Subunit of the TTT complex and the telomere cap complex; subunit of the TTT Hsp90 cochaperone complex that is involved in chromatin remodeling and telomeric chromatin regulation, and  involved in chromatin remodeling and the telomere cap complex; DNA-binding protein specific to single-stranded yeast telomeric DNA repeats; required for telomere length regulation and telomere position effect; involved in the stability or biogenesis of PIKKs such as TORC1