Part of an astrin (SPAG5)-kinastrin (SKAP) complex containing SKAP, SPAG5, PLK1, DYNLL1 and SGOL2. Interacts with SPAG5 (By similarity). Directly binds to microtubules, although at relatively low affinity (By similarity). Interacts with CENPE; this interaction greatly favors microtubule-binding (By similarity).