Last update 08 May 2025

CDPK1

Basic Info

Synonyms-
Introduction
Calcium-dependent protein kinase which acts as a sensor and effector of intracellular Ca(2+) levels probably in part downstream of cGMP-activated PKG kinase (PubMed:18768477, PubMed:19307175, PubMed:28680058, PubMed:29716996). By phosphorylating various proteins, required for microneme secretion and thus merozoite egress from and invasion of host erythrocytes (PubMed:23204525, PubMed:28680058, PubMed:29716996). During gametogenesis, essential for the development of both male and female gametes (By similarity). Phosphorylates SERA5 p50 which enhances SERA5 p50 protease activity; however, SERA5 p50 protease activity has been shown in other studies to be controversial (PubMed:29716996). Probably by phosphorylating SERA5 p50, plays a role in merozoite egress from host erythrocytes (PubMed:29716996). Probably prior or during merozoite invasion of host erythrocytes, phosphorylates rhoptry protein RhopH3 which is required for RhopH3 localization to rhoptries and for its secretion (PubMed:33024030). Probably in late schizonts, phosphorylates myosin A tail domain-interacting protein MTIP and glideosome-associated protein 45 GAP45, both of which are components of the motor complex that generates the force required by the parasite to invade host cells (PubMed:18768477, PubMed:22539638, PubMed:28680058). In late schizonts, phosphorylates inner membrane complex protein IMC1g (PubMed:28680058). In late schizonts, phosphorylates PKA regulatory subunit PKAr in a calcium-dependent manner, which may contribute to the dissociation of regulatory PKAr and catalytic PKAc subunits and promote the activation of PKAc (PubMed:28680058). May phosphorylate raf kinase inhibitory protein RKIP which in turn may regulate CDPK1 catalytic activity (PubMed:17123645). May phosphorylate proteins of the host erythrocyte membranes (By similarity).

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