DNA-binding transcription regulator; involved in transcription activation, repression, chromatin silencing, telomere length maintenance; represses divergent noncoding transcription at highly expressed genes, prevents initiation at cryptic promoters; recruits Sir complex to telomeric DNA; forms telomere hyperclusters in quiescent cells; arrays of telomere-bound Rap1p stall condensin-induced DNA loop extrusion causing local chromatin decompaction in anaphase; relocalizes to cytosol under hypoxia