Figure EV5. The condensation of P-bodies induced by energy stress depends on ubiquitinated HAX1.
(A) Immunoblot of HEK293T cells transfected with shCtrl or two independent HAX1 shRNAs. (B, C) Control and HAX1 knockdown (shHAX1) HEK293T cells were stained for LSM14A and DAPI. Representative images are shown in (B). The number of P-bodies within each cell is plotted in (C) (n = 50). Scale bar, 5 μm. Error bars indicate SEM. ****P < 0.0001 (Student’s t test). (D) The expression of HAX1, 4E-T, DCP1A, DDX6, and LSM14A in HAX1 KO HEK293T cells was detected by immunoblotting. (E, F) Control and HAX1 KO HEK293T cells were exposed to sodium arsenite (2 h) and immunolabeled for TIA1 and G3BP2 (E). Scale bar, 5 μm. The number of stress granules within each cell is plotted in (F) (n = 50). Statistical Error bars indicate SEM. Ns: no significance (two-way ANOVA). (G) S2 and P2 fractions from HEK293T cells treated with oligomycin for the indicated times were analyzed by immunoblotting. (H) S2 and P2 fractions from HAX1 KO HEK293T cells transfected with HAX1WT or HAX1K131R along with sgCrtl or sgTRIM23 were analyzed by immunoblotting. (I, J) S2 and P2 fractions from control and HAX1-knockdown (shHAX1) HEK293T cells with or without oligomycin treatment (1 h) (I) or TRIM23 overexpression (J) were analyzed by immunoblotting.