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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1994 Jul 19;91(15):7360–7364. doi: 10.1073/pnas.91.15.7360

Energy transfer analysis of Fos-Jun dimerization and DNA binding.

L R Patel 1, T Curran 1, T K Kerppola 1
PMCID: PMC44399  PMID: 8041795

Abstract

The protooncogenes fos and jun encode proteins that bind to DNA as dimeric complexes and regulate gene expression. Protein dimerization is mediated by a leucine zipper and results in juxtaposition of regions of each protein rich in basic amino acids that comprise a bimolecular DNA binding domain. We have developed an approach based on resonance energy transfer for the quantitative analysis of dimerization and DNA binding by Fos and Jun in solution. Fos-(118-211) and Jun-(225-334) polypeptides were labeled with either 5-iodoacetamidofluorescein or rhodamine X iodoacetamide on unique cysteine residues located in their DNA binding domains. Formation of heterodimeric complexes between the labeled proteins allowed resonance energy transfer between the donor fluorescein and the acceptor rhodamine fluorophores. DNA binding induced a conformational transition that increased the efficiency of resonance energy transfer. This increase was consistent with a 3-A reduction in the distance between the fluorophores. Using this assay, we determined the affinity of the Fos-Jun interaction and examined the kinetics of dimerization and DNA binding as well as the rate of subunit exchange. Dimerization and DNA binding by Fos and Jun were rapid, with half-times of < 10 s. In the absence of DNA, Fos and Jun subunits exchanged rapidly, with a half-time of < 10 s. In contrast, in the presence of DNA, the complex was extremely stable. Thus, leucine zipper-containing transcription factors may exchange subunits readily when free in solution, but not when bound to DNA.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Abate C., Luk D., Curran T. A ubiquitous nuclear protein stimulates the DNA-binding activity of fos and jun indirectly. Cell Growth Differ. 1990 Oct;1(10):455–462. [PubMed] [Google Scholar]
  2. Abate C., Luk D., Gentz R., Rauscher F. J., 3rd, Curran T. Expression and purification of the leucine zipper and DNA-binding domains of Fos and Jun: both Fos and Jun contact DNA directly. Proc Natl Acad Sci U S A. 1990 Feb;87(3):1032–1036. doi: 10.1073/pnas.87.3.1032. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Abate C., Patel L., Rauscher F. J., 3rd, Curran T. Redox regulation of fos and jun DNA-binding activity in vitro. Science. 1990 Sep 7;249(4973):1157–1161. doi: 10.1126/science.2118682. [DOI] [PubMed] [Google Scholar]
  4. Adams S. R., Harootunian A. T., Buechler Y. J., Taylor S. S., Tsien R. Y. Fluorescence ratio imaging of cyclic AMP in single cells. Nature. 1991 Feb 21;349(6311):694–697. doi: 10.1038/349694a0. [DOI] [PubMed] [Google Scholar]
  5. Cohen D. R., Curran T. Analysis of dimerization and DNA binding functions in Fos and Jun by domain-swapping: involvement of residues outside the leucine zipper/basic region. Oncogene. 1990 Jun;5(6):929–939. [PubMed] [Google Scholar]
  6. Curran T., Franza B. R., Jr Fos and Jun: the AP-1 connection. Cell. 1988 Nov 4;55(3):395–397. doi: 10.1016/0092-8674(88)90024-4. [DOI] [PubMed] [Google Scholar]
  7. Curran T., Teich N. M. Candidate product of the FBJ murine osteosarcoma virus oncogene: characterization of a 55,000-dalton phosphoprotein. J Virol. 1982 Apr;42(1):114–122. doi: 10.1128/jvi.42.1.114-122.1982. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. 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]
  9. Gentz R., Rauscher F. J., 3rd, Abate C., Curran T. Parallel association of Fos and Jun leucine zippers juxtaposes DNA binding domains. Science. 1989 Mar 31;243(4899):1695–1699. doi: 10.1126/science.2494702. [DOI] [PubMed] [Google Scholar]
  10. Griep M. A., McHenry C. S. Fluorescence energy transfer between the primer and the beta subunit of the DNA polymerase III holoenzyme. J Biol Chem. 1992 Feb 15;267(5):3052–3059. [PubMed] [Google Scholar]
