Negatively regulates telomerase activity and participates in chromosome end protection (PubMed:16107718, PubMed:23109676). Binds RNA non-specifically (PubMed:27651456). Associates with a regulatory Pol III-dependent lncRNA, which represses telomerase activity in response to DNA damage (PubMed:23109676). Binds single-stranded telomeric DNA with weak affinity (PubMed:16107718, PubMed:27651456). Interacts with TRB1, TRB2 and TRB3. Expressed at low levels in roots, rosette leaves, cauline leaves, stems and flowers. Belongs to the telombin family.