Abstract
The bZIP class of eukaryotic transcriptional regulators utilize a distinct structural motif that consists of a leucine zipper that mediates dimerization and an adjacent basic region that directly contacts DNA. Although models of the protein-DNA complex have been proposed, the basis of DNA-binding specificity is essentially unknown. By genetically selecting for derivatives of yeast GCN4 that activate transcription from promoters containing mutant binding sites, we isolate an altered-specificity mutant in which the invariant asparagine in the basic region of bZIP proteins (Asn-235) has been changed to tryptophan. Wild-type GCN4 binds the optimal site (ATGACTCAT) with much higher affinity than the mutant site (TTGACTCAA), whereas the Trp-235 protein binds these sites with similar affinity. Moreover, the Trp-235, Ala-235, and Gln-235 derivatives differ from GCN4 in their strong discrimination against GTGACTCAC. These results suggest a direct interaction between Asn-235 and the +/- 4 position of the DNA target site and are discussed in terms of the scissors-grip and induced-fork models of bZIP proteins.
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Selected References
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- Aggarwal A. K., Rodgers D. W., Drottar M., Ptashne M., Harrison S. C. Recognition of a DNA operator by the repressor of phage 434: a view at high resolution. Science. 1988 Nov 11;242(4880):899–907. doi: 10.1126/science.3187531. [DOI] [PubMed] [Google Scholar]
- Agre P., Johnson P. F., McKnight S. L. Cognate DNA binding specificity retained after leucine zipper exchange between GCN4 and C/EBP. Science. 1989 Nov 17;246(4932):922–926. doi: 10.1126/science.2530632. [DOI] [PubMed] [Google Scholar]
- Arndt K., Fink G. R. GCN4 protein, a positive transcription factor in yeast, binds general control promoters at all 5' TGACTC 3' sequences. Proc Natl Acad Sci U S A. 1986 Nov;83(22):8516–8520. doi: 10.1073/pnas.83.22.8516. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ebright R. H., Cossart P., Gicquel-Sanzey B., Beckwith J. Mutations that alter the DNA sequence specificity of the catabolite gene activator protein of E. coli. Nature. 1984 Sep 20;311(5983):232–235. doi: 10.1038/311232a0. [DOI] [PubMed] [Google Scholar]
- Gartenberg M. R., Ampe C., Steitz T. A., Crothers D. M. Molecular characterization of the GCN4-DNA complex. Proc Natl Acad Sci U S A. 1990 Aug;87(16):6034–6038. doi: 10.1073/pnas.87.16.6034. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hanes S. D., Brent R. DNA specificity of the bicoid activator protein is determined by homeodomain recognition helix residue 9. Cell. 1989 Jun 30;57(7):1275–1283. doi: 10.1016/0092-8674(89)90063-9. [DOI] [PubMed] [Google Scholar]
- Hill D. E., Hope I. A., Macke J. P., Struhl K. Saturation mutagenesis of the yeast his3 regulatory site: requirements for transcriptional induction and for binding by GCN4 activator protein. Science. 1986 Oct 24;234(4775):451–457. doi: 10.1126/science.3532321. [DOI] [PubMed] [Google Scholar]
- Hochschild A., Douhan J., 3rd, Ptashne M. How lambda repressor and lambda Cro distinguish between OR1 and OR3. Cell. 1986 Dec 5;47(5):807–816. doi: 10.1016/0092-8674(86)90523-4. [DOI] [PubMed] [Google Scholar]
- Hochschild A., Ptashne M. Homologous interactions of lambda repressor and lambda Cro with the lambda operator. Cell. 1986 Mar 28;44(6):925–933. doi: 10.1016/0092-8674(86)90015-2. [DOI] [PubMed] [Google Scholar]
