{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n KIF1C is a kinesin‐3 family motor protein that functions in several interrelated cellular processes by linking microtubule‐based transport to the regulation of cytoskeletal dynamics and membrane trafficking. In primary human macrophages, KIF1C is enriched at microtubule plus‐ends where it targets regions of podosome turnover by interacting with nonmuscle myosin IIA, thereby coordinating actin remodeling and adhesion dynamics (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In developing neurons, KIF1C partners with BICDR-1 to control the pericentrosomal localization and trafficking of Rab6-positive secretory vesicles; this activity is tightly regulated during neurite outgrowth, as high levels of BICDR-1 early in development restrict anterograde transport and inhibit neuritogenesis, a constraint that is relieved when BICDR-1 expression declines (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Moreover, KIF1C directly binds the Golgi-associated Rab6A via both its motor domain and C-terminal regions, and this dual interaction is essential for maintaining Golgi integrity and efficient vesicle motility—loss of KIF1C function perturbs protein delivery to the cell surface and leads to Golgi fragmentation (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Its motor activity is further modulated by an autoinhibitory mechanism involving the interaction between its microtubule-binding surface and its stalk, with regulatory proteins such as PTPN21 and the cargo adapter Hook3 binding to relieve this inhibition and thereby stimulate vesicle transport (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " The performance of KIF1C-mediated transport is also influenced by the acetylation state of microtubules, which alters vesicle run length, velocity, and targeting frequency to podosomes (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " In addition to these cell biological roles, mutations in KIF1C have been implicated in neurodegenerative disorders: missense and truncating mutations in the motor domain have been linked to hereditary spastic paraparesis with cerebellar dysfunction in humans (see"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", and analogous loss-of-function alleles in cattle result in progressive ataxia accompanied by demyelinating lesions (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Finally, interactions identified via yeast two-hybrid screens—with proteins such as KBP—underscore an expanding network of regulators that modulate kinesin activity, reinforcing the emerging view that KIF1C serves as a critical nexus integrating cargo binding, motor regulation, and cytoskeletal cross-talk (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Petra Kopp, Reiner Lammers, Martin Aepfelbacher, et al. 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