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Journal: bioRxiv
Article Title: Phosphorylation Protects Oncogenic RAS from LZTR1-Mediated Degradation
doi: 10.64898/2026.01.07.698128
Figure Lengend Snippet: A ) CRISPR screening strategy to identify regulators of KRAS protein stability. B ) Volcano plot of average KRAS stability scores (n=3). Significant hits for genes that either decrease (pink) or increase (purple) KRAS expression are indicated. Callouts represent genes identified as RAS interaction partners by mass spectrometry . C ) Venn diagram of overlapping genes from KRAS stability screen (≤-0.8 KRAS stability score and P≤0.05), RAS BioID2 proteomics (≥1.0 log2 enrichment vs. control, from ref: ), and genes essential in RAS-dependent MM cell lines (≤-1.0 CSS, from ref: ). D ) Western blot analysis of RAS, PPP1R2, and GAPDH 3 days after transduction with control shRNA (shCTRL) or PPP1R2-targeting shRNAs in XG7, RPMI 8226, and MM.1S MM lines, n=3. E ) PPP1R2-BioID2 enrichment over empty vector in RPMI 8226 cells. F ) Western blot analysis of RAS, PPP1R2, PP1C, and GAPDH 3 days after transduction with shCTRL, shPPP1R2.1, and/or ectopic expression of DN PP1C, n=3. G ) Comparison of protein expression levels between KRAS (x-axis) and average PP1C (PPP1CA, PPP1CB, PPP1CC, and PPP1CC;PPP1CB) in 115 MM patient tumors. Display line is simple linear regression; R 2 =0.1593, P<0.0001. I ) Model of PPP1R2 and PP1C regulation of KRAS protein expression. Under a normal state, PPP1R2 inhibits PP1C activity. Following PPP1R2 disruption, PP1C activity reduces KRAS levels. In contrast, PP1C disruption increases KRAS expression.
Article Snippet: Briefly, 150 ng of
Techniques: CRISPR, Expressing, Mass Spectrometry, Control, Western Blot, Transduction, shRNA, Plasmid Preparation, Comparison, Activity Assay, Disruption