AKIT9

AKIT9 (PF3D7_1443100) is a component of the highly divergent apicomplexan kinetochore, identified as one of 13 previously unknown kinetochore proteins through interactomics combined with deep homology searches (PMID:36006241). Within this study the apicomplexan kinetochore was resolved into at least four discrete compartments with distinct biochemical interactions and subkinetochore localizations, and AKIT9 was assigned to this multi-compartment structure (PMID:36006241). Beyond its membership in the apicomplexan kinetochore (PMID:36006241), no specific enzymatic activity, AKIT9-exclusive binding partners, or direct functional characterization of PF3D7_1443100 has been established in the available corpus.

1. 2022 Medium

   The composition of the divergent apicomplexan kinetochore was largely unknown; identifying its full protein inventory was needed to understand chromosome segregation in these parasites, and this work placed AKIT9 among newly recognized kinetochore components.

   Evidence Interactomics (co-immunoprecipitation/proximity labeling) combined with deep homology searches and subkinetochore localization in P. falciparum, P. berghei, and T. gondii

   PMID:36006241

   Open questions at the time

   • No AKIT9-specific interaction partners or exclusive binding activity identified
   • No enzymatic or molecular activity assigned to AKIT9 itself
   • No functional perturbation (knockout/knockdown) or phenotype for AKIT9 established

• The specific molecular role of AKIT9 within the kinetochore, its direct binding partners, its compartment assignment, and its requirement for chromosome segregation remain uncharacterized.
• Which of the four kinetochore compartments AKIT9 occupies is not defined
• Whether AKIT9 is essential for kinetochore assembly or parasite viability is untested
• No structural model or direct binding partner unique to AKIT9 is known