TERF2IP: Proteins and Enzymes

Mammalian telomeric proteins, including TRF1, TRF2, tankyrase, and TIN2 have no recognized orthologs in budding yeast. However, human Rap1 (hRap1) is an ortholog of the yeast telomeric protein, scRap1p. hRap1 is a homodimer, has three conserved sequence motifs in common with scRap1, is located at telomeres, and plays a role in telomere length regulation. Although scRap1 binds telomeric DNA directly, hRap1 is recruited to telomeres by TRF2 and binds it with its C-terminus, rather than directly binding DNA.