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J. Biol. Chem., Vol. 277, Issue 37, 33664-33669, September 13, 2002
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From the We have previously reported that anti-tubulin
agents induce the release of cytochrome c from isolated
mitochondria. In this study, we show that tubulin is present in
mitochondria isolated from different human cancerous and non-cancerous
cell lines. The absence of polymerized microtubules and cytosolic
proteins was checked to ensure that this tubulin is an inherent
component of the mitochondria. In addition, a salt wash did not release
the tubulin from the mitochondria. By using electron microscopy, we then showed that tubulin is localized in the mitochondrial membranes. As compared with cellular tubulin, mitochondrial tubulin is enriched in
acetylated and tyrosinated
Tubulin Is an Inherent Component of Mitochondrial Membranes That
Interacts with the Voltage-dependent Anion Channel*
§,
§¶,
,
,
, and

UMR CNRS 6032, UFR Pharmacy and the
Department of Electron Microscopy, UFR Medicine, University
of La Méditerranée, 27 Boulevard Jean Moulin, 13005 Marseille, France and ** CNRS 2079, University Paul
Sabatier, 118 Route de Narbonne,
31062 Toulouse Cedex, France
-tubulin and is also enriched in the
class III
-tubulin isotype but contains very little of the class IV
-tubulin isotype. The mitochondrial tubulin is likely to be
organized in
/
dimers and represents 2.2 ± 0.5% of total cellular tubulin. Lastly, we showed by immunoprecipitation experiments that the mitochondrial tubulin is specifically associated with the
voltage-dependent anion channel, the main component of the permeability transition pore. Thus, tubulin is an inherent component of
mitochondrial membranes, and it could play a role in apoptosis via
interaction with the permeability transition pore.
*
The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.

To whom correspondence should be addressed. Tel.:
33-4-91-83-56-35; Fax: 33-4-91-78-20-24; E-mail:
diane.braguer@pharmacie.univ.mrs.fr.
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