1QBJ image
Deposition Date 1999-04-22
Release Date 1999-07-02
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1QBJ
Keywords:
HYDROLASE/DNA
Title:
CRYSTAL STRUCTURE OF THE ZALPHA Z-DNA COMPLEX
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.10 Å
R-Value Free:
0.26
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 4 21 2
1QBJ validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:PROTEIN (DOUBLE-STRANDED RNA SPECIFIC ADENOSINE DEAMINASE (ADAR1))
Gene (Uniprot):ADAR
Chain IDs:D (auth: A), E (auth: B), F (auth: C)
Chain Length:81
Number of Molecules:3
Biological Source:Homo sapiens
UniProt ID:P55265 Pfam ID:PF02295 EC:3.5.4.37
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*TP*CP*GP*CP*GP*CP*G)-3')
Chain IDs:A (auth: D), B (auth: E), C (auth: F)
Chain Length:7
Number of Molecules:3
Biological Source:
Primary Citation
Crystal structure of the Zalpha domain of the human editing enzyme ADAR1 bound to left-handed Z-DNA.
Science 284 1841 1845 (1999)
PMID: 10364558 DOI: 10.1126/science.284.5421.1841

Abstact

The editing enzyme double-stranded RNA adenosine deaminase includes a DNA binding domain, Zalpha, which is specific for left-handed Z-DNA. The 2.1 angstrom crystal structure of Zalpha complexed to DNA reveals that the substrate is in the left-handed Z conformation. The contacts between Zalpha and Z-DNA are made primarily with the "zigzag" sugar-phosphate backbone, which provides a basis for the specificity for the Z conformation. A single base contact is observed to guanine in the syn conformation, characteristic of Z-DNA. Intriguingly, the helix-turn-helix motif, frequently used to recognize B-DNA, is used by Zalpha to contact Z-DNA.

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Primary Citation of related structures
1QBJ