • 1National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Thailand.

Molecular and Biochemical Parasitology
|December 10, 2021
PubMed

Insights

Researchers identified proteins associated with messenger RNA (mRNA) 5' cap binding in the malaria parasite Plasmodium falciparum. Enolase was surprisingly found to associate with the mRNA cap, though not directly.

Area of Science:

  • Molecular Biology
  • Parasitology
  • Proteomics

Background:

  • Eukaryotic messenger RNA (mRNA) translation relies on a 5' cap-dependent initiation mechanism.
  • Understanding translation initiation proteins in eukaryotic parasites like Plasmodium falciparum is crucial but experimentally limited.

Purpose of the Study:

  • To identify proteins associated with the 5' cap of mRNA in Plasmodium falciparum.
  • To investigate the role of these proteins in translation initiation within the malaria parasite.

Main Methods:

  • Utilized a 5' cap affinity matrix to enrich native proteins from asexual stage P. falciparum parasites.
  • Performed proteomic analysis on the enriched protein eluates to identify 5' cap-associated proteins.

Main Results:

  • The canonical 5' cap-binding protein eukaryotic initiation factor 4E (eIF4E) was the most reproducibly enriched protein.
  • Other translation initiation factors, eIF4A and eIF4G, were detected but with low reproducibility.
  • Enolase (ENO) was unexpectedly the second most enriched protein, but recombinant ENO showed no direct 5' cap binding activity.

Conclusions:

  • Identified key proteins involved in mRNA 5' cap binding in P. falciparum, including eIF4E.
  • Suggests an indirect association of enolase with the mRNA 5' cap, warranting further investigation into its function in parasite translation.
Keywords:
Cap-binding proteinMalariaPlasmodium falciparumProteomic analysiseIF4E

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