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Telomerase, which synthesizes telomeric DNA in eukaryotic cells, is classified as a reverse transcriptase. To clarify the recognition of 2'-deoxyribonucleoside 5'-triphosphate (dNTP) chirality by telomerase, we studied the inhibitory effects of L-dGTP on HeLa cell telomerase activity using a quantitative 'stretch PCR' assay. L-dGTP had a weakly inhibitory effect (IC50 = 200 microM) in the presence of 10 microM dGTP. This effect was less obvious when the concentration of dGTP was higher. L-dTTP had a similar inhibitory effect. These findings suggest that telomerase may bind to L-dGTP and L-dTTP, and that the ability of telomerase to bind to dGTP or dTTP is changed.

Inhibitory effects of L-2'-deoxyguanosine 5'-triphosphate (L-dGTP) and L-2'-deoxythymidine 5'-triphosphate (L-dTTP) on human telomerase