Component of the SKA1 complex, a microtubule-binding subcomplex of the outer kinetochore that is essential for proper chromosome segregation (PubMed:19289083, PubMed:19360002, PubMed:23085020). The SKA1 complex is a direct component of the kinetochore-microtubule interface and directly associates with microtubules as oligomeric assemblies (PubMed:19289083, PubMed:19360002). The complex facilitates the processive movement of microspheres along a microtubule in a depolymerization-coupled manner (PubMed:19289083). In the complex, it mediates the microtubule-stimulated oligomerization (PubMed:19289083). Affinity for microtubules is synergistically enhanced in the presence of the ndc-80 complex and may allow the ndc-80 complex to track depolymerizing microtubules (PubMed:23085020). Component of the SKA1 complex, composed of SKA1, SKA2 and SKA3 (PubMed:19289083, PubMed:19360002). The core SKA1 complex is composed of 2 SKA1-SKA2 heterodimers, each heterodimer interacting with a molecule of the SKA3 homodimer (PubMed:19289083, PubMed:19360002). The core SKA1 complex associates with microtubules and forms oligomeric assemblies (PubMed:19289083, PubMed:19360002, PubMed:23085020). Interacts with SKA1; the interaction is direct (PubMed:19289083, PubMed:23085020). Localizes to the outer kinetochore and spindle microtubules during mitosis in a NDC80 complex-dependent manner. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay. Belongs to the SKA3 family. Wrong choice of frame. Truncated N-terminus.