Intra-mitochondrial poly(ADP-ribosyl)ation

Potential role for alpha-ketoglutarate dehydrogenase

Eszter Pankotai, Zsombor Lacza, Marianna Murányi, Csaba Szabo

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Poly(ADP-ribose) polymerase (PARP) is an intracellular enzyme involved in DNA repair and in building poly-ADP-ribose polymers on nuclear proteins using NAD+. While the majority of PARP resides in the nucleus, several studies indicated that PARP may also be located in the cytosol or in the mitochondrial matrix. In this study we found several poly-ADP-ribosylated proteins in isolated rat liver mitochondria following hydrogen peroxide (H2O2) or nitric oxide donor treatment. Protein poly-ADP-ribosylation was more intense in isolated mitochondria than in whole tissue homogenates and it was not associated with increased nuclear PARP activity. We identified five poly-ADP-ribose (PAR) positive mitochondrial bands by protein mass fingerprinting. All of the identified enzymes exhibited decreased activity or decreased levels following oxidative or nitrosative stress. One of the identified proteins is dihydrolipoamide dehydrogenase (DLDH), a component of the alpha-ketoglutarate dehydrogenase (KGDH) complex, which uses NAD+ as a substrate. This raised the possibility that KGDH may have a PARP-like enzymatic activity. The intrinsic PARP activity of KGDH and DLDH was confirmed using a colorimetric PARP assay kit and by the incubation of the recombinant enzymes with H2O2. The KGDH enzyme may, therefore, have a novel function as a PARP-like enzyme, which may play a role in regulating intramitochondrial NAD+ and poly(ADP-ribose) homeostasis, with possible roles in physiology and pathophysiology.

Original languageEnglish (US)
Pages (from-to)159-164
Number of pages6
JournalMitochondrion
Volume9
Issue number2
DOIs
StatePublished - Apr 2009

Fingerprint

Ketoglutarate Dehydrogenase Complex
Poly(ADP-ribose) Polymerases
Adenosine Diphosphate
Poly Adenosine Diphosphate Ribose
Dihydrolipoamide Dehydrogenase
NAD
Enzymes
Oxidoreductases
Peptide Mapping
Nitric Oxide Donors
Liver Mitochondrion
Mitochondrial Proteins
Nuclear Proteins
DNA Repair
Cytosol
Hydrogen Peroxide
Mitochondria
Polymers
Proteins
Homeostasis

Keywords

  • Alpha-ketoglutarate dehydrogenase
  • Dihydrolipoamide dehydrogenase
  • Mitochondria
  • Nitric oxide
  • Oxidative stress
  • Poly(ADP-ribose) polymerase

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology
  • Molecular Medicine

Cite this

Intra-mitochondrial poly(ADP-ribosyl)ation : Potential role for alpha-ketoglutarate dehydrogenase. / Pankotai, Eszter; Lacza, Zsombor; Murányi, Marianna; Szabo, Csaba.

In: Mitochondrion, Vol. 9, No. 2, 04.2009, p. 159-164.

Research output: Contribution to journalArticle

Pankotai, Eszter ; Lacza, Zsombor ; Murányi, Marianna ; Szabo, Csaba. / Intra-mitochondrial poly(ADP-ribosyl)ation : Potential role for alpha-ketoglutarate dehydrogenase. In: Mitochondrion. 2009 ; Vol. 9, No. 2. pp. 159-164.
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