Cell. 1992 Dec 24;71(7):1223-37.

The GCN4 basic region leucine zipper binds DNA as a dimer of uninterrupted alpha helices: crystal structure of the protein-DNA complex.

Ellenberger TE, Brandl CJ, Struhl K, Harrison SC.

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Harvard University, Department of Biochemistry and Molecular Biology, Cambridge, Massachusetts 02138.

Abstract

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.

PMID:: 1473154; [PubMed - indexed for MEDLINE]

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Structures reported by this article

The Gcn4 Basic Region Leucine Zipper Binds Dna As A Dimer Of Uninterrupted Alpha Helices: Crystal Structure Of The Protein-Dna Complex

PDB: 1YSA

Source: synthetic construct, Saccharomyces cerevisiae

Method: X-Ray Diffraction

Resolution: 2.9 Å

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The GCN4 basic region leucine zipper binds DNA as a dimer of uninterrupted alpha helices: crystal structure of the protein-DNA complex.

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