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J. Cell Biol.,
Volume 143, Number 6, December 14, 1998 1575-1589



* Institut Curie, Section Recherche, UMR144 du Centre National de la Recherche Scientifque (CNRS), 75248 Paris Cedex 05, France; Glutamylation is the major posttranslational
modification of neuronal and axonemal tubulin and is
restricted predominantly to centrioles in nonneuronal
cells (Bobinnec, Y., M. Moudjou, J.P. Fouquet, E. Desbruyères, B. Eddé, and M. Bornens. 1998. Cell Motil.
Cytoskel. 39:223-232). To investigate a possible relationship between the exceptional stability of centriole
microtubules and the compartmentalization of
glutamylated isoforms, we loaded HeLa cells with the
monoclonal antibody GT335, which specifically reacts with polyglutamylated tubulin. The total disappearance
of the centriole pair was observed after 12 h, as judged
both by immunofluorescence labeling with specific antibodies and electron microscopic observation of cells
after complete thick serial sectioning. Strikingly, we also observed a scattering of the pericentriolar material
(PCM) within the cytoplasm and a parallel disappearance of the centrosome as a defined organelle. However, centriole disappearance was transient, as centrioles and discrete centrosomes ultimately reappeared in the cell population.
During the acentriolar period, a large proportion of
monopolar half-spindles or of bipolar spindles with abnormal distribution of PCM and NuMA were observed.
However, as judged by a quasinormal increase in cell
number, these cells likely were not blocked in mitosis.
Our results suggest that a posttranslational modification of tubulin is critical for long-term stability of centriolar microtubules. They further demonstrate that in
animal cells, centrioles are instrumental in organizing
centrosomal components into a structurally stable organelle.
Wadsworth Center, New York State Department of Health, Albany, New York 12201-0509; § UMR1772 du CNRS,
Institut Gustave Roussy, 94805 Villejuif, France; and
Collège de France, UPR9065 du CNRS, Biochimie Cellulaire, 75005 Paris,
France
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