Map1 is adjacent to NAC at the UAS. (A) Ribosome fractions derived from WT (BY4741) and Δnac strains were treated with the cross-linker GMBS (200 µM) and analyzed by Western blot for Map1. (B) Ribosome fractions from WT yeast (W303) with or without the pTDH-MAP1 plasmid (pMP299), as well a Δmap1 (GFY9) strain complemented with a Map1FLAG plasmid (pMP289), were treated with GMBS as in A and analyzed by Western blot for Egd2. (C) Cross-linking of ribosome fractions from WT (RPL35, W303) and a Δrpl35A/B strain expressing a C-terminally HA-tagged RPL35A (RBY175) were performed with DSS followed by Western blot for Egd2. (D) Ribosome pellets from indicated strains were analyzed by Western blot for Egd2, Rps3, and Rpl35.