Genome-Wide Identification and Evolutionary Analysis of Sarcocystis neurona Protein Kinases.
Abstract: The apicomplexan parasite Sarcocystis neurona causes equine protozoal myeloencephalitis (EPM), a degenerative neurological disease of horses. Due to its host range expansion, S. neurona is an emerging threat that requires close monitoring. In apicomplexans, protein kinases (PKs) have been implicated in a myriad of critical functions, such as host cell invasion, cell cycle progression and host immune response evasion. Here, we used various bioinformatics methods to define the kinome of S. neurona and phylogenetic relatedness of its PKs to other apicomplexans. We identified 97 putative PKs clustering within the various eukaryotic kinase groups. Although containing the universally-conserved PKA (AGC group), S. neurona kinome was devoid of PKB and PKC. Moreover, the kinome contains the six-conserved apicomplexan CDPKs (CAMK group). Several OPK atypical kinases, including ROPKs 19A, 27, 30, 33, 35 and 37 were identified. Notably, S. neurona is devoid of the virulence-associated ROPKs 5, 6, 18 and 38, as well as the Alpha and RIO kinases. Two out of the three S. neurona CK1 enzymes had high sequence similarities to Toxoplasma gondii TgCK1-α and TgCK1-β and the Plasmodium PfCK1. Further experimental studies on the S. neurona putative PKs identified in this study are required to validate the functional roles of the PKs and to understand their involvement in mechanisms that regulate various cellular processes and host-parasite interactions. Given the essentiality of apicomplexan PKs in the survival of apicomplexans, the current study offers a platform for future development of novel therapeutics for EPM, for instance via application of PK inhibitors to block parasite invasion and development in their host.
Publication Date: 2017-03-21 PubMed ID: 28335576PubMed Central: PMC5371900DOI: 10.3390/pathogens6010012Google Scholar: Lookup
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Summary
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The research paper focuses on the identification and examination of protein kinases (PKs) in the parasite Sarcocystis neurona, which causes a neurological disease in horses. These protein kinases have significant roles in the parasite’s invasiveness and development. Through the study, the researchers hope to better understand these roles and potentially develop new treatments for the disease.
Context and Motivation for the Research
- Sarcocystis neurona is a type of parasite from the Apicomplexan group. It is the cause of a degenerative neurological disease in horses called equine protozoal myeloencephalitis (EPM).
- The threat from this parasite is growing due to its expanding host range and as such, close monitoring of this parasite is needed.
- In Apicomplexan parasites, protein kinases (PKs) are known to play critical roles in various functions such as host cell invasion, cell cycle progression, and evasion of host immune response.
- The goal of this research is to identify and analyze the protein kinases present in S. neurona to understand their functions and use this information to develop potential medical treatments.
Methodology
- Various bioinformatics methods were used to define the kinome (the complete set of protein kinases) of S. neurona and to establish their evolutionary relatedness to PKs in other apicomplexan parasites.
- They identified 97 potential protein kinases in S. neurona, which belong to various eukaryotic kinase groups.
Key Findings
- While the universally-conserved PKA is present in the S. neurona kinome, it did not contain PKB and PKC.
- It did contain the six-conserved apicomplexan CDPKs, a group of calcium-regulated protein kinases.
- Several atypical kinases, including ROPKs 19A, 27, 30, 33, 35, and 37, were identified in S. neurona.
- Interestingly, S. neurona did not possess virulence-associated ROPKs 5, 6, 18, and 38, or Alpha and RIO kinases.
- Two of the three S. neurona CK1 enzymes had high similarities to Toxoplasma gondii TgCK1-α and TgCK1-β and the Plasmodium PfCK1.
Conclusion and Future Work Proposals
- Future experiments will be needed to validate the functional roles of the identified S. neurona PKs and to understand their involvement in mechanisms controlling cellular processes and host-parasite interactions.
- Given the critical roles of protein kinases in the survival of apicomplexan parasites, this research has the potential to pave the way for the development of novel treatments for EPM, possibly through the use of PK inhibitors to block invasion and development of the parasite in its host.
Cite This Article
APA
Murungi EK, Kariithi HM.
(2017).
Genome-Wide Identification and Evolutionary Analysis of Sarcocystis neurona Protein Kinases.
Pathogens, 6(1), 12.
https://doi.org/10.3390/pathogens6010012 Publication
Researcher Affiliations
- Department of Biochemistry and Molecular Biology, Egerton University, P.O. Box 536, 20115 Njoro, Kenya. edwin.murungi@egerton.ac.ke.
- Biotechnology Research Institute, Kenya Agricultural and Livestock Research Organization, P.O. Box 57811, Kaptagat Rd, Loresho, 00200 Nairobi, Kenya. henry.kariithi@kalro.org.
Conflict of Interest Statement
The authors declare that there is no conflict of interest in this work.
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Citations
This article has been cited 2 times.- Hammarton TC. Who Needs a Contractile Actomyosin Ring? The Plethora of Alternative Ways to Divide a Protozoan Parasite.. Front Cell Infect Microbiol 2019;9:397.
- Bowden GD, Land KM, O'Connor RM, Fritz HM. High-throughput screen of drug repurposing library identifies inhibitors of Sarcocystis neurona growth.. Int J Parasitol Drugs Drug Resist 2018 Apr;8(1):137-144.
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