Telomere proteins: Specific recognition and protection of the natural termini of Oxytricha macronuclear DNA

Daniel E. Gottschling, Virginia Araxie Zakian

Research output: Contribution to journalArticlepeer-review

226 Scopus citations

Abstract

The macronuclear DNA in the ciliated protozoan O. nova consists of ∼10 7 gene-sized DNA molecules, all of which terminate with 20 bp of C 4 A 4 repeats followed by a 3′ (G 4 T 4 ) 2 single-stranded tail. Two immunologically distinct proteins of 55 and 26 kd, which are tenaciously, but noncovalently associated with Oxytricha macronuclear DNA termini, have been purified. These proteins protect DNA termini from degradation by the exonuclease Bal31. They also facilitate retention of natural and synthetic telomeric DNAs onto nitrocellulose. The Oxytricha proteins are not simply C 4 A 4 -binding proteins. Rather, their efficient binding requires both the 3′ single-stranded (G 4 T 4 ) 2 tail and the adjacent duplex region. Thus, these proteins require both the sequence and the structure of natural DNA termini for efficient binding. As such they represent the first described example of telomeric-specific proteins.

Original languageEnglish (US)
Pages (from-to)195-205
Number of pages11
JournalCell
Volume47
Issue number2
DOIs
StatePublished - Oct 24 1986
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

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