title: Two related subpellicular cytoskeleton-associated proteins in Trypanosoma brucei stabilize microtubules.
abstract: The subpellicular microtubules of the trypanosome cytoskeleton are cross-linked to each other and the plasma membrane, creating a cage-like structure. We have isolated, from Trypanosoma brucei, two related low-molecular-weight cytoskeleton-associated proteins (15- and 17-kDa), called CAP15 and CAP17, which are differentially expressed during the life cycle. Immunolabeling shows a corset-like colocalization of both CAPs and tubulin. Western blot and electron microscope analyses show CAP15 and CAP17 labeling on detergent-extracted cytoskeletons. However, the localization of both proteins is restricted to the anterior, microtubule minus, and less dynamic half of the corset. CAP15 and CAP17 share properties of microtubule-associated proteins when expressed in heterologous cells (Chinese hamster ovary and HeLa), colocalization with their microtubules, induction of microtubule bundle formation, cold resistance, and insensitivity to nocodazole. When overexpressed in T. brucei, both CAP15 and CAP17 cover the whole subpellicular corset and induce morphological disorders, cell cycle-based abnormalities, and subsequent asymmetric cytokinesis.
authors.affiliation: Laboratoire de Parasitologie Moléculaire, Université Victor Segalen de Bordeaux II, Unité Mixte Recherche-5016 Centre National de la Recherche Scientifique, 33076 Bordeaux, France.
authors.forename: Cécile
authors.initials: C
authors.lastname: Vedrenne
authors.forename: Christiane
authors.initials: C
authors.lastname: Giroud
authors.forename: Derrick R
authors.initials: DR
authors.lastname: Robinson
authors.forename: Sébastien
authors.initials: S
authors.lastname: Besteiro
authors.forename: Christophe
authors.initials: C
authors.lastname: Bosc
authors.forename: Frédéric
authors.initials: F
authors.lastname: Bringaud
authors.forename: Théo
authors.initials: T
authors.lastname: Baltz
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000962:Antimalarials / Q000378:metabolism; D016466:CHO Cells; D006224:Cricetinae; D003599:Cytoskeleton / Q000378:metabolism*; D004318:Doxycycline / Q000378:metabolism; D005407:Flagella / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D008854:Microscopy, Electron; D008869:Microtubule-Associated Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D008870:Microtubules / Q000378:metabolism*; D008969:Molecular Sequence Data; D015800:Protozoan Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D014346:Trypanosoma brucei brucei / Q000166:cytology* / Q000378:metabolism
chemical_list: D000962:Antimalarials; D008869:Microtubule-Associated Proteins; D015800:Protozoan Proteins; D011994:Recombinant Proteins; D004318:Doxycycline