Probable transcription activator (PubMed:19084000). Binds telomeric DNA containing repeats of the sequence, 5'-TTAGGC-3' (PubMed:16267406). Binds to end-1 promoter, activating end-1 expression, which is required for endoderm specification during embryonic development (PubMed:19084000). localizes to nuclei of interphase cells throughout early embryogenesis. Localizes to the nucleus in a lit-1 dependent manner. Transiently asymmetrically localizes during telophase of the dividing EMS cell with higher levels in the future E cell nucleus and low or undetectable levels in that of the MS cell. First expressed in blastomeres at the two cell stage of embryogenesis (PubMed:19084000). Also expressed in germline-specific P granules of early embryos (PubMed:19084000). Sterile due to lack of oocytes (PubMed:25439098). Defective locomotion, marked by a 3-fold reduction in speed (PubMed:25439098). RNAi-mediated knockdown causes embryonic lethality (PubMed:19084000). RNAi-mediated knockdown substantially reduces expression of end-1 (PubMed:19084000). RNAi-mediated knockdown abolishes formation of endoderm in 3% of embryos and in 35% of embryos on a mom-5 mutant background (PubMed:19084000). Belongs to the PUR DNA-binding protein family.