Aromatic residues in sorLA are important for the association with retromer proteins. A, Amino acid sequences of human WT and mutant sorLA cytoplasmic tails. Overlapping 15-mer peptides used for pull-down studies are indicated. B, Precipitated proteins are visualized by SDS-PAGE and Coomassie staining. The arrowhead marks the VPS26 subunit identified by MS in several independent experiments. C, Co-IP analysis of CD8 chimeric proteins from transfected HeLa cells. Precipitated proteins were analyzed by WB. The asterisk in lane CD8ED–APPCD–WT indicates an unknown protein unrelated to VPS26. D, Co-IP of VPS35 with sorLA–WT from stably transfected SH-SY5Y cells. E, F, Surface plasmon resonance analysis using 50 nm VPS26 protein or 500 nm GGA1–VHS domain applied to biosensor surfaces immobilized with sorLA–WT and sorLA–FANSHY→6A tails fused to H6Ubi.