Publication

Telomerase repeat addition processivity is increased at critically short telomeres in a Tel1-dependent manner in Saccharomyces cerevisiae

Chang, M., Arneric, M. & Lingner, J., 1-Oct-2007, In : Genes & Development. 21, 19, p. 2485-2494 10 p.

Research output: Contribution to journalArticleAcademicpeer-review

Telomerase is the ribonucleoprotein enzyme that elongates telomeres to counteract telomere shortening. The core enzyme consists of a reverse transcriptase protein subunit and an RNA subunit. The RNA subunit contains a short region that is used as a template by the reverse transcriptase to add short, tandem, G-rich repeats to the 3' ends of telomeres. By coexpressing two RNA subunits that differ in the telomeric repeat sequence specified and examining the telomere extensions after one cell cycle, we determined that Saccharomyces cerevisiae telomerase can dissociate and reassociate from a given telomere during one cell cycle. We also confirmed that telomerase is nonprocessive in terms of telomeric repeat addition. However, repeat addition processivity is significantly increased at extremely short telomeres, a process that is dependent on the ATM-ortholog Tel1. We propose that this enhancement of telomerase processivity at short telomeres serves to rapidly elongate critically short telomeres.

Original languageEnglish
Pages (from-to)2485-2494
Number of pages10
JournalGenes & Development
Volume21
Issue number19
Publication statusPublished - 1-Oct-2007
Externally publishedYes

    Keywords

  • telomerase, processivity, Saccharomyces cerevisiae, TLC1, Tel1, DNA-BINDING PROTEIN, YEAST TELOMERASE, TERMINAL TRANSFERASE, IN-VIVO, LENGTH HOMEOSTASIS, CATALYTIC SUBUNIT, IDENTIFICATION, REPLICATION, CDC13, RNA

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