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Fig. 3. The tripartite attachment complex. (A) An electron micrograph of the region of the flagellar pocket (labelled F.P). The basal body (BB) is shown connected to the kinetoplast through a series of unilateral filaments, which link the kinetoplast to the inner mitochondrial membrane (these are indicated by the small brackets). The exclusion zone filaments (indicated by a large bracket) link the mitochondrial outer membrane and the basal body. The inset shows a schematic representation of the region of the trypanosome cell shown in the electron micrograph. (B) A representation of the flagellar/basal bodies/kinetoplast region and its replication during the trypanosome cell cycle. The left-hand image is the organization of the tripartite attachment complex in G1 phase; the middle image represents S phase, when kinetoplast replication is underway, and when the probasal body has matured and two new probasal bodies have formed. The right-hand image shows segregation of the basal bodies and concomitant kinetoplast DNA segregation. Figure adapted with kind permission from K. Gull (University of Oxford, UK) and The American Society for Cell Biology (Ogbadoyi et al., 2003).





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