Parallel SCF adaptor capture proteomics reveals a role for SCFFBXL17 in NRF2 activation via BACH1 repressor turnover

Mol Cell. 2013 Oct 10;52(1):9-24. doi: 10.1016/j.molcel.2013.08.018. Epub 2013 Sep 12.

Abstract

Modular cullin-RING E3 ubiquitin ligases (CRLs) use substrate binding adaptor proteins to specify target ubiquitylation. Many of the ~200 human CRL adaptor proteins remain poorly studied due to a shortage of efficient methods to identify biologically relevant substrates. Here, we report the development of parallel adaptor capture (PAC) proteomics and its use to systematically identify candidate targets for the leucine-rich repeat family of F-box proteins (FBXLs) that function with SKP1-CUL1-F-box protein (SCF) E3s. In validation experiments, we identify the unstudied F-box protein FBXL17 as a regulator of the NFR2 oxidative stress pathway. We demonstrate that FBXL17 controls the transcription of the NRF2 target HMOX1 via turnover of the transcriptional repressor BACH1 in the absence or presence of extrinsic oxidative stress. This work identifies a role for SCF(FBXL17) in controlling the threshold for NRF2-dependent gene activation and provides a framework for elucidating the functions of CRL adaptor proteins.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Basic-Leucine Zipper Transcription Factors / genetics
  • Basic-Leucine Zipper Transcription Factors / metabolism*
  • F-Box Proteins / genetics
  • F-Box Proteins / metabolism*
  • Fanconi Anemia Complementation Group Proteins / genetics
  • Fanconi Anemia Complementation Group Proteins / metabolism*
  • Gene Expression Regulation
  • HCT116 Cells
  • HEK293 Cells
  • HeLa Cells
  • Heme Oxygenase-1 / metabolism
  • Humans
  • NF-E2-Related Factor 2 / genetics
  • NF-E2-Related Factor 2 / metabolism
  • Oxidative Stress
  • Promoter Regions, Genetic
  • Protein Binding
  • Protein Interaction Domains and Motifs
  • Protein Interaction Mapping
  • Proteomics* / methods
  • RNA Interference
  • Reproducibility of Results
  • SKP Cullin F-Box Protein Ligases / genetics
  • SKP Cullin F-Box Protein Ligases / metabolism*
  • Transcription, Genetic
  • Transfection

Substances

  • BACH1 protein, human
  • Basic-Leucine Zipper Transcription Factors
  • F-Box Proteins
  • FBXL17 protein, human
  • Fanconi Anemia Complementation Group Proteins
  • NF-E2-Related Factor 2
  • NFE2L2 protein, human
  • HMOX1 protein, human
  • Heme Oxygenase-1
  • SKP Cullin F-Box Protein Ligases