Citoscheletro (II)
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Transcript of Citoscheletro (II)
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Citoscheletro (II)
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Organizzazione dei microtubuli
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Organizzazione dei microtubuli
Le tubuline & (55 kDa, omologhe) legano GTP/GDP. -Tubulina lega GTP (non ha attività GTPasica) -Tubulina lega GTP o GDP. Può idrolizzare GTP e scambiare GDP con
GTP.
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Organizzazione dei microtubuli
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Organizzazione dei microtubuli
Tubulina
Microtubule organizingcenter (MTOC)
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Organizzazione dei microtubuli
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L’assemblaggio della tubulina porta a fibre polarizzate
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L’assemblaggio della tubulina porta a fibre polarizzate
GTP GDP GTP GTP
protofilament ( ) (+)
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I microtubuli sono dinamicamente instabili
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Proteine che regolano la dinamica dei microtubuli
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La distanza tra i microtubuli è regolata dalle MAPs
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MAPs
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Proteine destabilizzanti i microtubuli
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Microtubule organizing centers (MTOCs)
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Microtubule organizing centers (MTOCs)
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Centrioli
Centrioles
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La γ-Tubulina termina i microtubuli
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Movimento lungo i microtubuli
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Evoluzione delle proteine motrici
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Movimento lungo i microtubuli: Kinesin
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Movimento lungo i microtubuli: Dynein
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Movimento lungo i microtubuli: Dynein
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Kinesin & Dynein nella movimentazione intracellulare
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Scambio del carico tra kinesine e miosine
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L’apparato mitotico: un sistema specializzato di microtubuli
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L’apparato mitotico: un sistema specializzato di microtubuli
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La duplicazione cellulare è iniziata dalla duplicazione dei centrosomi
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Le proteine dei cinetocori guidano l’interazione dei cromosomi con i microtubuli