This domain is found at the C-terminal end of Protein Hikeshi from humans and its orthologues OPI10 from other eukaryotes. Hikeshi is an specific nuclear import carrier for HSP70 proteins following heat-shock stress, which is required to protect cells from heat- shock damages. The intrinsically flexible C-terminal domain is responsible for the asymmetric dimeric conformation adopted by the protein, which seems to be an important regulator of Hsp70 binding. It shows three alpha-helices and a short beta-strand in a coiled-coil-like configuration [1].

1: Structural and functional analysis of Hikeshi, a new nuclear transport receptor of Hsp70s. Song J, Kose S, Watanabe A, Son SY, Choi S, Hong H, Yamashita E, Park IY, Imamoto N, Lee SJ; Acta Crystallogr D Biol Crystallogr. 2015;71:473-483. PMID:25760597

2: The Schizosaccharomyces pombe Hikeshi/Opi10 protein has similar biochemical functions to its human homolog but acts in different physiological contexts. Oda Y, Kimura M, Kose S, Fasken MB, Corbett AH, Imamoto N; FEBS Lett. 2014;588:1899-1905. PMID:24768994