This entry represents a N-terminal conserved region found in huntingtin-associated protein 1 (HAP1), trafficking Kinesin proteins TRAK1 and TRAK2 (vertebrate), Milton (Drosophila) and T27A3.1 (C. elegans) []. HAP1 binds to huntingtin in a polyglutamine repeat-length-dependent manner [, , ]. It is involved in intracellular trafficking []. HAP1 is also linked to Alzheimer's disease. It regulates amyloid precursor protein subcellular trafficking to the non-amyloidogenic pathway and may negatively regulate Abeta production in neurons [].TRAK1 binds to both kinesin-1 and dynein/dynactin, is prominently localized in axons, and is needed for normal axon outgrowth, whereas TRAK2 predominantly interacts with dynein/dynactin, is more abundantly present in dendrites, and is required for dendritic development [].
