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Using specific monoclonal antibodies, we investigated the distribution of post-translational modified Tyr-and Glu-tubulins during interphase of the primitive flagellate Entosiphon sul­catum. Immunofluorescence studies of simultaneously permeabilized and fixed cells revealed that microtubular structures comprising Ca 2⊕ -labile subpellicular and flagellar MTs and Ca 2⊕ -stable MTs in the siphon complex (feeding organelle) reacted surprisingly unorthodox with antibodies against Tyr-and Glu-tubulin: Unexpectedly, the siphon complex consisting of Ca 2⊕ -stable MTs appeared exclusively Tyr-positive, whereas the Ca 2⊕ -labile subpellicular and flagellar MTs reacted with the Glu- as well as with the Tyr-antibody. That the siphon MTs were indeed Ca 2⊕ -stable and all other MTs had become solubilized, was verified by EM-observation.

The Glu-Modification of α-Tubulin in the Feeding Apparatus of the Primitive Flagellate Entosiphon sulcatum Is Only Apparent after Detergent Treatment