Analysis of CDPK1 targets identifies a trafficking adaptor complex that regulates microneme exocytosis in .

Apicomplexan parasites use Ca-regulated exocytosis to secrete essential virulence factors from specialized organelles called micronemes. Ca-dependent protein kinases (CDPKs) are required for microneme exocytosis; however, the molecular events that regulate trafficking and fusion of micronemes with the plasma membrane remain unresolved. Here, we combine sub-minute resolution phosphoproteomics and bio-orthogonal labeling of kinase substrates in to identify 163 proteins phosphorylated in a CDPK1-dependent manner.

A positive feedback loop controls Toxoplasma chronic differentiation.

Successful infection strategies must balance pathogen amplification and persistence. In the obligate intracellular parasite Toxoplasma gondii this is accomplished through differentiation into dedicated cyst-forming chronic stages that avoid clearance by the host immune system. The transcription factor BFD1 is both necessary and sufficient for stage conversion; however, its regulation is not understood.

Analysis of CDPK1 targets identifies a trafficking adaptor complex that regulates microneme exocytosis in .

Apicomplexan parasites use Ca-regulated exocytosis to secrete essential virulence factors from specialized organelles called micronemes. Ca-dependent protein kinases (CDPKs) are required for microneme exocytosis; however, the molecular events that regulate trafficking and fusion of micronemes with the plasma membrane remain unresolved. Here, we combine sub-minute resolution phosphoproteomics and bio-orthogonal labeling of kinase substrates in to identify 163 proteins phosphorylated in a CDPK1-dependent manner.