@article{91136, keywords = {cell cycle, Models, Biological, Enzyme Activation, DNA-Binding Proteins, Saccharomyces cerevisiae Proteins, Saccharomyces cerevisiae, Genes, Fungal, Alleles, S Phase, Polymerase Chain Reaction, Telomere, G1 Phase, Precipitin Tests, RNA, Fungal, Telomerase, Telomere-Binding Proteins, DNA, Fungal}, author = {Andrew Taggart and Shu-Chun Teng and Virginia Zakian}, title = {Est1p as a cell cycle-regulated activator of telomere-bound telomerase.}, abstract = { In Saccharomyces cerevisiae, the telomerase components Est2p, TLC1 RNA, Est1p, and Est3p are thought to form a complex that acts late during chromosome replication (S phase) upon recruitment by Cdc13p, a telomeric DNA binding protein. Consistent with this model, we show that Est1p, Est2p, and Cdc13p are telomere-associated at this time. However, Est2p, but not Est1p, also binds telomeres before late S phase. The cdc13-2 allele has been proposed to be defective in recruitment, yet Est1p and Est2p telomere association persists in cdc13-2 cells. These findings suggest a model in which Est1p binds telomeres late in S phase and interacts with Cdc13p to convert inactive, telomere-bound Est2p to an active form. }, year = {2002}, journal = {Science}, volume = {297}, pages = {1023-6}, month = {08/2002}, issn = {1095-9203}, doi = {10.1126/science.1074968}, language = {eng}, }