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Inhibition of plant telomerase by telomere-binding proteins from nuclei of telomerase-negatative tissues

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FULNEČKOVÁ Jana FAJKUS Jiří

Rok publikování 2000
Druh Článek v odborném periodiku
Časopis / Zdroj FEBS letters : for the rapid publication of short reports in biochemistry, biophysics and molecular biology
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Obor Genetika a molekulární biologie
Klíčová slova Plant telomerase regulation; Telomere binding protein; Telomerase inhibition
Popis The activity of telomerase in plant cells is precisely regulated in response to changes in cell division rate. To explore this regulatory mechanism, the effect on telomerase activity of protein extracts from nuclei of telomerase-negative tissues was examined. An inhibition of telomerase activity was found which was species-non-specific. This inhibition was due to proteins which form salt-stable, sequence- specific complexes with the G-rich telomeric strand and reduce its accessibility, as shown by gel retardation and by terminal transferase (TdT) extension of G-rich telomeric and non-telomeric (substrate) primers. A 40 kDa polypeptide was detected by SDS-PAGE after cross- linking the complex formed by extracts from tobacco leaf nuclei. Such proteins may be involved in regulation of telomerase activity in plants.
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