Abstract：
:In trypanosomes, the flagellum is rooted in the flagellar pocket, a surface micro-domain that is the sole site for endocytosis and exocytosis. By analysis of anterograde or retrograde intraflagellar transport in IFT88RNAi or IFT140RNAi mutant cells, we show that elongation of the new flagellum is not required for flagellar pocket formation but is essential for its organisation, orientation and function. Transmission electron microscopy revealed that the flagellar pocket exhibited a modified shape (smaller, distorted and/or deeper) in cells with abnormally short or no flagella. Scanning electron microscopy analysis of intact and detergent-extracted cells demonstrated that the orientation of the flagellar pocket collar was more variable in trypanosomes with short flagella. The structural protein BILBO1 was present but its localisation and abundance was altered. The membrane flagellar pocket protein CRAM leaked out of the pocket and reached the short flagella. CRAM also accumulated in intracellular compartments, indicating defects in routing of resident flagellar pocket proteins. Perturbations of vesicular trafficking were obvious; vesicles were observed in the lumen of the flagellar pocket or in the short flagella, and fluid-phase endocytosis was drastically diminished in non-flagellated cells. We propose a model to explain the role of flagellum elongation in correct flagellar pocket organisation and function.
journal_name
J Cell Scijournal_title
Journal of cell scienceauthors
Absalon S,Blisnick T,Bonhivers M,Kohl L,Cayet N,Toutirais G,Buisson J,Robinson D,Bastin Pdoi
10.1242/jcs.035626subject
Has Abstractpub_date
2008-11-15 00:00:00pages
3704-16issue
Pt 22eissn
0021-9533issn
1477-9137pii
jcs.035626journal_volume
121pub_type
杂志文章abstract：:In a previous study we demonstrated that a homeobox peptide corresponding to the 60 amino acid long DNA-binding region of the Drosophila antennapedia homeo-protein was capable of crossing the plasma membrane of cells in culture. This finding has led us to investigate whether chimeric molecules encompassing the homeobo...
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