Component of the CENPA-HI complex, a centromeric complex involved in assembly of kinetochore proteins, mitotic progression and chromosome segregation. Required for the localization of CENPC but not CENPA to the centromere. It however may be involved in incorporation of newly synthesized CENPA into centromeres via its interaction with the CENPA-NAC complex. Component of the CENPA-HI complex, at least composed of CENPH, CENPI, CENPK, CENPL, CENPM, CENPO and CENPP. Localizes exclusively in the centromeres. Belongs to the CENP-I/CTF3 family.