- Hope I. A., Struhl K. Functional dissection of a eukaryotic transcriptional activator protein, GCN4 of yeast. Cell. 1986 Sep 12;46(6):885–894. doi: 10.1016/0092-8674(86)90070-x. [DOI] [PubMed] [Google Scholar]
- Hope I. A., Struhl K. GCN4 protein, synthesized in vitro, binds HIS3 regulatory sequences: implications for general control of amino acid biosynthetic genes in yeast. Cell. 1985 Nov;43(1):177–188. doi: 10.1016/0092-8674(85)90022-4. [DOI] [PubMed] [Google Scholar]
- Hope I. A., Struhl K. GCN4, a eukaryotic transcriptional activator protein, binds as a dimer to target DNA. EMBO J. 1987 Sep;6(9):2781–2784. doi: 10.1002/j.1460-2075.1987.tb02573.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Jordan S. R., Pabo C. O. Structure of the lambda complex at 2.5 A resolution: details of the repressor-operator interactions. Science. 1988 Nov 11;242(4880):893–899. doi: 10.1126/science.3187530. [DOI] [PubMed] [Google Scholar]
- Kissinger C. R., Liu B. S., Martin-Blanco E., Kornberg T. B., Pabo C. O. Crystal structure of an engrailed homeodomain-DNA complex at 2.8 A resolution: a framework for understanding homeodomain-DNA interactions. Cell. 1990 Nov 2;63(3):579–590. doi: 10.1016/0092-8674(90)90453-l. [DOI] [PubMed] [Google Scholar]
- Kouzarides T., Ziff E. Leucine zippers of fos, jun and GCN4 dictate dimerization specificity and thereby control DNA binding. Nature. 1989 Aug 17;340(6234):568–571. doi: 10.1038/340568a0. [DOI] [PubMed] [Google Scholar]
- Landschulz W. H., Johnson P. F., McKnight S. L. The DNA binding domain of the rat liver nuclear protein C/EBP is bipartite. Science. 1989 Mar 31;243(4899):1681–1688. doi: 10.1126/science.2494700. [DOI] [PubMed] [Google Scholar]
- Landschulz W. H., Johnson P. F., McKnight S. L. The leucine zipper: a hypothetical structure common to a new class of DNA binding proteins. Science. 1988 Jun 24;240(4860):1759–1764. doi: 10.1126/science.3289117. [DOI] [PubMed] [Google Scholar]
- Lehming N., Sartorius J., Niemöller M., Genenger G., v Wilcken-Bergmann B., Müller-Hill B. The interaction of the recognition helix of lac repressor with lac operator. EMBO J. 1987 Oct;6(10):3145–3153. doi: 10.1002/j.1460-2075.1987.tb02625.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- O'Neil K. T., Hoess R. H., DeGrado W. F. Design of DNA-binding peptides based on the leucine zipper motif. Science. 1990 Aug 17;249(4970):774–778. doi: 10.1126/science.2389143. [DOI] [PubMed] [Google Scholar]
- O'Shea E. K., Rutkowski R., Kim P. S. Evidence that the leucine zipper is a coiled coil. Science. 1989 Jan 27;243(4890):538–542. doi: 10.1126/science.2911757. [DOI] [PubMed] [Google Scholar]
- Oakley M. G., Dervan P. B. Structural motif of the GCN4 DNA binding domain characterized by affinity cleaving. Science. 1990 May 18;248(4957):847–850. doi: 10.1126/science.2111578. [DOI] [PubMed] [Google Scholar]
- Oliphant A. R., Brandl C. J., Struhl K. Defining the sequence specificity of DNA-binding proteins by selecting binding sites from random-sequence oligonucleotides: analysis of yeast GCN4 protein. Mol Cell Biol. 1989 Jul;9(7):2944–2949. doi: 10.1128/mcb.9.7.2944. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Oliphant A. R., Nussbaum A. L., Struhl K. Cloning of random-sequence oligodeoxynucleotides. Gene. 1986;44(2-3):177–183. doi: 10.1016/0378-1119(86)90180-0. [DOI] [PubMed] [Google Scholar]
- Patel L., Abate C., Curran T. Altered protein conformation on DNA binding by Fos and Jun. Nature. 1990 Oct 11;347(6293):572–575. doi: 10.1038/347572a0. [DOI] [PubMed] [Google Scholar]
