Journal: bioRxiv
Article Title: RAPSYN-Mediated Neddylation of BCR-ABL Alternatively Determines the Fate of Philadelphia Chromosome-positive Leukemia
doi: 10.1101/2023.05.24.542110
Figure Lengend Snippet: (A) Co-immunoprecipitation of BCR-ABL and RAPSYN in leukemic cells. (B) Immunoblot of GST and His after immunoprecipitation of His or GST in HEK293T cells transfected with His-tagged BCR-ABL and GST-tagged RAPSYN. (C) Immunoblot of GST and His following GST pull-down after in vitro incubation of purified His-tagged BCR-ABL and GST or GST-tagged RAPSYN. (D) His-immunoblot of GST immunoprecipitates from HEK293T cells transfected with GST-tagged RAPSYN alone or in combination with His-tagged full-length or truncated BCR-ABL (Δ1: aa 1-927, Δ2: aa 928-2047). (E) Analysis of BCR-ABL neddylation levels in leukemic cells. (F) Analysis of BCR-ABL neddylation levels in leukemic cells treated with MLN4924 or DMSO for 24 h. (G) HA-immunoblot of His-immunoprecipitate from HEK293T cells transfected with His-tagged BCR-ABL and HA-tagged NEDD8 or NEDD8 ΔGG. (H) HA-immunoblot of the His-immunoprecipitate from HEK293T cells transfected with the indicated constructs. (I) Analysis of BCR-ABL neddylation levels in K562 WT, RAPSYN KO and RAPSYN KO with exogenous expression of a RAPSN cDNA cells. (J) HA-immunoblot after immunoprecipitation of His in HEK293T cells transfected with His-tagged BCR-ABL, HA-tagged NEDD8, GFP-tagged WT RAPSYN or C366A RAPSYN. (K) Assessment of BCR-ABL neddylation by RAPSYN in vitro. Purified RAPSYN and BCR-ABL were incubated with APPBP1/UBA3, UBE2M or NEDD8 in in vitro neddylation assay. (L) Analysis of BCR-ABL neddylation levels in excised tumor xenografts from . (M) Verification of BCR-ABL neddylation sites in HEK293T cells transfected with indicated constructs.
Article Snippet: A 30 μL reaction mixture containing 2 mM ATP-Mg2+ (B-20, R&D), 50 ng E1(APPBP1/UBA3; E-313-25, R&D), 400 ng E2 (UBE2M; E2-656-100, R&D), 0.25 μg NEDD8 (UL-812-500, R&D), 0.35 μg His-BCR-ABL, with or without 4.77 μg RAPSYN was incubated at 37°C for 4 h. Reaction was terminated with SDS-PAGE loading buffer and assayed using immunoblotting.
Techniques: Immunoprecipitation, Western Blot, Transfection, In Vitro, Incubation, Purification, Construct, Expressing