Figure 3.
The middle region of Asp has MT cross-linking activity. (A) Rescue experiments using UTR RNAi and ectopic expression of GFP fusion proteins (n = 23–32). (B) Expression of Asp [574–972 aa]-GFP resulted in overbundling of spindle MTs and unfocused the poles. (C) Purified Asp [574–972 aa]-GFP demonstrated MT cross-linking activity in vitro. Taxol-stabilized, rhodamine-labeled MTs were mixed with (top) or without (bottom) Asp [574–972 aa]-GFP. We could not eliminate a smaller size band, possibly a degraded product of Asp [574–972 aa]-GFP. Bars: (A and B) 5 µm; (C) 10 µm.