Involved in the transport of early endosomes at the level of transition between microfilament-based and microtubule-based movement (By similarity). May be involved in the cytoskeletal organization of neuronal growth cones. Seems to be inactive as a PPIase. Interacts with WIP and actin (By similarity). Interacts with TBC1D23 (PubMed:29084197). Present in axons and neuronal growth cones. Expressed in brain, with highest levels in the granular cell layer of cerebellum and in the granule cell layer of dentate gyrus. Strongly expressed in the developing nervous system at 18.5 dpc. Present in brain, heart, lung, kidney and thymus at 18.5 dpc (at protein level). The PPIase FKBP-type domain seems to be inactive both for FK506-binding and enzymatic activity. The central coiled-coil region is responsible for association with early endosomes. Belongs to the FKBP-type PPIase family.