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The transcriptional activator GCN4 contains multiple activation domains that are critically dependent on hydrophobic amino acids

Abstract

GCN4 is a transcriptional activator in the bZIP family that regulates amino acid biosynthetic genes in the yeast Saccharomyces cerevisiae. Previous work suggested that the principal activation domain of GCN4 is a highly acidic segment of approximately 40 amino acids located in the center of the protein. We conducted a mutational analysis of GCN4 with a single-copy allele expressed under the control of the native promoter and translational control elements. Our results indicate that GCN4 contains two activation domains of similar potency that can function independently to promote high-level transcription of the target genes HIS3 and HIS4. One of these domains is coincident with the acidic activation domain defined previously; the other extends over the N-terminal one-third of the protein. Both domains are partially dependent on the coactivator protein ADA2. Each domain appears to be composed of two or more small subdomains that have additive effects on transcription and that can cooperate in different combinations to promote high-level expression of HIS3 and HIS4. At least three of these subdomains are critically dependent on bulky hydrophobic amino acids for their function. Five of the important hydrophobic residues, Phe-97, Phe-98, Met-107, Tyr-110, and Leu-113, fall within a region of proposed sequence homology between GCN4 and the herpesvirus acidic activator VP16. The remaining three residues, Trp-120, Leu-123, and Phe-124, are highly conserved between GCN4 and its Neurospora counterpart, cpc-1. Because of the functional redundancy in the activation domain, mutations at positions 97 and 98 must be combined with mutations at positions 120 to 124 to observe a substantial reduction in activation by full-length GCN4, and substitution of all eight hydrophobic residues was required to inactivate full-length GCN4. These hydrophobic residues may mediate important interactions between GCN4 and one or more of its target proteins in the transcription initiation complex.

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Selected References

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  1. Arndt K. T., Styles C., Fink G. R. Multiple global regulators control HIS4 transcription in yeast. Science. 1987 Aug 21;237(4817):874–880. doi: 10.1126/science.3303332. [DOI] [PubMed] [Google Scholar]
  2. Berger S. L., Piña B., Silverman N., Marcus G. A., Agapite J., Regier J. L., Triezenberg S. J., Guarente L. Genetic isolation of ADA2: a potential transcriptional adaptor required for function of certain acidic activation domains. Cell. 1992 Jul 24;70(2):251–265. doi: 10.1016/0092-8674(92)90100-q. [DOI] [PubMed] [Google Scholar]
  3. Boeke J. D., Trueheart J., Natsoulis G., Fink G. R. 5-Fluoroorotic acid as a selective agent in yeast molecular genetics. Methods Enzymol. 1987;154:164–175. doi: 10.1016/0076-6879(87)54076-9. [DOI] [PubMed] [Google Scholar]
  4. Bradford M. M. A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Anal Biochem. 1976 May 7;72:248–254. doi: 10.1016/0003-2697(76)90527-3. [DOI] [PubMed] [Google Scholar]
  5. Buratowski S. The basics of basal transcription by RNA polymerase II. Cell. 1994 Apr 8;77(1):1–3. doi: 10.1016/0092-8674(94)90226-7. [DOI] [PubMed] [Google Scholar]
  6. Cress W. D., Triezenberg S. J. Critical structural elements of the VP16 transcriptional activation domain. Science. 1991 Jan 4;251(4989):87–90. doi: 10.1126/science.1846049. [DOI] [PubMed] [Google Scholar]
  7. Ellenberger T. E., Brandl C. J., Struhl K., Harrison S. C. The GCN4 basic region leucine zipper binds DNA as a dimer of uninterrupted alpha helices: crystal structure of the protein-DNA complex. Cell. 1992 Dec 24;71(7):1223–1237. doi: 10.1016/s0092-8674(05)80070-4. [DOI] [PubMed] [Google Scholar]
