Functions as an anchor sequestering components of the cAMP-dependent pathway to Golgi and/or centrosomes (PubMed:11134006). May participate in microtubule dynamics, promoting microtubule assembly, in an isoform-specific manner. 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 (By similarity). Interacts with PDE4D (PubMed:11134006). May interact with MAPRE1 and MAPRE3. May form a pericentrosomal complex with AKAP9, CDK5RAP2 and EB1/MAPRE1 in an isoform-specific manner; within this complex, may mediate MAPRE1-binding to CDK5RAP2. Interaction with AKAP9 stabilizes both proteins. May interact with CAMSAP2 in an isoform-specific manner; this interaction is much stronger in the presence of AKAP9. In complex with AKAP9, recruits CAMSAP2 to the Golgi apparatus. May interact with unglycosylated LGALS3BP in an isoform-specific manner; 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. Abundantly expressed in heart and skeletal muscle and to a lower extent in brain, lung and liver. Expressed in heart, skeletal muscle and testis (at protein level).