Regulates microtubule organization and stabilization. Promotes microtubule growth and bundling formation and stabilizes microtubules by increasing intense acetylation of microtubules (PubMed:26482847, PubMed:26485573). Both tubulin-binding and homodimer formation are required for NCKAP5L-mediated microtubule bundle formation (PubMed:26485573). Homodimer (PubMed:26482847). Interacts with CDK5RAP2 (PubMed:26485573). Interacts with MAPRE1 (PubMed:26485573). Interacts with beta-tubulin (PubMed:26482847). Localizes to microtubule plus ends (PubMed:26485573, PubMed:26482847). Associates with centrosomes during interphase, but dissociates from these structures from the onset of mitosis (PubMed:26549230). CDK1/Cyclin B-dependent phosphorylation mediates its dissociation from centrosomes during mitosis. Dubious isoform produced through intron retention. Dubious isoform produced through intron retention. Probable cloning artifact.