This domain binds single stranded telomeric DNA and adopts an OB fold [1]. It includes the proteins POT1 and CDC13 which have been shown to regulate telomere length, replication and capping [2-4]. POT1 is one component of the shelterin complex that protects telomere-ends from attack by DNA-repair mechanisms [5,6].

1: Conserved structure for single-stranded telomeric DNA recognition. Mitton-Fry RM, Anderson EM, Hughes TR, Lundblad V, Wuttke DS; Science. 2002;296:145-147. PMID:11935027

2: Cdc13 both positively and negatively regulates telomere replication. Chandra A, Hughes TR, Nugent CI, Lundblad V; Genes Dev. 2001;15:404-414. PMID:11230149

3: Pot1 and cell cycle progression cooperate in telomere length regulation. Churikov D, Price CM; Nat Struct Mol Biol. 2008;15:79-84. PMID:18066078

4: Vertebrate POT1 restricts G-overhang length and prevents activation of a telomeric DNA damage checkpoint but is dispensable for overhang protection. Churikov D, Wei C, Price CM; Mol Cell Biol. 2006;26:6971-6982. PMID:16943437

5: [Use of infrared and ultraviolet absorption spectra in the analysis of mixtures in polysaccharide complexes from the tissues of metastases from chorioepithelioma of the uterus]. Le-Van-Dien, Kikot' BS, Savinskaia AP; Vopr Onkol. 1975;21:16-18. PMID:1239117

6: POT1-independent single-strand telomeric DNA binding activities in Brassicaceae. Shakirov EV, McKnight TD, Shippen DE; Plant J. 2009;58:1004-1015. PMID:19228335

7: Shelterin: the protein complex that shapes and safeguards human telomeres. de Lange T; Genes Dev. 2005;19:2100-2110. PMID:16166375