This domain is found in Spindle assembly abnormal protein 6 from Caenorhabditis elegans (Sas-6), which is essential for centriole formation. This domain is C-terminal to Pfam:PF16531. It shows an alpha-helical conformation [1].

1: Caenorhabditis elegans centriolar protein SAS-6 forms a spiral that is consistent with imparting a ninefold symmetry. Hilbert M, Erat MC, Hachet V, Guichard P, Blank ID, Fluckiger I, Slater L, Lowe ED, Hatzopoulos GN, Steinmetz MO, Gonczy P, Vakonakis I; Proc Natl Acad Sci U S A. 2013;110:11373-11378. PMID:23798409