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Insight into tubulin regulation from a complex with colchicine and a stathmin-like domain.
Ravelli, Raimond B G; Gigant, Benoît; Curmi, Patrick A; Jourdain, Isabelle; Lachkar, Sylvie; Sobel, André; Knossow, Marcel.
Afiliação
  • Ravelli RB; European Molecular Biology Laboratory (EMBL), Grenoble Outstation, 6 rue Jules Horowitz, BP 181, 38042 Grenoble Cedex 9, France.
Nature ; 428(6979): 198-202, 2004 Mar 11.
Article em En | MEDLINE | ID: mdl-15014504
Microtubules are cytoskeletal polymers of tubulin involved in many cellular functions. Their dynamic instability is controlled by numerous compounds and proteins, including colchicine and stathmin family proteins. The way in which microtubule instability is regulated at the molecular level has remained elusive, mainly because of the lack of appropriate structural data. Here, we present the structure, at 3.5 A resolution, of tubulin in complex with colchicine and with the stathmin-like domain (SLD) of RB3. It shows the interaction of RB3-SLD with two tubulin heterodimers in a curved complex capped by the SLD amino-terminal domain, which prevents the incorporation of the complexed tubulin into microtubules. A comparison with the structure of tubulin in protofilaments shows changes in the subunits of tubulin as it switches from its straight conformation to a curved one. These changes correlate with the loss of lateral contacts and provide a rationale for the rapid microtubule depolymerization characteristic of dynamic instability. Moreover, the tubulin-colchicine complex sheds light on the mechanism of colchicine's activity: we show that colchicine binds at a location where it prevents curved tubulin from adopting a straight structure, which inhibits assembly.
Assuntos
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Bases de dados: MEDLINE Assunto principal: Fosfoproteínas / Tubulina (Proteína) / Colchicina / Proteínas dos Microtúbulos / Fatores de Crescimento Neural Tipo de estudo: Prognostic_studies Idioma: En Revista: Nature Ano de publicação: 2004 Tipo de documento: Article País de afiliação: França
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Bases de dados: MEDLINE Assunto principal: Fosfoproteínas / Tubulina (Proteína) / Colchicina / Proteínas dos Microtúbulos / Fatores de Crescimento Neural Tipo de estudo: Prognostic_studies Idioma: En Revista: Nature Ano de publicação: 2004 Tipo de documento: Article País de afiliação: França