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Science. 1998 May 1;280(5364):741-4.

Yeast Ku as a regulator of chromosomal DNA end structure.

Author information

  • 1Département de Microbiologie et Infectiologie, Faculté de Médecine, Université de Sherbrooke, 3001 12th Avenue Nord, Sherbrooke, Quebec QC J1H 5N4, Canada.

Abstract

During telomere replication in yeast, chromosome ends acquire an S-phase-specific overhang of the guanosine-rich strand. Here it is shown that in cells lacking Ku, a heterodimeric protein involved in nonhomologous DNA end joining, these overhangs are present throughout the cell cycle. In vivo cross-linking experiments demonstrated that Ku is bound to telomeric DNA. These results show that Ku plays a direct role in establishing a normal DNA end structure on yeast chromosomes, conceivably by functioning as a terminus-binding factor. Because Ku-mediated DNA end joining involving telomeres would result in chromosome instability, our data also suggest that Ku has a distinct function when bound to telomeres.

PMID:
9563951
[PubMed - indexed for MEDLINE]
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