Stimulation of 3′→5′ exonuclease and 3′-phosphodiesterase activities of yeast Apn2 by proliferating cell nuclear antigen

Ildiko Unk, Lajos Haracska, Xavier V. Gomes, Peter M J Burgers, Louise Prakash, Satya Prakash

Research output: Contribution to journalArticle

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Abstract

The Apn2 protein of Saccharomyces cerevisiae contains 3′→5′ exonuclease and 3′-phosphodiesterase activities, and these activities function in the repair of DNA strand breaks that have 3′-damaged termini and which are formed in DNA by the action of oxygen-free radicals. Apn2 also has an AP endonuclease activity and functions in the removal of abasic sites from DNA. Here, we provide evidence for the physical and functional interaction of Apn2 with proliferating cell nuclear antigen (PCNA). As indicated by gel filtration and two-hybrid studies, Apn2 interacts with PCNA both in vitro and in vivo and mutations in the consensus PCNA-binding motif of Apn2 abolish this interaction. Importantly, PCNA stimulates the 3′→5′ exonuclease and 3′-phosphodiesterase activities of Apn2. We have examined the involvement of the interdomain connector loop (IDCL) and of the carboxy-terminal domain of PCNA in Apn2 binding and found that Apn2 binds PCNA via distinct domains dependent upon whether the binding is in the absence or presence of DNA. In the absence of DNA, Apn2 binds PCNA through its IDCL domain, whereas in the presence of DNA, when PCNA has been loaded onto the template-primer junction by replication factor C, the C-terminal domain of PCNA mediates the binding.

Original languageEnglish (US)
Pages (from-to)6480-6486
Number of pages7
JournalMolecular and Cellular Biology
Volume22
Issue number18
DOIs
StatePublished - Sep 2002

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spleen exonuclease
Phosphoric Diester Hydrolases
Proliferating Cell Nuclear Antigen
Yeasts
DNA
Replication Protein C
DNA-(Apurinic or Apyrimidinic Site) Lyase
Saccharomyces cerevisiae Proteins
DNA Breaks

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cell Biology

Cite this

Stimulation of 3′→5′ exonuclease and 3′-phosphodiesterase activities of yeast Apn2 by proliferating cell nuclear antigen. / Unk, Ildiko; Haracska, Lajos; Gomes, Xavier V.; Burgers, Peter M J; Prakash, Louise; Prakash, Satya.

In: Molecular and Cellular Biology, Vol. 22, No. 18, 09.2002, p. 6480-6486.

Research output: Contribution to journalArticle

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