  8. Geisberg J. V., Lee W. S., Berk A. J., Ricciardi R. P. The zinc finger region of the adenovirus E1A transactivating domain complexes with the TATA box binding protein. Proc Natl Acad Sci U S A. 1994 Mar 29;91(7):2488–2492. doi: 10.1073/pnas.91.7.2488. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Georgakopoulos T., Thireos G. Two distinct yeast transcriptional activators require the function of the GCN5 protein to promote normal levels of transcription. EMBO J. 1992 Nov;11(11):4145–4152. doi: 10.1002/j.1460-2075.1992.tb05507.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Gill G., Pascal E., Tseng Z. H., Tjian R. A glutamine-rich hydrophobic patch in transcription factor Sp1 contacts the dTAFII110 component of the Drosophila TFIID complex and mediates transcriptional activation. Proc Natl Acad Sci U S A. 1994 Jan 4;91(1):192–196. doi: 10.1073/pnas.91.1.192. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Goodrich J. A., Hoey T., Thut C. J., Admon A., Tjian R. Drosophila TAFII40 interacts with both a VP16 activation domain and the basal transcription factor TFIIB. Cell. 1993 Nov 5;75(3):519–530. doi: 10.1016/0092-8674(93)90386-5. [DOI] [PubMed] [Google Scholar]
  12. Hahn S. Structure(?) and function of acidic transcription activators. Cell. 1993 Feb 26;72(4):481–483. doi: 10.1016/0092-8674(93)90064-w. [DOI] [PubMed] [Google Scholar]
  13. Hardwick J. M., Tse L., Applegren N., Nicholas J., Veliuona M. A. The Epstein-Barr virus R transactivator (Rta) contains a complex, potent activation domain with properties different from those of VP16. J Virol. 1992 Sep;66(9):5500–5508. doi: 10.1128/jvi.66.9.5500-5508.1992. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Hinnebusch A. G., Fink G. R. Positive regulation in the general amino acid control of Saccharomyces cerevisiae. Proc Natl Acad Sci U S A. 1983 Sep;80(17):5374–5378. doi: 10.1073/pnas.80.17.5374. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Hoey T., Weinzierl R. O., Gill G., Chen J. L., Dynlacht B. D., Tjian R. Molecular cloning and functional analysis of Drosophila TAF110 reveal properties expected of coactivators. Cell. 1993 Jan 29;72(2):247–260. doi: 10.1016/0092-8674(93)90664-c. [DOI] [PubMed] [Google Scholar]
  16. Hope I. A., Mahadevan S., Struhl K. Structural and functional characterization of the short acidic transcriptional activation region of yeast GCN4 protein. Nature. 1988 Jun 16;333(6174):635–640. doi: 10.1038/333635a0. [DOI] [PubMed] [Google Scholar]
  17. 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]
  18. 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]
  19. Ingles C. J., Shales M., Cress W. D., Triezenberg S. J., Greenblatt J. Reduced binding of TFIID to transcriptionally compromised mutants of VP16. Nature. 1991 Jun 13;351(6327):588–590. doi: 10.1038/351588a0. [DOI] [PubMed] [Google Scholar]
  20. Kim T. K., Hashimoto S., Kelleher R. J., 3rd, Flanagan P. M., Kornberg R. D., Horikoshi M., Roeder R. G. Effects of activation-defective TBP mutations on transcription initiation in yeast. Nature. 1994 May 19;369(6477):252–255. doi: 10.1038/369252a0. [DOI] [PubMed] [Google Scholar]
  21. Kim Y. J., Björklund S., Li Y., Sayre M. H., Kornberg R. D. A multiprotein mediator of transcriptional activation and its interaction with the C-terminal repeat domain of RNA polymerase II. Cell. 1994 May 20;77(4):599–608. doi: 10.1016/0092-8674(94)90221-6. [DOI] [PubMed] [Google Scholar]
