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. 2012 Jun 29;7(6):e39827. doi: 10.1371/journal.pone.0039827

Figure 1. Co-immunoprecipitation analysis using proβ5- and LMP7-containing proteasome subunits over-expressed in lmp7 /Mefs.

Figure 1

Flag-tagged full-length LMP7 (LMP7-Flag), proLMP7 fused to mature β5 (proLMP7mβ5-Flag), full-length β5 (β5-Flag) and proβ5 fused to mature LMP7 (proβ5mLMP7-Flag) were over-expressed in lmp7−/−Mefs by retroviral transduction (A). The lmp7−/− Mef lines expressing the four different constructs were either left unstimulated or cultured in the presence of 50 U/ml IFNγ for 4 days. Following cell lysis, the Flag-tagged subunits were precipitated with anti-Flag-M2® agarose. Co-precipitation of the catalytic proteasome subunits β1, β2, LMP2 and MECL-1 with the proLMP7-containing subunits LMP7-Flag (B) and proLMP7mβ5-Flag (C) or the proβ5-containing subunits β5-Flag (D) and proβ5mLMP7-Flag (E), was analysed by Two-colour fluorescent immunoblot analysis. The abundance of each subunit was determined in the input material (i), the supernatant of the immunoprecipitation (SN) and the precipitate (P) for both conditions tested.