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Substrates of IAP ubiquitin ligases identified with a designed orthogonal E3 ligase, the NEDDylator.

Molecular cell | Jan 24, 2013

Inhibitors of Apoptosis Protein (IAPs) are guardian ubiquitin ligases that keep classic proapoptotic proteins in check. Systematic identification of additional IAP substrates is challenged by the heterogeneity and sheer number of ubiquitinated proteins (>5,000). Here we report a powerful catalytic tagging tool, the NEDDylator, which fuses a NEDD8 E2-conjugating enzyme, Ubc12, to the ubiquitin ligase, XIAP or cIAP1. This permits transfer of the rare ubiquitin homolog NEDD8 to the ubiquitin E3 substrates, allowing them to be efficiently purified for LC-MS/MS identification. We have identified >50 potential IAP substrates of both cytosolic and mitochondrial origin that bear hallmark N-terminal IAP binding motifs. These substrates include the recently discovered protein phosphatase PGAM5, which we show is proteolytically processed, accumulates in cytosol during apoptosis, and sensitizes cells to death. These studies reveal mechanisms and antagonistic partners for specific IAPs, and provide a powerful technology for labeling binding partners in transient protein-protein complexes.

Pubmed ID: 23201124 RIS Download

Mesh terms: Amino Acid Sequence | Apoptosis | Carrier Proteins | Caspase 7 | Consensus Sequence | Humans | Inhibitor of Apoptosis Proteins | Jurkat Cells | Mitochondrial Proteins | Molecular Sequence Data | Peptide Fragments | Phosphoprotein Phosphatases | Protein Engineering | Protein Interaction Domains and Motifs | Protein Processing, Post-Translational | Recombinant Fusion Proteins | Ubiquitin-Protein Ligases | Ubiquitination | Ubiquitins | X-Linked Inhibitor of Apoptosis Protein

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Associated grants

  • Agency: NIGMS NIH HHS, Id: P41 GM103481
  • Agency: NIGMS NIH HHS, Id: R01 GM081051
  • Agency: NIGMS NIH HHS, Id: R01 GM097316
  • Agency: NCRR NIH HHS, Id: P41RR001614
  • Agency: NCRR NIH HHS, Id: S10 RR026662
  • Agency: NCRR NIH HHS, Id: P41 RR001614
  • Agency: NCRR NIH HHS, Id: 1S10RR026662

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