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Crystal structure of the Kelch domain of human Keap1.

Keap1 is a substrate adaptor protein for an ubiquitin ligase complex that targets the Nrf2 transcription factor for degradation. Keap1 binds Nrf2 through its C-terminal Kelch domain, which contains six copies of the evolutionarily conserved kelch repeat sequence motif. The structure of the Kelch domain from human Keap1 has been determined by x-ray crystallography to a resolution of 1.85 A. The Kelch domain forms a 6-bladed beta-propeller structure, with residues at the C terminus forming the first strand in the first blade. Key structural roles have been identified for the highly conserved glycine, tyrosine, and tryptophan residues that define the kelch repeat sequence motif. In addition, we show that substitution of a single amino acid located within a loop that extends out from the bottom of the beta-propeller structure abolishes binding of Nrf2. The structure of the Kelch domain of Keap1 represents a high quality model for the superfamily of eukaryotic kelch repeat proteins and provides insight into how disease-causing mutations perturb the structural integrity of the Kelch domain.

Pubmed ID: 15475350


  • Li X
  • Zhang D
  • Hannink M
  • Beamer LJ


The Journal of biological chemistry

Publication Data

December 24, 2004

Associated Grants

  • Agency: NIGMS NIH HHS, Id: GM59213
  • Agency: NCI NIH HHS, Id: P50 CA103130

Mesh Terms

  • Amino Acid Sequence
  • Binding Sites
  • Conserved Sequence
  • Crystallization
  • Crystallography, X-Ray
  • DNA-Binding Proteins
  • Humans
  • Immunosorbent Techniques
  • Intracellular Signaling Peptides and Proteins
  • Models, Molecular
  • Molecular Sequence Data
  • Molecular Structure
  • NF-E2-Related Factor 2
  • Peptide Fragments
  • Point Mutation
  • Proteins
  • Repetitive Sequences, Nucleic Acid
  • Sequence Alignment
  • Trans-Activators