Binds to the plus end of microtubules and regulates the dynamics of the microtubule cytoskeleton. Promotes microtubule growth and microtubule bundling. Links cytoplasmic vesicles to microtubules and thereby plays an important role in intracellular vesicle trafficking. Plays a role macropinocytosis and endosome trafficking. Interacts with MTOR; phosphorylates and regulates CLIP1. Interacts (via CAP-Gly domains) with tubulin. Interacts with SLAIN2. Interacts (via zinc finger) with DCTN1. Interacts with MAPRE1 and MAPRE3. Detected in dendritic cells. Highly expressed in the Reed-Sternberg cells of Hodgkin disease. 3 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.