Involved in microtubule stabilization in many cell types, including neuronal cells (By similarity). Specifically has microtubule cold stabilizing activity (By similarity). Involved in dendrite morphogenesis and maintenance by regulating lysosomal trafficking via its interaction with TMEM106B . Regulates KIF5A-mediated axonal cargo transport (By similarity). Regulates axonal growth during neuron polarization (By similarity).
Subcellular locations: Cytoplasm, Cytoskeleton, Golgi apparatus, Cell projection, Axon, Cell projection, Dendrite, Cytoplasmic vesicle, Secretory vesicle membrane
Localizes predominantly in the proximal part of the axon (By similarity). Preferentially is concentrated on a portion of the microtubule polymer in which tubulin is modified by detyrosination and acetylation and is also resistant to depolymerization induced by both nocodazole and cold (By similarity). In unpolarized neurons, localizes to the Golgi and to secretory vesicles accumulating transiently at the tips of a subset of neurites (By similarity). Following neuronal polarization and during axon outgrowth, accumulates in the axonal growth cone and subsequently localizes throughout the axon (By similarity). Partially localizes to dendrites in mature neurons (By similarity). Colocalizes with neurofilament (NF)-rich inclusions in spinal cord and brain neurons of patients with amyotrophic lateral sclerosis (ALS) .
Expressed in brain (at protein level). Expressed in spinal cord. Isoform 2 expression is up-regulated in the prefrontal cortex (Brodmann's area 46) of patients with schizophrenia (postmortem brain study).