NEEP21, GRIP1, GluR2 and syntaxin 13 are present in 600–900 kDa complexes. NEEP21, GRIP1, GluR2 and syntaxin 13 are present in 600–900 kDa complexes. (A)

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NEEP21, GRIP1, GluR2 and syntaxin 13 are present in 600–900 kDa complexes. NEEP21, GRIP1, GluR2 and syntaxin 13 are present in 600–900 kDa complexes. (A) Antibodies crosslinked to beads (N21, anti‐NEEP21; s13, anti‐syntaxin 13; rIgG, rabbit IgG; mIgG, mouse IgG) were incubated with rat brain membrane extract (1.6 mg) and immunoprecipitated proteins (IP) analyzed by Western blotting for the indicated proteins (syx13, syntaxin 13; extr, crude input extracts corresponding to 1/20 of immune pellets). The arrowhead indicates crossreacting antibody heavy chain. (B) As in panel A. Anti‐NEEP21 antibodies co‐precipitate GluR2, but not SAP97, PSD95, synaptophysin (syp), syntaxin 1 (syx1), VAMP2 or αSNAP. SAP97 appears at 140 kDa (arrow) and an additional, presumably degradation product at about 90 kDa in extract lane, as described previously (Muller et al, 1995). (C) Rat brain membrane extract (6 mg) was separated on a Superdex 200 size‐exclusion chromatography column and fractions were analyzed by Western blotting for the indicated proteins. The column was calibrated in parallel runs using the following as standards: Blue Dextran, void volume; thyroglobulin, 669 kDa; ferritin, 440 kDa; catalase, 232 kDa; albumin, 67 kDa; chymotrypsin, 25 kDa. NEEP21 elutes in two distinct peaks around 800 and 250 kDa. (D) Fractions 3–6 or 11–14, containing NEEP21 around 800 or 250 kDa, respectively, were pooled from five column runs and loaded sequentially on a nonspecific rabbit IgG (rIgG) column and then on a specific anti‐NEEP21 immunoaffinity column. Eluted proteins were analyzed. Note that GluR2, GRIP1 and syntaxin 13 co‐precipitate with NEEP21 from 800 kDa fractions, but not from 250 kDa fractions. (E) As in panel D, but using non‐crosslinked mouse IgG and then mouse anti‐GluR2 for immunoprecipitation. Co‐precipitation of NEEP21 was detected only in 800 kDa fractions. Pascal Steiner et al. EMBO J. 2005;24:2873-2884 © as stated in the article, figure or figure legend