Human papillomavirus type 16 E6 inhibits p21(WAF1) transcription independently of p53 by inactivating p150(Sal2).

Abstract:

:HPV16 E6 deregulates G1/S cell cycle progression through p53 degradation preventing transcription of the CDK inhibitor p21(WAF1). However, additional mechanisms independent of p53 inactivation appear to exist. Here, we report that HPV16 E6 targets the cellular factor p150(Sal2), which positively regulates p21(WAF1) transcription. HPV16 E6 associates with p150(Sal2), inducing its functional inhibition by preventing its binding to cis elements on the p21(WAF1) promoter. A HPV16 E6 mutant, L110Q, which was unable to bind p150(Sal2), did not affect the ability of the cellular protein to bind p21(WAF1) promoter, underlining the linkage between these events. These data describe a novel mechanism by which HPV16 E6 induces cell cycle deregulation with a p53-independent pathway. The viral oncoprotein targets p150(Sal2), a positive transcription regulator of p21(WAF1) gene, preventing G1/S arrest and allowing cellular proliferation and efficient viral DNA replication.

journal_name

Virology

journal_title

Virology

authors

Parroche P,Touka M,Mansour M,Bouvard V,Thépot A,Accardi R,Carreira C,Roblot GG,Sylla BS,Hasan U,Tommasino M

doi

10.1016/j.virol.2011.05.016

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

443-8

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(11)00251-0

journal_volume

417

pub_type

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