Telomerase subunit overexpression suppresses telomere-specific checkpoint activation in the yeast yku80 mutant.

Abstract:

:Ku is a conserved heterodimeric DNA-binding protein that plays critical roles in DNA repair and telomere homeostasis. In Saccharomyces cerevisiae, deletion of YKU70 or YKU80 results in an inability to grow at 37 degrees C. This is suppressed by overexpression of several components of telomerase (EST1, EST2 and TLC1). We show that overexpression of EST2 or TLC1 in yku80 mutants does not restore efficient DNA repair, or restore normal telomere function, as measured by telomere length, single-stranded G-rich strand or transcriptional silencing. Instead, yku80 mutants activate a Rad53p-dependent DNA-damage checkpoint at 37 degrees C and this is suppressed by overexpression of EST2 or TLC1. Indeed, deletion of genes required for Rad53p activation also suppresses the yku80 temperature sensitivity. These results suggest that activation of the DNA-damage checkpoint in yku mutants at 37 degrees C does not result from reduced telomere length per se, but reflects an alteration of the telomere structure that is recognized as damaged DNA.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

Teo SH,Jackson SP

doi

10.1093/embo-reports/kve038

keywords:

subject

Has Abstract

pub_date

2001-03-01 00:00:00

pages

197-202

issue

3

eissn

1469-221X

issn

1469-3178

journal_volume

2

pub_type

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