NCKAP5L regulates microtubule organization and stabilization. Promotes microtubule growth and bundling formation and stabilizes microtubules by increasing intense acetylation of microtubules. Both tubulin-binding and homodimer formation are required for NCKAP5L-mediated microtubule bundle formation. [taken from the Universal Protein Resource (UniProt) www.uniprot.org/uniprot/Q9HCH0].