Identification and characterization of mitochondrial abasic (AP)-endonuclease in mammalian cells

Ranajoy Chattopadhyay, Lee Wiederhold, Bartosz Szczesny, Istvan Boldogh, Tapas Hazra, Tadahide Izumi, Sankar Mitra

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

Abasic (AP)-endonuclease (APE) is responsible for repair of AP sites, and single-strand DNA breaks with 3′ blocking groups that are generated either spontaneously or during repair of damaged or abnormal bases via the DNA base excision repair (BER) pathway in both nucleus and mitochondria. Mammalian cells express only one nuclear APE, 36 kDa APE1, which is essential for survival. Mammalian mitochondrial (mt) BER enzymes other than mtAPE have been characterized. In order to identify and characterize mtAPE, we purified the APE activity from beef liver mitochondria to near homogeneity, and showed that the mtAPE which has 3-fold higher specific activity relative to APE1 is derived from the latter with deletion of 33 N-terminal residues which contain the nuclear localization signal. The mtAPE-sized product could be generated by incubating 35 S-labeled APE1 with crude mitochondrial extract, but not with cytosolic or nuclear extract, suggesting that cleavage of APE1 by a specific mitochondria-associated N-terminal peptidase is a prerequisite for mitochondrial import. The low abundance of mtAPE, particularly in cultured cells might be the reason for its earlier lack of detection by western analysis.

Original languageEnglish
Pages (from-to)2067-2076
Number of pages10
JournalNucleic Acids Research
Volume34
Issue number7
DOIs
StatePublished - 2006

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DNA-(Apurinic or Apyrimidinic Site) Lyase
DNA Repair
Mitochondria
Single-Stranded DNA Breaks
Nuclear Localization Signals
Liver Mitochondrion
Complex Mixtures
Cultured Cells
DNA
Enzymes

ASJC Scopus subject areas

  • Genetics

Cite this

Identification and characterization of mitochondrial abasic (AP)-endonuclease in mammalian cells. / Chattopadhyay, Ranajoy; Wiederhold, Lee; Szczesny, Bartosz; Boldogh, Istvan; Hazra, Tapas; Izumi, Tadahide; Mitra, Sankar.

In: Nucleic Acids Research, Vol. 34, No. 7, 2006, p. 2067-2076.

Research output: Contribution to journalArticle

Chattopadhyay, Ranajoy ; Wiederhold, Lee ; Szczesny, Bartosz ; Boldogh, Istvan ; Hazra, Tapas ; Izumi, Tadahide ; Mitra, Sankar. / Identification and characterization of mitochondrial abasic (AP)-endonuclease in mammalian cells. In: Nucleic Acids Research. 2006 ; Vol. 34, No. 7. pp. 2067-2076.
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