- Pu W. T., Struhl K. The leucine zipper symmetrically positions the adjacent basic regions for specific DNA binding. Proc Natl Acad Sci U S A. 1991 Aug 15;88(16):6901–6905. doi: 10.1073/pnas.88.16.6901. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Richardson J. S., Richardson D. C. Amino acid preferences for specific locations at the ends of alpha helices. Science. 1988 Jun 17;240(4859):1648–1652. doi: 10.1126/science.3381086. [DOI] [PubMed] [Google Scholar]
- Sellers J. W., Struhl K. Changing fos oncoprotein to a jun-independent DNA binding protein with GCN4 dimerization specificity by swapping "leucine zippers". Nature. 1989 Sep 7;341(6237):74–76. doi: 10.1038/341074a0. [DOI] [PubMed] [Google Scholar]
- Sellers J. W., Vincent A. C., Struhl K. Mutations that define the optimal half-site for binding yeast GCN4 activator protein and identify an ATF/CREB-like repressor that recognizes similar DNA sites. Mol Cell Biol. 1990 Oct;10(10):5077–5086. doi: 10.1128/mcb.10.10.5077. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Struhl K. Constitutive and inducible Saccharomyces cerevisiae promoters: evidence for two distinct molecular mechanisms. Mol Cell Biol. 1986 Nov;6(11):3847–3853. doi: 10.1128/mcb.6.11.3847. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Struhl K. The DNA-binding domains of the jun oncoprotein and the yeast GCN4 transcriptional activator protein are functionally homologous. Cell. 1987 Sep 11;50(6):841–846. doi: 10.1016/0092-8674(87)90511-3. [DOI] [PubMed] [Google Scholar]
- Talanian R. V., McKnight C. J., Kim P. S. Sequence-specific DNA binding by a short peptide dimer. Science. 1990 Aug 17;249(4970):769–771. doi: 10.1126/science.2389142. [DOI] [PubMed] [Google Scholar]
- Treisman J., Gönczy P., Vashishtha M., Harris E., Desplan C. A single amino acid can determine the DNA binding specificity of homeodomain proteins. Cell. 1989 Nov 3;59(3):553–562. doi: 10.1016/0092-8674(89)90038-x. [DOI] [PubMed] [Google Scholar]
- Vinson C. R., Sigler P. B., McKnight S. L. Scissors-grip model for DNA recognition by a family of leucine zipper proteins. Science. 1989 Nov 17;246(4932):911–916. doi: 10.1126/science.2683088. [DOI] [PubMed] [Google Scholar]
- Vogt P. K., Bos T. J., Doolittle R. F. Homology between the DNA-binding domain of the GCN4 regulatory protein of yeast and the carboxyl-terminal region of a protein coded for by the oncogene jun. Proc Natl Acad Sci U S A. 1987 May;84(10):3316–3319. doi: 10.1073/pnas.84.10.3316. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Weiss M. A., Ellenberger T., Wobbe C. R., Lee J. P., Harrison S. C., Struhl K. Folding transition in the DNA-binding domain of GCN4 on specific binding to DNA. Nature. 1990 Oct 11;347(6293):575–578. doi: 10.1038/347575a0. [DOI] [PubMed] [Google Scholar]
- Wharton R. P., Ptashne M. A new-specificity mutant of 434 repressor that defines an amino acid-base pair contact. 1987 Apr 30-May 6Nature. 326(6116):888–891. doi: 10.1038/326888a0. [DOI] [PubMed] [Google Scholar]
- Wolfner M., Yep D., Messenguy F., Fink G. R. Integration of amino acid biosynthesis into the cell cycle of Saccharomyces cerevisiae. J Mol Biol. 1975 Aug 5;96(2):273–290. doi: 10.1016/0022-2836(75)90348-4. [DOI] [PubMed] [Google Scholar]
- Youderian P., Vershon A., Bouvier S., Sauer R. T., Susskind M. M. Changing the DNA-binding specificity of a repressor. Cell. 1983 Dec;35(3 Pt 2):777–783. doi: 10.1016/0092-8674(83)90110-1. [DOI] [PubMed] [Google Scholar]