Journal: The Journal of Biological Chemistry
Article Title: Golgi-resident TRIO regulates membrane trafficking during neurite outgrowth
doi: 10.1074/jbc.RA118.007318
Figure Lengend Snippet: TRIO directly interacts with RABIN8. A, co-immunoprecipitation of endogenous TRIO and RABIN8 in P21 mouse cerebellum. B, co-immunoprecipitation of EGFP-TRIO8 and FLAG-RABIN8 in Neuro-2a cells. C, co-immunoprecipitation of FLAG-RABIN8 with EGFP-TRIO (1–1295) and TRIO (1296–1909) in COS-7 cells. D, GST-RABIN8 pulldown assay of P21 mouse cerebellum lysates. E, RABIN8 phosphorylation assay to CGNs treated with ITX3. RAC1 activity was decreased. F, quantification of RABIN8 phosphorylation in E. The error bars indicate S.E. (Student's t test); n = 3. G, direct binding assay of His6-RABIN8 to GST–TRIO variants. Coomassie Blue staining of GST–TRIO variants are shown at the bottom. H, COS-7 cells were transfected with FLAG-RABIN8, together with either pEGFP-C3, pEGFP-TRIO(1–230), pEGFP-TRIO(208–673), pEGFP-TRIO(446–909), pEGFP-TRIO(672–1295), or pEGFP-TRIO(1296–1909), and were lysed and subjected to immunoprecipitation. RABIN8 phosphorylation level was determined. I, quantification of the pRABIN8 level in H. The error bars indicate S.E. (one-way ANOVA with Bonferroni's test). *, p < 0.05; **, p < 0.01; n = 6. n.s., not significant; A.U., arbitrary units; IP, immunoprecipitation. MW, molecular weight; WB, Western blot.
Article Snippet: Lysates were cleared by centrifugation at 12000 rpm for 10 min; some cleared supernatants were retained as the total input, and the remaining lysates were incubated with 20 μl of a 50% slurry of Anti-FLAG M2 affinity gel (A2220, Sigma–Aldrich) or 40 μl of a 50% slurry of protein A–Sephorose (catalog no. 17-0974-01, GE Healthcare) plus the rabbit anti-TRIO antibody (H120, sc-28564, Santa Cruz Biotechnology), the rabbit anti-RABIN8 antibody (12321-1-AP, Proteintech), or equal amount of the normal rabbit IgG (sc-2027, Santa Cruz Biotechnology) overnight at 4 °C.
Techniques: Immunoprecipitation, Phospho-proteomics, Activity Assay, Binding Assay, Staining, Transfection, Molecular Weight, Western Blot