  22. Kinney D. M., Lusty C. J. Arginine restriction induced by delta-N-(phosphonacetyl)-L-ornithine signals increased expression of HIS3, TRP5, CPA1, and CPA2 in Saccharomyces cerevisiae. Mol Cell Biol. 1989 Nov;9(11):4882–4888. doi: 10.1128/mcb.9.11.4882. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Kokubo T., Yamashita S., Horikoshi M., Roeder R. G., Nakatani Y. Interaction between the N-terminal domain of the 230-kDa subunit and the TATA box-binding subunit of TFIID negatively regulates TATA-box binding. Proc Natl Acad Sci U S A. 1994 Apr 26;91(9):3520–3524. doi: 10.1073/pnas.91.9.3520. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Koleske A. J., Young R. A. An RNA polymerase II holoenzyme responsive to activators. Nature. 1994 Mar 31;368(6470):466–469. doi: 10.1038/368466a0. [DOI] [PubMed] [Google Scholar]
  25. Laemmli U. K. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature. 1970 Aug 15;227(5259):680–685. doi: 10.1038/227680a0. [DOI] [PubMed] [Google Scholar]
  26. 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]
  27. Leuther K. K., Johnston S. A. Nondissociation of GAL4 and GAL80 in vivo after galactose induction. Science. 1992 May 29;256(5061):1333–1335. doi: 10.1126/science.1598579. [DOI] [PubMed] [Google Scholar]
  28. Leuther K. K., Salmeron J. M., Johnston S. A. Genetic evidence that an activation domain of GAL4 does not require acidity and may form a beta sheet. Cell. 1993 Feb 26;72(4):575–585. doi: 10.1016/0092-8674(93)90076-3. [DOI] [PubMed] [Google Scholar]
  29. Lillie J. W., Green M. R. Transcription activation by the adenovirus E1a protein. Nature. 1989 Mar 2;338(6210):39–44. doi: 10.1038/338039a0. [DOI] [PubMed] [Google Scholar]
  30. Lin J., Chen J., Elenbaas B., Levine A. J. Several hydrophobic amino acids in the p53 amino-terminal domain are required for transcriptional activation, binding to mdm-2 and the adenovirus 5 E1B 55-kD protein. Genes Dev. 1994 May 15;8(10):1235–1246. doi: 10.1101/gad.8.10.1235. [DOI] [PubMed] [Google Scholar]
  31. Lin Y. S., Green M. R. Mechanism of action of an acidic transcriptional activator in vitro. Cell. 1991 Mar 8;64(5):971–981. doi: 10.1016/0092-8674(91)90321-o. [DOI] [PubMed] [Google Scholar]
  32. Lin Y. S., Ha I., Maldonado E., Reinberg D., Green M. R. Binding of general transcription factor TFIIB to an acidic activating region. Nature. 1991 Oct 10;353(6344):569–571. doi: 10.1038/353569a0. [DOI] [PubMed] [Google Scholar]
  33. Ma J., Ptashne M. Deletion analysis of GAL4 defines two transcriptional activating segments. Cell. 1987 Mar 13;48(5):847–853. doi: 10.1016/0092-8674(87)90081-x. [DOI] [PubMed] [Google Scholar]
  34. Metz R., Bannister A. J., Sutherland J. A., Hagemeier C., O'Rourke E. C., Cook A., Bravo R., Kouzarides T. c-Fos-induced activation of a TATA-box-containing promoter involves direct contact with TATA-box-binding protein. Mol Cell Biol. 1994 Sep;14(9):6021–6029. doi: 10.1128/mcb.14.9.6021. [DOI] [PMC free article] [PubMed] [Google Scholar]
  35. Moehle C. M., Hinnebusch A. G. Association of RAP1 binding sites with stringent control of ribosomal protein gene transcription in Saccharomyces cerevisiae. Mol Cell Biol. 1991 May;11(5):2723–2735. doi: 10.1128/mcb.11.5.2723. [DOI] [PMC free article] [PubMed] [Google Scholar]
  36. Mueller P. P., Hinnebusch A. G. Multiple upstream AUG codons mediate translational control of GCN4. Cell. 1986 Apr 25;45(2):201–207. doi: 10.1016/0092-8674(86)90384-3. [DOI] [PubMed] [Google Scholar]
  37. Nasmyth K. A., Tatchell K. The structure of transposable yeast mating type loci. Cell. 1980 Mar;19(3):753–764. doi: 10.1016/s0092-8674(80)80051-1. [DOI] [PubMed] [Google Scholar]
  38. O'Shea E. K., Klemm J. D., Kim P. S., Alber T. X-ray structure of the GCN4 leucine zipper, a two-stranded, parallel coiled coil. Science. 1991 Oct 25;254(5031):539–544. doi: 10.1126/science.1948029. [DOI] [PubMed] [Google Scholar]
  39. Paluh J. L., Orbach M. J., Legerton T. L., Yanofsky C. The cross-pathway control gene of Neurospora crassa, cpc-1, encodes a protein similar to GCN4 of yeast and the DNA-binding domain of the oncogene v-jun-encoded protein. Proc Natl Acad Sci U S A. 1988 Jun;85(11):3728–3732. doi: 10.1073/pnas.85.11.3728. [DOI] [PMC free article] [PubMed] [Google Scholar]
