Single stranded DNA-binding protein found at TG1-3 telomere G-tails; key roles regulating telomerase, telomere end protection, and telomere replication; can dynamically intermolecularly exchange between telomeric single-stranded DNA molecules; essential function is telomere capping; forms homodimer via N-terminus; disruption of dimerization leads to short telomeres; autophagy and proteasome are involved in Cdc13p degradation; differentially phosphorylated through cell cycle