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Proteomic investigation of phosphorylation sites in poly(ADP-ribose) polymerase-1 and poly(ADP-ribose) glycohydrolase.

Abstract : Phosphorylation is a very common post-translational modification event known to modulate a wide range of biological responses. Beyond the regulation of protein activity, the interrelation of phosphorylation with other post-translational mechanisms is responsible for the control of diverse signaling pathways. Several observations suggest that phosphorylation of poly(ADP-ribose) polymerase-1 (PARP-1) regulates its activity. There is also accumulating evidence to suggest the establishment of phosphorylation-dependent assembly of PARP-1-associated multiprotein complexes. Although it is relatively straightforward to demonstrate phosphorylation of a defined target, identification of the actual amino acids involved still represents a technical challenge for many laboratories. With the use of a combination of bioinformatics-based predictions tools for generic and kinase-specific phosphorylation sites, in vitro phosphorylation assays and mass spectrometry analysis, we investigated the phosphorylation profile of PARP-1 and poly(ADP-ribose) glycohydrolase (PARG), two major enzymes responsible for poly(ADP-ribose) turnover. Mass spectrometry analysis revealed the phosphorylation of several serine/threonine residues within important regulatory domains and motifs of both enzymes. With the use of in vivo microirradiation-induced DNA damage, we show that altered phosphorylation at specific sites can modify the dynamics of assembly and disassembly of PARP-1 at sites of DNA damage. By documenting and annotating a collection of known and newly identified phosphorylation sites, this targeted proteomics study significantly advances our understanding of the roles of phosphorylation in the regulation of PARP-1 and PARG.
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Submitted on : Wednesday, September 21, 2011 - 3:19:01 PM
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Jean-Philippe Gagné, Xavier Moreel, Pierre Gagné, Yves Labelle, Arnaud Droit, et al.. Proteomic investigation of phosphorylation sites in poly(ADP-ribose) polymerase-1 and poly(ADP-ribose) glycohydrolase.. Journal of Proteome Research, American Chemical Society, 2009, 8 (2), pp.1014-29. ⟨10.1021/pr800810n⟩. ⟨inserm-00354464⟩

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