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Entry Detail
PDB ID:
1YSA
Keywords:
TRANSCRIPTION/DNA
Title:
THE GCN4 BASIC REGION LEUCINE ZIPPER BINDS DNA AS A DIMER OF UNINTERRUPTED ALPHA HELICES: CRYSTAL STRUCTURE OF THE PROTEIN-DNA COMPLEX
Biological Source:
Source Organism:
Saccharomyces cerevisiae
PDB Version:
Deposition Date:
1993-08-09
Release Date:
1993-10-31
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.90 Å
R-Value Observed:
0.23
Space Group:
P 21 21 21
1YSA validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:PROTEIN (GCN4)
Chain IDs:C, D
Chain Length:58
Number of Molecules:2
Biological Source:Saccharomyces cerevisiae
UniProt ID:P03069 Pfam ID:PF07716
Primary Citation
The GCN4 basic region leucine zipper binds DNA as a dimer of uninterrupted alpha helices: crystal structure of the protein-DNA complex.
Cell(Cambridge,Mass.) 71 1223 1237 (1992)
PMID: 1473154 DOI: 10.1016/S0092-8674(05)80070-4

Abstact

The yeast transcriptional activator GCN4 is 1 of over 30 identified eukaryotic proteins containing the basic region leucine zipper (bZIP) DNA-binding motif. We have determined the crystal structure of the GCN4 bZIP element complexed with DNA at 2.9 A resolution. The bZIP dimer is a pair of continuous alpha helices that form a parallel coiled coil over their carboxy-terminal 30 residues and gradually diverge toward their amino termini to pass through the major groove of the DNA-binding site. The coiled-coil dimerization interface is oriented almost perpendicular to the DNA axis, giving the complex the appearance of the letter T. There are no kinks or sharp bends in either bZIP monomer. Numerous contacts to DNA bases and phosphate oxygens are made by basic region residues that are conserved in the bZIP protein family. The details of the bZIP dimer interaction with DNA can explain recognition of the AP-1 site by the GCN4 protein.

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Primary Citation of related structures
1YSA