  40. Pellman D., McLaughlin M. E., Fink G. R. TATA-dependent and TATA-independent transcription at the HIS4 gene of yeast. Nature. 1990 Nov 1;348(6296):82–85. doi: 10.1038/348082a0. [DOI] [PubMed] [Google Scholar]
  41. Ptashne M., Gann A. A. Activators and targets. Nature. 1990 Jul 26;346(6282):329–331. doi: 10.1038/346329a0. [DOI] [PubMed] [Google Scholar]
  42. Regier J. L., Shen F., Triezenberg S. J. Pattern of aromatic and hydrophobic amino acids critical for one of two subdomains of the VP16 transcriptional activator. Proc Natl Acad Sci U S A. 1993 Feb 1;90(3):883–887. doi: 10.1073/pnas.90.3.883. [DOI] [PMC free article] [PubMed] [Google Scholar]
  43. Roberts S. G., Ha I., Maldonado E., Reinberg D., Green M. R. Interaction between an acidic activator and transcription factor TFIIB is required for transcriptional activation. Nature. 1993 Jun 24;363(6431):741–744. doi: 10.1038/363741a0. [DOI] [PubMed] [Google Scholar]
  44. Seto E., Usheva A., Zambetti G. P., Momand J., Horikoshi N., Weinmann R., Levine A. J., Shenk T. Wild-type p53 binds to the TATA-binding protein and represses transcription. Proc Natl Acad Sci U S A. 1992 Dec 15;89(24):12028–12032. doi: 10.1073/pnas.89.24.12028. [DOI] [PMC free article] [PubMed] [Google Scholar]
  45. Shapira S. K., Chou J., Richaud F. V., Casadaban M. J. New versatile plasmid vectors for expression of hybrid proteins coded by a cloned gene fused to lacZ gene sequences encoding an enzymatically active carboxy-terminal portion of beta-galactosidase. Gene. 1983 Nov;25(1):71–82. doi: 10.1016/0378-1119(83)90169-5. [DOI] [PubMed] [Google Scholar]
  46. Sikorski R. S., Hieter P. A system of shuttle vectors and yeast host strains designed for efficient manipulation of DNA in Saccharomyces cerevisiae. Genetics. 1989 May;122(1):19–27. doi: 10.1093/genetics/122.1.19. [DOI] [PMC free article] [PubMed] [Google Scholar]
  47. Stringer K. F., Ingles C. J., Greenblatt J. Direct and selective binding of an acidic transcriptional activation domain to the TATA-box factor TFIID. Nature. 1990 Jun 28;345(6278):783–786. doi: 10.1038/345783a0. [DOI] [PubMed] [Google Scholar]
  48. Tjian R., Maniatis T. Transcriptional activation: a complex puzzle with few easy pieces. Cell. 1994 Apr 8;77(1):5–8. doi: 10.1016/0092-8674(94)90227-5. [DOI] [PubMed] [Google Scholar]
  49. Tzamarias D., Roussou I., Thireos G. Coupling of GCN4 mRNA translational activation with decreased rates of polypeptide chain initiation. Cell. 1989 Jun 16;57(6):947–954. doi: 10.1016/0092-8674(89)90333-4. [DOI] [PubMed] [Google Scholar]
  50. Van Hoy M., Leuther K. K., Kodadek T., Johnston S. A. The acidic activation domains of the GCN4 and GAL4 proteins are not alpha helical but form beta sheets. Cell. 1993 Feb 26;72(4):587–594. doi: 10.1016/0092-8674(93)90077-4. [DOI] [PubMed] [Google Scholar]
  51. Vazquez de Aldana C. R., Wek R. C., Segundo P. S., Truesdell A. G., Hinnebusch A. G. Multicopy tRNA genes functionally suppress mutations in yeast eIF-2 alpha kinase GCN2: evidence for separate pathways coupling GCN4 expression to unchanged tRNA. Mol Cell Biol. 1994 Dec;14(12):7920–7932. doi: 10.1128/mcb.14.12.7920. [DOI] [PMC free article] [PubMed] [Google Scholar]
  52. Wek R. C., Cannon J. F., Dever T. E., Hinnebusch A. G. Truncated protein phosphatase GLC7 restores translational activation of GCN4 expression in yeast mutants defective for the eIF-2 alpha kinase GCN2. Mol Cell Biol. 1992 Dec;12(12):5700–5710. doi: 10.1128/mcb.12.12.5700. [DOI] [PMC free article] [PubMed] [Google Scholar]
  53. Williams N. P., Mueller P. P., Hinnebusch A. G. The positive regulatory function of the 5'-proximal open reading frames in GCN4 mRNA can be mimicked by heterologous, short coding sequences. Mol Cell Biol. 1988 Sep;8(9):3827–3836. doi: 10.1128/mcb.8.9.3827. [DOI] [PMC free article] [PubMed] [Google Scholar]