Lecture 6 Flashcards

1
Q

Hvorfor troede folk at p53 var et onkogen?

A

Fordi det er en dominant negativ mutation.

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2
Q

Hvad er de vigtigste regulatoriske aspekter af p53 regulering?

A

1) det er meget hurtigt omsat - kort levetid
2) Interaktion med Mdm2
3) Phosphorylering - af bl.a. atm som forhindrer binding af Mdm2
4) Acetylering - forbedrer DNA-bindende aktivitet.

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3
Q

p53 stabilisering:

A

1) Phosphorylering og dissociering fra Mdm2 (ATM)

2) ARF overekspresseres af onkogener - kompetitiv bindning til Mdm2

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4
Q

P53 targets:

A

1) p21 (CKI) transskription
2) Mdm2
3) DNA damage repair genes
4) Apoptotiske gener
5) anti-angiogenese gener

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5
Q

Hvilken anden pathway er nødvendig for at stoppe onkogener?

A

p21 - altså cdk-inhibitorer. Stopper Rb i at bliver phosphoryleret.

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