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. 2009 Sep 7;186(5):685–692. doi: 10.1083/jcb.200906110

Figure 4.

Figure 4.

TRC8 forms a multimolecular ER complex with MHC I, US2, and SPP. (A) Doxycycline-induced, HA–ΔRING TRC8 HEK-293 cells transfected with US2 were radiolabeled for 30 min, and lysates were immunoprecipitated with HA or normal rabbit serum (NRS) control. (B) Doxycycline-induced HA–ΔRING TRC8 HEK-293 cells transfected with US2 and SPP were radiolabeled and immunoprecipitated with HA as in A, and samples were denatured and reprecipitated with normal rabbit serum, US2, SPP, or MHC I heavy chain (HCA2). (C) US2-expressing HeLa cells transfected with HA–ΔRING TRC8 were radiolabeled, and immunoprecipitations were performed as in B, or the cells were reprecipitated with MHC I heavy chain (HC10). (D) HA–ΔRING TRC8–overexpressing HEK-293 cells were radiolabeled, and immunoprecipitations were performed as in B. (A–D) Molecular mass is indicated in kilodaltons. 1°, primary; 2°, secondary; IP, immunoprecipitation.