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. 2024 Jul 1;25(8):3348–3372. doi: 10.1038/s44319-024-00183-w

Figure EV4. Structural and biochemical characterisation of Mis18α C-terminal helix.

Figure EV4

(A) Cartoon representation of the crystal structure of Mis18αC-term/Mis18βC-term (PDB ID: 7SFY). Mis18α is shown in purple and Mis18β in light pink. Potential residues involved in the interaction are highlighted. Mis18α (purple) and Mis18β (light pink). Right panel shows SDS-PAGE analysis of cobalt and amylose pull-down of His-MBP-Mis18β188–229 WT with His-SUMO-Mis18α191–233 mutants. SDS-PAGE shows protein bound to nickel resin as input (I) and protein-bound to amylose resin to assess interaction (P). Control with WT proteins shown in Fig. 4A. (B) Western blot analysis of co-immunoprecipitation (Co-IP) experiments using Mis18α antibody to test interaction of mCherry as a control, Mis18α−mCherry with and without mutations in the C-terminal α-helices and Mis18β-GFP. Top panel shows blot against mCherry, middle panel shows blot against GFP, and bottom panel shows blot against tubulin as loading control. (C) SEC-MALS of His-SUMO-Mis18α188-233 WT, His-SUMO-Mis18α188-233 I201A/L205A and His-SUMO-Mis18α188-233 L212A/L215A/L219A. Normalised absorption at 280 nm (mAU, left y-axis) and molecular mass (kDa, right y-axis) are plotted against elution volume (ml, x-axis). Measured molecular weight (MW) and the calculated subunit stoichiometry based on the predicted MW. Samples were analysed using a Superdex 75 increase in 50 mM HEPES pH 8.0, 150 mM NaCl and 1 mM TCEP. (D) Representative immunoblots showing expression levels of endogenous proteins after treatment with siRNA. (E) Representative immunoblots showing expression levels of transiently expressed tagged proteins after transfection.