  11. Hai T., Curran T. Cross-family dimerization of transcription factors Fos/Jun and ATF/CREB alters DNA binding specificity. Proc Natl Acad Sci U S A. 1991 May 1;88(9):3720–3724. doi: 10.1073/pnas.88.9.3720. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Harrison S. C. A structural taxonomy of DNA-binding domains. Nature. 1991 Oct 24;353(6346):715–719. doi: 10.1038/353715a0. [DOI] [PubMed] [Google Scholar]
  13. Hoeffler J. P., Lustbader J. W., Chen C. Y. Identification of multiple nuclear factors that interact with cyclic adenosine 3',5'-monophosphate response element-binding protein and activating transcription factor-2 by protein-protein interactions. Mol Endocrinol. 1991 Feb;5(2):256–266. doi: 10.1210/mend-5-2-256. [DOI] [PubMed] [Google Scholar]
  14. Jain J., McCaffrey P. G., Miner Z., Kerppola T. K., Lambert J. N., Verdine G. L., Curran T., Rao A. The T-cell transcription factor NFATp is a substrate for calcineurin and interacts with Fos and Jun. Nature. 1993 Sep 23;365(6444):352–355. doi: 10.1038/365352a0. [DOI] [PubMed] [Google Scholar]
  15. Kerppola T. K., Curran T. DNA bending by Fos and Jun: the flexible hinge model. Science. 1991 Nov 22;254(5035):1210–1214. doi: 10.1126/science.1957173. [DOI] [PubMed] [Google Scholar]
  16. Kerppola T. K., Curran T. Fos-Jun heterodimers and Jun homodimers bend DNA in opposite orientations: implications for transcription factor cooperativity. Cell. 1991 Jul 26;66(2):317–326. doi: 10.1016/0092-8674(91)90621-5. [DOI] [PubMed] [Google Scholar]
  17. Kerppola T. K., Curran T. Maf and Nrl can bind to AP-1 sites and form heterodimers with Fos and Jun. Oncogene. 1994 Mar;9(3):675–684. [PubMed] [Google Scholar]
  18. Kerppola T. K., Curran T. Selective DNA bending by a variety of bZIP proteins. Mol Cell Biol. 1993 Sep;13(9):5479–5489. doi: 10.1128/mcb.13.9.5479. [DOI] [PMC free article] [PubMed] [Google Scholar]
  19. Kerppola T. K., Luk D., Curran T. Fos is a preferential target of glucocorticoid receptor inhibition of AP-1 activity in vitro. Mol Cell Biol. 1993 Jun;13(6):3782–3791. doi: 10.1128/mcb.13.6.3782. [DOI] [PMC free article] [PubMed] [Google Scholar]
  20. König P., Richmond T. J. The X-ray structure of the GCN4-bZIP bound to ATF/CREB site DNA shows the complex depends on DNA flexibility. J Mol Biol. 1993 Sep 5;233(1):139–154. doi: 10.1006/jmbi.1993.1490. [DOI] [PubMed] [Google Scholar]
  21. 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]
  22. Macgregor P. F., Abate C., Curran T. Direct cloning of leucine zipper proteins: Jun binds cooperatively to the CRE with CRE-BP1. Oncogene. 1990 Apr;5(4):451–458. [PubMed] [Google Scholar]
  23. Maki Y., Bos T. J., Davis C., Starbuck M., Vogt P. K. Avian sarcoma virus 17 carries the jun oncogene. Proc Natl Acad Sci U S A. 1987 May;84(9):2848–2852. doi: 10.1073/pnas.84.9.2848. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. McCaffrey P. G., Luo C., Kerppola T. K., Jain J., Badalian T. M., Ho A. M., Burgeon E., Lane W. S., Lambert J. N., Curran T. Isolation of the cyclosporin-sensitive T cell transcription factor NFATp. Science. 1993 Oct 29;262(5134):750–754. doi: 10.1126/science.8235597. [DOI] [PubMed] [Google Scholar]
  25. 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]
  26. O'Shea E. K., Rutkowski R., Kim P. S. Mechanism of specificity in the Fos-Jun oncoprotein heterodimer. Cell. 1992 Feb 21;68(4):699–708. doi: 10.1016/0092-8674(92)90145-3. [DOI] [PubMed] [Google Scholar]
  27. O'Shea E. K., Rutkowski R., Stafford W. F., 3rd, Kim P. S. Preferential heterodimer formation by isolated leucine zippers from fos and jun. Science. 1989 Aug 11;245(4918):646–648. doi: 10.1126/science.2503872. [DOI] [PubMed] [Google Scholar]
  28. 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]
  29. Pernelle C., Clerc F. F., Dureuil C., Bracco L., Tocque B. An efficient screening assay for the rapid and precise determination of affinities between leucine zipper domains. Biochemistry. 1993 Nov 2;32(43):11682–11687. doi: 10.1021/bi00094a026. [DOI] [PubMed] [Google Scholar]
  30. Turner R., Tjian R. Leucine repeats and an adjacent DNA binding domain mediate the formation of functional cFos-cJun heterodimers. Science. 1989 Mar 31;243(4899):1689–1694. doi: 10.1126/science.2494701. [DOI] [PubMed] [Google Scholar]
  31. 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]

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