Abstract
Telomerase, consisting of telomerase RNA and telomerase reverse transcriptase (TERT), is responsible for the maintenance of the end of linear chromosomes. TERT, as the catalytic subunit of telomerase, plays a critical role in telomerase activity. Researches indicate TERT-associated proteins participate in the regulation of telomerase assembly, posttranslational modification, localization, and enzymatic function. Here, the telomerase RNA-binding domain of Eimeria tenella TERT (EtTRBD) was cloned into pGBKT7 and performed as the bait. α-Galactosidase assay showed that the bait plasmid did not activate Gal4 reporter gene. Further, we isolated an EtTRBD-associated protein, 14-3-3, by yeast two-hybrid screening using the constructed bait plasmid. To confirm the interaction, EtTRBD and 14-3-3 were expressed by prokaryotic and eukaryotic expression systems. Pull-down assays by purified proteins demonstrated a direct bind between EtTRBD and 14-3-3. Co-immunoprecipitation techniques successfully validated that 14-3-3 interacted with EtTRBD in 293T cells. The protein-protein interaction provides a starting point for more in-depth studies on telomerase and telomere regulation in E. tenella.
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