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- Title
Cell cycle-dependent regulation of yeast telomerase by Ku.
- Authors
Fisher, Timothy S; Taggart, Andrew K P; Zakian, Virginia A
- Abstract
The heterodimeric Ku complex affects telomere structure in diverse organisms. We report here that in the absence of Ku, the catalytic subunit of telomerase, Est2p, was not telomere-associated in G1 phase, and its association in late S phase was decreased. The telomere association of Est1p, a telomerase component that binds telomeres only in late S phase, was also reduced in the absence of Ku. The effects of Ku on telomerase binding require a 48-nucleotide (nt) stem-loop region of TLC1 telomerase RNA. Ku interacts with TLC1 RNA via this 48-nt region throughout the cell cycle, but this interaction was reduced after telomere replication. These data support a model in which Ku recruits telomerase to telomeres in G1 phase when telomerase is inactive and promotes telomerase-mediated telomere lengthening in late S phase.
- Publication
Nature structural & molecular biology, 2004, Vol 11, Issue 12, p1198
- ISSN
1545-9993
- Publication type
Journal Article
- DOI
10.1038/nsmb854