Effects of dynein subunit suppression on dynein integrity. (A–H) Immunoblots show the expression of (A) GAPDH, (B) p50dynamitin, (C) DHC1, (D) IC2, (E) LIC1, (F) LIC2, (G) LC8, and (H) Tctex in lysates from HeLa cells transfected with siRNA duplexes directed against target proteins as indicated. (I–L) Fractions from 5 to 40% sucrose density gradients from cells depleted of (I) lamin A/C, (J) DHC1, (K) LIC1, or (L) LIC2 were immunoblotted for GAPDH, p50dynamitin, DHC1, IC2, LIC1, or LIC2 as indicated. Fraction 4 corresponds to 19S as judged by thyroglobulin sedimentation.