Component of the telomerase ribonucleoprotein (RNP) complex that is essential for the positive regulation of telomere length (PubMed:16107718, PubMed:17627276, PubMed:25697340). Binds RNA non-specifically (PubMed:27651456). Binds specifically single-stranded telomeric DNA (PubMed:16107718, PubMed:27651456). Not required to recruit telomerase to telomeres, but stimulates TER1 RNP repeat addition processivity (PubMed:25329641). Component of the telomerase holoenzyme complex at least composed of TERT, CBF5 and POT1a (PubMed:18212040) (Probable). The RNA molecule associated to the telomerase complex, and providing a template for telomeric DNA synthesis, is most likely TR and not TER1 as described previously (PubMed:31754033, PubMed:31392988, PubMed:31754031). Interacts with the N-terminal part of TERT (PubMed:17911168). Interacts with CBF5 (PubMed:18212040, PubMed:30834599). Interacts with CTC1 and STN1 (PubMed:25329641, PubMed:25697340). Does not interact with TEN1 (PubMed:25329641). Localizes to telomeres in S-phase (PubMed:17627276). Localizes to cytoplasmic foci (PubMed:30834599). Expressed in roots, rosette leaves, cauline leaves, stems and flowers. Belongs to the telombin family. Was originally thought to associate with TER1, the RNA molecule of the telomerase complex that provides a template for telomeric DNA synthesis (PubMed:21164032). The authentic RNA subunit of the telomerase that associates with POT1A has been recently shown to be TR and not TER1 (PubMed:31392988, PubMed:31754031). The original publication has been retracted.