This family is found at the C-terminus of the coatamer beta subunit proteins (Beta-coat proteins). This C-terminal domain probably adapts the function of the N-terminal Pfam:PF01602 domain.

1: Characterization of a fourth adaptor-related protein complex. Hirst J, Bright NA, Rous B, Robinson MS; Mol Biol Cell. 1999;10:2787-2802. PMID:10436028

2: Similar subunit interactions contribute to assembly of clathrin adaptor complexes and COPI complex: analysis using yeast three-hybrid system. Takatsu H, Futatsumori M, Yoshino K, Yoshida Y, Shin HW, Nakayama K; Biochem Biophys Res Commun. 2001;284:1083-1089. PMID:11409905