Adapter protein which binds to its partners, usually via a phosphoserine or phosphothreonine motif (PubMed:23308157, PubMed:32484216, PubMed:32817103). Binding generally results in the modulation of the activity and/or cellular localization of the binding partner (Probable). Via its interaction with CDPK1 and PKAr, involved in merozoite microneme secretion and thus in merozoite invasion of host erythrocytes (PubMed:32817103). Homodimer (Probable). Forms a complex composed of CDPK1, PKA regulatory subunit PKAr and 14-3-3I; the complex is formed in merozoites in response to low extracellular level of K(+) and may play a role in microneme secretion (PubMed:32817103). Interacts with CDPK1 (when phosphorylated) in a Ca(2+)-independent manner; the interaction does not regulate CDPK1 catalytic activity but is required for merozoite invasion of host erythrocytes (PubMed:32484216, PubMed:32817103). Interacts with PKA regulatory subunit PKAr (when phosphorylated) in a Ca(2+)-dependent manner (PubMed:32817103). Interacts with histone H3 (when phosphorylated at 'Ser-28' or when phosphorylated at 'Ser-28' and 'Ser-32') (PubMed:23308157). Expressed during parasite asexual blood stages, at the ring, trophozoite and schizont stages and in free merozoites (at protein level). Belongs to the 14-3-3 family.