Microtubule-associated protein with the capacity to bundle and stabilize microtubules. May associate with chromosomes and promote the organization of meiotic or mitotic spindle microtubules around them (By similarity). Interacts with DNA, microtubules, ipo7, kpna2 and kpnb1. Microtubule stabilization is inhibited by ipo7 and kpna2, while microtubule bundling is inhibited by kpnb1. Active GTP-bound ran causes dissociation of ipo7 and kpnb1 (By similarity). Associates with meiotic or mitotic spindle microtubules, particularly in the vicinity of chromosomes. Belongs to the NUSAP family.