Component of the kinetochore, a multiprotein complex that assembles on centromeric DNA and attaches chromosomes to spindle microtubules, mediating chromosome segregation and sister chromatid segregation during meiosis and mitosis. Component of the inner kinetochore constitutive centromere-associated network (CCAN), which serves as a structural platform for outer kinetochore assembly (By similarity). Fta2, fta3 and fta4 associate with the central core (cnt) and inner repeat (inr) region of the centromere (PubMed:16079914). Component of the inner kinetochore constitutive centromere-associated network (CCAN) (also known as central kinetochore Sim4 complex in fission yeast), which is composed of at least cnl2, cnp3, cnp20, fta1, fta2, fta3, fta4, fta6, fta7, mal2, mhf1, mhf2, mis6, mis15, mis17, sim4 and wip1. Belongs to the CENP-H/MCM16 family.