Identification of human Rap1: implications for telomere evolution.

Abstract:

:It has been puzzling that mammalian telomeric proteins, including TRF1, TRF2, tankyrase, and TIN2 have no recognized orthologs in budding yeast. Here, we describe a human protein, hRap1, that is an ortholog of the yeast telomeric protein, scRap1p. hRap1 has three conserved sequence motifs in common with scRap1, is located at telomeres, and affects telomere length. However, while scRap1 binds telomeric DNA directly, hRap1 is recruited to telomeres by TRF2. Extending the comparison of telomeric proteins to fission yeast, we identify S. pombe Taz1 as a TRF ortholog, indicating that TRFs are conserved at eukaryotic telomeres. The data suggest that ancestral telomeres, like those of vertebrates, contained a TRF-like protein as well as Rap1. We propose that budding yeast preserved Rap1 at telomeres but lost the TRF component, possibly concomitant with a change in the telomeric repeat sequence.

journal_name

Cell

journal_title

Cell

authors

Li B,Oestreich S,de Lange T

doi

10.1016/s0092-8674(00)80858-2

subject

Has Abstract

pub_date

2000-05-26 00:00:00

pages

471-83

issue

5

eissn

0092-8674

issn

1097-4172

pii

S0092-8674(00)80858-2

journal_volume

101

pub_type

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