TRF1 is degraded by ubiquitin-mediated proteolysis after release from telomeres.

Abstract:

:Mammalian telomeres are coated by the sequence-specific, DNA-binding protein, TRF1, a negative regulator of telomere length. Previous results showed that ADP-ribosylation of TRF1 by tankyrase 1 released TRF1 from telomeres and promoted telomere elongation. We now show that loss of TRF1 from telomeres results in ubiquitination and degradation of TRF1 by the proteasome and that degradation is required to keep TRF1 off telomeres. Ubiquitination of TRF1 is regulated by its telomere-binding status; only the telomere-unbound form of TRF1 is ubiquitinated. Our findings suggest a novel mechanism of sequential post translational modification of TRF1 (ADP-ribosylation and ubiquitination) for regulating access of telomerase to telomeres.

journal_name

Genes Dev

journal_title

Genes & development

authors

Chang W,Dynek JN,Smith S

doi

10.1101/gad.1077103

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

1328-33

issue

11

eissn

0890-9369

issn

1549-5477

pii

17/11/1328

journal_volume

17

pub_type

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