Tema 5 Genética Flashcards

(21 cards)

1
Q

Eucariotas

A

3 ARN polimerasas

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2
Q

RNA 7SL

A

Esencial para el transporte al RE

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2
Q

RNA pol I

A

Sintetiza para rRNAs (18,5,8,28), en el nucleolo, muy resistente a amanitina

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3
Q

RNA pol II

A

mRNAS, snoRNAS, snRNA, miRNA, en el nucleoplasma y muy sensible. Destaca por el CTD

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4
Q

RNA pol III

A

tRNAs, 5S, RNA 7SL

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5
Q

Promotor basal

A
  • INR (secuencias iniciadoras)
  • TATA box
  • DPE (downstream) reconocido por TFIID
  • BRE: reconocido por TFIIB
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6
Q

TFIIA

A

Estabiliza el complejo

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6
Q

TFIIB

A

Selección de punto de inicio

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6
Q

TFIID

A

Formado por TBP y 10TAFs. Se une a la caja TATA por el surco menor. Distorsiona la caja TATA y permite la unión de otros factores

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6
Q

TFIIF

A

Recluta a la polimerasa uniéndose a RNA pol II y a TFIIB

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6
Q

TFIIE

A

Estabiliza la RNA pol II

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7
Q

TFIIH

A

Actividad helicasa + CDK7

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8
Q

Iniciación

A

Fosforilación en Ser 5 y Ser 7 por la CDK7 (TFIIJ)

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9
Q

Elongación

A

Ser 2 fosforilada por la CDK9 (P-TEFb)

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10
Q

SL1

A

De la RNA poli I. Formada por la TBP y 4 TAFs, que se unen a la Pol I en presencia de UBF

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11
Q

UBF

A

secuencias ricas en GC en la región UCE, abre la cromatina e impide la unión de H1

12
Q

Polimerasa III

A

Se localiza en el nucleosoma y transcribe para tRNA, rRNA 5s y RNA 7sL

13
Q

Clase I

A

5SRNA: promotor interno, down

14
Q

Clase II

A

tRNAs: promotor interno, down

15
Q

Clase III

A

snRNAs: promotor externo, up

16
Q

TFIIIB