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Telomerase is a ribonucleoprotein enzyme responsible for the addition of telomeres onto the ends of chromosomes. Short or dysfunctional telomeres can lead to cell growth arrest, apoptosis, and genomic instability. Telomerase uses its RNA subunit to copy a short template region for telomere synthesis. To probe for regions of Tetrahymena telomerase RNA essential for function, we assayed 27 circularly permuted RNA deletions for telomerase in vitro activity and binding to the telomerase reverse transcriptase catalytic protein subunit. We found that stem-loop IV is required for wild-type telomerase activity in vitro and will stimulate processivity when added in trans.

Stem-Loop IV of Tetrahymena Telomerase RNA Stimulates Processivity in trans