8EJO image
Entry Detail
PDB ID:
8EJO
Keywords:
DNA BINDING PROTEIN/DNA
Title:
Crystal structure of the homeodomain of Platypus sDUX in complex with DNA
Biological Source:
Source Organism:
Ornithorhynchus anatinus, Homo sapiens
Host Organism:
Escherichia coli K-12
PDB Version:
Deposition Date:
2022-09-18
Release Date:
2023-09-20
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.67 Å
R-Value Free:
0.23
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 43 21 2
8EJO validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Homeobox domain-containing protein
Chain IDs:A, B
Chain Length:71
Number of Molecules:2
Biological Source:Ornithorhynchus anatinus
UniProt ID:A0A6I8NF41 Pfam ID:PF00046
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*GP*CP*GP*TP*AP*AP*TP*CP*TP*AP*AP*TP*CP*AP*AP*CP*A)-3')
Chain IDs:C
Chain Length:17
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*TP*GP*TP*TP*GP*AP*TP*TP*AP*GP*AP*TP*TP*AP*CP*GP*C)-3')
Chain IDs:D
Chain Length:17
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
EDO
Primary Citation
Antagonism among DUX family members evolved from an ancestral toxic single homeodomain protein.
Iscience 26 107823 107823 (2023)
PMID: 37744032 DOI: 10.1016/j.isci.2023.107823

Abstact

Double homeobox (DUX) genes are unique to eutherian mammals, expressed transiently during zygotic genome activation (ZGA) and involved in facioscapulohumeral muscular dystrophy (FSHD) and cancer when misexpressed. We evaluate the 3 human DUX genes and the ancestral single homeobox gene sDUX from the non-eutherian mammal, platypus, and find that DUX4 cytotoxicity is not shared with DUXA or DUXB, but surprisingly is shared with platypus sDUX, which binds DNA as a homodimer and activates numerous ZGA genes and long terminal repeat (LTR) elements. DUXA, although transcriptionally inactive, has DNA binding overlap with DUX4, and DUXA-VP64 activates DUX4 targets and is cytotoxic. DUXA competition antagonizes the activity of DUX4 on its target genes, including in FSHD patient cells. Since DUXA is a DUX4 target gene, this competition potentiates feedback inhibition, constraining the window of DUX4 activity. The DUX gene family therefore comprises antagonistic members of opposing function, with implications for their roles in ZGA, FSHD, and cancer.

Legend

Protein

Chemical

Disease

Primary Citation of related structures
8EJO