gli operoni. l’operone lac regolatori in cis e trans trans cis
TRANSCRIPT
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Gli Operoni
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L’Operone lac
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Regolatori in cis e trans
Trans
Cis
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I Repressori Legano il DNA
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L’Operatore
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I Repressori Possono Cambiare Forma
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Azione dei Repressori
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Regolazione Positiva e Negativa
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Il cAMP
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Il CAP
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La Doppia Regolazione dell’Operone lac
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La Sintesi dell’RNA
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La struttura dei geni nei procarioti e negli eucarioti
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L’inizio della trascrizione negli
eucarioti
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Le regioni regolatorie nei geni eucarioti
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Come viene legato il DNA
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Il motivo Helix-Turn-Helix
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Alcuni fattori legano il DNA come dimeri
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Dimeri e Helix-Turn-Helix
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La cerniera di leucine
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Il motivo Helix-Loop-Helix
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Il motivo Zinc-Finger
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Regolazione a Distanzagli Enhancers
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I domini attivatori
sonoseparati
dai domini
leganti il DNA
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I domini attivatori possono interagire con TFIID
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I repressori
negli eucarioti
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Enhanceosoma
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Assemblaggio cooperativo del complesso d’inizio
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La natura dei complessi di fattori trascrizionali inluenza la trascrizione