alexa Phosphoproteomics reveals malaria parasite Protein Kinase G as a signalling hub regulating egress and invasion.
Infectious Diseases

Infectious Diseases

Journal of Clinical Infectious Diseases & Practice

Author(s): Alam MM, Solyakov L, Bottrill AR, Flueck C, Siddiqui FA,

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Abstract Our understanding of the key phosphorylation-dependent signalling pathways in the human malaria parasite, Plasmodium falciparum, remains rudimentary. Here we address this issue for the essential cGMP-dependent protein kinase, PfPKG. By employing chemical and genetic tools in combination with quantitative global phosphoproteomics, we identify the phosphorylation sites on 69 proteins that are direct or indirect cellular targets for PfPKG. These PfPKG targets include proteins involved in cell signalling, proteolysis, gene regulation, protein export and ion and protein transport, indicating that cGMP/PfPKG acts as a signalling hub that plays a central role in a number of core parasite processes. We also show that PfPKG activity is required for parasite invasion. This correlates with the finding that the calcium-dependent protein kinase, PfCDPK1, is phosphorylated by PfPKG, as are components of the actomyosin complex, providing mechanistic insight into the essential role of PfPKG in parasite egress and invasion.
This article was published in Nat Commun and referenced in Journal of Clinical Infectious Diseases & Practice

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