Residues in the alternative reading frame tumor suppressor that influence its stability and p53-independent activities.

Abstract:

:The Alternative Reading Frame (ARF) protein suppresses tumorigenesis through p53-dependent and p53-independent pathways. Most of ARF's anti-proliferative activity is conferred by sequences in its first exon. Previous work showed specific amino acid changes occurred in that region during primate evolution, so we programmed those changes into human p14ARF to assay their functional impact. Two human p14ARF residues (Ala(14) and Thr(31)) were found to destabilize the protein while two others (Val(24) and Ala(41)) promoted more efficient p53 stabilization and activation. Despite those effects, all modified p14ARF forms displayed robust p53-dependent anti-proliferative activity demonstrating there are no significant biological differences in p53-mediated growth suppression associated with simian versus human p14ARF residues. In contrast, p53-independent p14ARF function was considerably altered by several residue changes. Val(24) was required for p53-independent growth suppression whereas multiple residues (Val(24), Thr(31), Ala(41) and His(60)) enabled p14ARF to block or reverse the inherent chromosomal instability of p53-null MEFs. Together, these data pinpoint specific residues outside of established p14ARF functional domains that influence its expression and signaling activities. Most intriguingly, this work reveals a novel and direct role for p14ARF in the p53-independent maintenance of genomic stability.

journal_name

Exp Cell Res

authors

di Tommaso A,Hagen J,Tompkins V,Muniz V,Dudakovic A,Kitzis A,Ladeveze V,Quelle DE

doi

10.1016/j.yexcr.2009.01.010

subject

Has Abstract

pub_date

2009-04-15 00:00:00

pages

1326-35

issue

7

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(09)00037-8

journal_volume

315

pub_type

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