This region is the N-terminal extended region found in the Ski2 protein. The Ski complex is a conserved multiprotein assembly required for the cytoplasmic functions of the exosome, including RNA turnover, surveillance, and interference [1]. Ski2, Ski3, and Ski8 assemble in a tetramer with 1:1:2 stoichiometry.

1: The yeast ski complex: crystal structure and RNA channeling to the exosome complex. Halbach F, Reichelt P, Rode M, Conti E; Cell. 2013;154:814-826. PMID:23953113