HIP1_clath_bdg is the coiled-coil region of Huntington-interacting proteins 1. It carries a highly conserved HADLLRKN sequence motif at its N-terminus which effects the binding of HIP1R to clathrin light-chain EED regulatory site. this binding then stimulates clathrin lattice assembly. Huntingtin-interacting protein 1 (HIP1) is an obligate binding partner for Huntungtin, and loss of this interaction triggers the cascade of events that results in the apoptosis of neuronal cells and the onset of Hungtinton's disease [1]. Clathrin light-chain binds to a flexible coiled-coil domain in HIP1 and induces a compact state that is refractory to actin binding [2].

1: Crystal structure at 2.8 A of the DLLRKN-containing coiled-coil domain of huntingtin-interacting protein 1 (HIP1) reveals a surface suitable for clathrin light chain binding. Ybe JA, Mishra S, Helms S, Nix J; J Mol Biol. 2007;367:8-15. PMID:17257618

2: Accommodation of structural rearrangements in the huntingtin-interacting protein 1 coiled-coil domain. Wilbur JD, Hwang PK, Brodsky FM, Fletterick RJ; Acta Crystallogr D Biol Crystallogr. 2010;66:314-318. PMID:20179344