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forkhead associated (FHA) domain found in the kinesin-like protein KIF13 family The KIF13 family includes KIF13A and KIF13B. KIF13A, also called kinesin-like protein RBKIN, is a plus end-directed microtubule-dependent motor protein involved in intracellular transport and in regulating various processes such as mannose-6-phosphate receptor (M6PR) transport to the plasma membrane, endosomal sorting during melanosome biogenesis, and cytokinesis. It mediates the transport of M6PR-containing vesicles from trans-Golgi network to the plasma membrane via direct interaction with the AP-1 complex. During melanosome maturation, KIF13A is required for delivering melanogenic enzymes from recycling endosomes to nascent melanosomes by creating peripheral recycling endosomal subdomains in melanocytes. It is also required for the abscission step in cytokinesis: it mediates translocation of ZFYVE26, and possibly TTC19, to the midbody during cytokinesis. KIF13B, also called kinesin-like protein GAKIN, is a novel kinesin-like protein that associates with the human homolog of the Drosophila discs large tumor suppressor in T lymphocytes. It is involved in reorganization of the cortical cytoskeleton. It regulates axon formation by promoting the formation of extra axons. KIF13B may be functionally important for the intracellular trafficking of membrane-associated guanylate kinase homologs (MAGUKs) and associated protein complexes. The FHA domain is a small phosphopeptide recognition module, but this group may lack the conserved residues that are required for binding phosphothreonine. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",