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	GCN4 (PDB [[2zta]] by itself, [[1ysa]] bound to DNA) is a eukaryotic transcription factor first isolated from Saccharomyces cerevisiae, also known as Baker's Yeast. The first 'leucine zipper' model was coined by Landshulz et al. in 1988. Today, while the name has stayed the same, we no longer view the leucine binding region in an inter-collated manner, but as leucines meeting face to face <ref name="abc"> Oas, T. G.; McIntosh, L. P.; O'Shea, E. K.; Dahlquist, F. W.; and Kim, P. S. Biochemistry 1990 29 (12), 2891-2894 </ref>. (see heptad repeat section) GCN4 binds to promoter regions AP-1 and ATF/CREB to induce transcription via the C terminal basic residues of the two symmetric alpha helices.<ref>~~doi:10~~.~~1016/0092~~-~~8674~~</ref>		GCN4 (PDB [[2zta]] by itself, [[1ysa]] bound to DNA) is a eukaryotic transcription factor first isolated from Saccharomyces cerevisiae, also known as Baker's Yeast. The first 'leucine zipper' model was coined by Landshulz et al. in 1988. Today, while the name has stayed the same, we no longer view the leucine binding region in an inter-collated manner, but as leucines meeting face to face <ref name="abc"> Oas, T. G.; McIntosh, L. P.; O'Shea, E. K.; Dahlquist, F. W.; and Kim, P. S. Biochemistry 1990 29 (12), 2891-2894 </ref>. (see heptad repeat section) GCN4 binds to promoter regions AP-1 and ATF/CREB to induce transcription via the C terminal basic residues of the two symmetric alpha helices.<ref> Hope, I. A.; Struhl,K. Cell, Volume 46, Issue 6, 12 September 1986, Pages 885-894</ref>