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Updated: Nov 18, 2025
Author Spotlight: Identifying Compensatory Pathways in Malaria Parasites Containing Hypomorphic Allele of Essential Protein Kinases
Published on: November 22, 2024
PfSRPK1, a novel splicing-related kinase from Plasmodium falciparum
Aparna Dixit1, Prashant K Singh, Guru Prasad Sharma
1Eukaryotic Gene Expression Laboratory, National Institute of Immunology, New Delhi 110067, India.
Abstract:
Even though it is increasingly evident that post-transcriptional events like mRNA processing and splicing may regulate gene expression and proteome diversity of malaria parasite Plasmodium, molecular mechanisms that regulate events like mRNA splicing in malaria parasite are poorly understood. Protein kinases control a wide variety of cellular events in almost all eukaryotes, including modulation of mRNA splicing, transport, and stability. We have identified a novel splicing-related protein kinase from Plasmodium falciparum, PfSRPK1. PfSRPK1 when incubated with parasite nuclear extracts inhibited RNA splicing, suggesting that it may control mRNA splicing in the parasite. PfSR1, a putative splicing factor from P. falciparum, was identified as a substrate of PfSRPK1. PfSR1 interacts with RNA and PfSRPK1 modulates its RNA binding. Early in the parasite development, PfSRPK1 and PfSR1 are present in the nucleus. These studies provide useful insights into the function of two potentially key components of P. falciparum mRNA splicing machinery.
Insights
Researchers discovered a novel protein kinase, PfSRPK1, that regulates mRNA splicing in the malaria parasite Plasmodium falciparum. This finding offers insights into the parasite's gene expression machinery.
Area of Science:
- Molecular biology
- Parasitology
- Biochemistry
Background:
- Post-transcriptional modifications, including mRNA splicing, are crucial for gene expression and proteome diversity in the malaria parasite Plasmodium.
- The molecular mechanisms governing mRNA splicing in Plasmodium remain largely uncharacterized.
- Protein kinases play diverse roles in eukaryotic cellular processes, including the regulation of mRNA metabolism.
Purpose of the Study:
- To identify and characterize novel components of the mRNA splicing machinery in Plasmodium falciparum.
- To investigate the role of protein kinases in regulating mRNA splicing in this parasite.
- To elucidate the function of a newly identified splicing-related protein kinase and its substrate.
Main Methods:
- Identification of a novel protein kinase, PfSRPK1, from Plasmodium falciparum.
- In vitro assays using parasite nuclear extracts to assess the effect of PfSRPK1 on RNA splicing.
- Identification of PfSR1, a putative splicing factor, as a substrate of PfSRPK1.
- Analysis of PfSR1's RNA-binding capabilities and the effect of PfSRPK1 on this interaction.
- Subcellular localization studies of PfSRPK1 and PfSR1 during parasite development.
Main Results:
- A novel splicing-related protein kinase, PfSRPK1, was identified in Plasmodium falciparum.
- Incubation of PfSRPK1 with parasite nuclear extracts demonstrated inhibition of RNA splicing.
- PfSR1, a putative splicing factor, was identified as a substrate of PfSRPK1.
- PfSRPK1 was shown to modulate the RNA-binding activity of PfSR1.
- Both PfSRPK1 and PfSR1 were localized to the nucleus during early parasite development.
Conclusions:
- PfSRPK1 is a key regulator of mRNA splicing in Plasmodium falciparum.
- PfSR1 is a functional substrate of PfSRPK1, and their interaction impacts RNA binding.
- These findings provide critical insights into the molecular mechanisms of mRNA splicing in malaria parasites.
- The identified components, PfSRPK1 and PfSR1, are potentially vital elements of the P. falciparum mRNA splicing machinery.
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