Functions as an anchor sequestering components of the cAMP-dependent pathway to Golgi and/or centrosomes (By similarity). Participates in microtubule dynamics, promoting microtubule assembly. Depending upon the cell context, may act at the level of the Golgi apparatus or that of the centrosome. In complex with AKAP9, recruits CAMSAP2 to the Golgi apparatus and tethers non-centrosomal minus-end microtubules to the Golgi, an important step for polarized cell movement. In complex with AKAP9, EB1/MAPRE1 and CDK5RAP2, contributes to microtubules nucleation and extension from the centrosome to the cell periphery, a crucial process for directed cell migration, mitotic spindle orientation and cell-cycle progression. Interacts with PDE4D (By similarity). Isoform 2 interacts with MAPRE1 and MAPRE3. Isoform 2 forms a pericentrosomal complex with AKAP9, CDK5RAP2 and EB1/MAPRE1; within this complex, may mediate MAPRE1-binding to CDK5RAP2. Interaction with AKAP9 stabilizes both proteins. Isoform 2 interacts (via N-terminus) with CAMSAP2; this interaction is much stronger in the presence of AKAP9. In complex with AKAP9, Isoform 2 recruits CAMSAP2 to the Golgi apparatus. Isoform 2 interacts with unglycosylated LGALS3BP; this interaction may connect the pericentrosomal complex to the gamma-tubulin ring complex (gamma-TuRC) to promote microtubule assembly and acetylation (By similarity). Associated with the microtubule network at the growing distal tip of microtubules. Targeting to the Golgi apparatus requires AKAP9. Residues 1-150 are involved in AKAP9-binding. Contaminating sequence. Potential poly-A sequence. Extended N-terminus.