1HDD image
Deposition Date 1991-09-16
Release Date 1992-01-15
Last Version Date 2024-05-22
Entry Detail
PDB ID:
1HDD
Keywords:
TRANSCRIPTION/DNA
Title:
CRYSTAL STRUCTURE OF AN ENGRAILED HOMEODOMAIN-DNA COMPLEX AT 2.8 ANGSTROMS RESOLUTION: A FRAMEWORK FOR UNDERSTANDING HOMEODOMAIN-DNA INTERACTIONS
Biological Source:
Source Organism:
Drosophila melanogaster (Taxon ID: 7227)
synthetic construct (Taxon ID: 32630)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.80 Å
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
C 1 2 1
1HDD validation report
Macromolecular Entities
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*TP*TP*TP*TP*GP*CP*CP*AP*TP*GP*TP*AP*AP*TP*TP*AP*C P*CP*TP*AP*A)-3')
Chain IDs:A
Chain Length:21
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*AP*TP*TP*AP*GP*GP*TP*AP*AP*TP*TP*AP*CP*AP*TP*GP*G P*CP*AP*AP*A)-3')
Chain IDs:B
Chain Length:21
Number of Molecules:1
Biological Source:synthetic construct
Protein Blast
Polymer Type:polypeptide(L)
Molecule:PROTEIN (ENGRAILED HOMEODOMAIN)
Gene (Uniprot):en
Chain IDs:C, D
Chain Length:61
Number of Molecules:2
Biological Source:Drosophila melanogaster
UniProt ID:P02836 Pfam ID:PF00046
Ligand Molecules
NA
Primary Citation
Crystal structure of an engrailed homeodomain-DNA complex at 2.8 A resolution: a framework for understanding homeodomain-DNA interactions.
Cell(Cambridge,Mass.) 63 579 590 (1990)
PMID: 1977522 DOI: 10.1016/0092-8674(90)90453-L

Abstact

The crystal structure of a complex containing the engrailed homeodomain and a duplex DNA site has been determined at 2.8 A resolution and refined to a crystallographic R factor of 24.4%. In this complex, two separate regions of the 61 amino acid polypeptide contact a TAAT subsite. An N-terminal arm fits into the minor groove, and the side chains of Arg-3 and Arg-5 make contacts near the 5' end of this "core consensus" binding site. An alpha helix fits into the major groove, and the side chains of IIe-47 and Asn-51 contact base pairs near the 3' end of the TAAT site. This "recognition helix" is part of a structurally conserved helix-turn-helix unit, but these helices are longer than the corresponding helices in the lambda repressor, and the relationship between the helix-turn-helix unit and the DNA is significantly different.

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Disease

Primary Citation of related structures
1HDD