7X5E image
Entry Detail
PDB ID:
7X5E
Title:
Nrf2-MafG heterodimer bound with CsMBE1
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2022-03-04
Release Date:
2022-11-09
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.24
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Transcription factor MafG
Chain IDs:A, E
Chain Length:104
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Nuclear factor erythroid 2-related factor 2
Chain IDs:B, F
Chain Length:113
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*GP*TP*TP*GP*CP*TP*GP*AP*CP*TP*CP*AP*TP*CP*AP*T)-3')
Chain IDs:C, G
Chain Length:16
Number of Molecules:2
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*CP*AP*TP*GP*AP*TP*GP*AP*GP*TP*CP*AP*GP*CP*AP*A)-3')
Chain IDs:D, H
Chain Length:16
Number of Molecules:2
Biological Source:synthetic construct
Ligand Molecules
Primary Citation
Structural basis of transcription regulation by CNC family transcription factor, Nrf2.
Nucleic Acids Res. 50 12543 12557 (2022)
PMID: 36454022 DOI: 10.1093/nar/gkac1102

Abstact

Several basic leucine zipper (bZIP) transcription factors have accessory motifs in their DNA-binding domains, such as the CNC motif of CNC family or the EHR motif of small Maf (sMaf) proteins. CNC family proteins heterodimerize with sMaf proteins to recognize CNC-sMaf binding DNA elements (CsMBEs) in competition with sMaf homodimers, but the functional role of the CNC motif remains elusive. In this study, we report the crystal structures of Nrf2/NFE2L2, a CNC family protein regulating anti-stress transcriptional responses, in a complex with MafG and CsMBE. The CNC motif restricts the conformations of crucial Arg residues in the basic region, which form extensive contact with the DNA backbone phosphates. Accordingly, the Nrf2-MafG heterodimer has approximately a 200-fold stronger affinity for CsMBE than canonical bZIP proteins, such as AP-1 proteins. The high DNA affinity of the CNC-sMaf heterodimer may allow it to compete with the sMaf homodimer on target genes without being perturbed by other low-affinity bZIP proteins with similar sequence specificity.

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Primary Citation of related structures