Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 280, Issue 38, Pages 32801-32810Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M506319200
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Funding
- NCI NIH HHS [K01-CACA87542] Funding Source: Medline
- NIAID NIH HHS [R01-AI30861] Funding Source: Medline
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Human telomerase is a specialized reverse transcriptase that utilizes an integral RNA subunit to template the synthesis of telomeres. In the present study, we demonstrate that the human telomerase template sequence not only determines the composition, but also the rate of synthesis, of telomere repeats. Mutagenesis of the template sequence identified variants that reconstitute enzymes with repeat extension rates that were either faster or slower than wild type template. Changes in extension rate could not be attributed solely to altered heteroduplex melting, strongly suggesting that specific interactions between telomerase template, protein, and products contribute significantly in determining repeat extension rate. Furthermore, some substitutions that had no effect on extension rate led to striking increases in repeat processivity, indicating that processivity and extension rates can be regulated independently of each other. Our results suggest that telomerase RNA template sequence is a key determinant of the contribution of telomerase to telomere length regulation.
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