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Beads-on-a-string, characterization of ETS-1 sumoylated within its flexible N-terminal sequence

  • Author(s) / Creator(s)
  • Sumoylation regulates the activities of several members of the ETS transcription factor family. To provide a molecular framework for understanding this regulation, we have characterized the conjugation of Ets-1 with SUMO-1. Ets-1 is modified in vivo predominantly at a consensus sumoylation motif containing Lys-15. This lysine is located within the unstructured N-terminal segment of Ets-1 preceding its PNT domain. Using NMR spectroscopy, we demonstrate that the Ets-1 sumoylation motif associates with the substrate binding site on the SUMO-conjugating enzyme UBC9 (Kd ∼400 μm) and that the PNT domain is not involved in this interaction. Ets-1 with Lys-15 mutated to an arginine still binds UBC9 with an affinity similar to the wild type protein, but is no longer sumoylated. NMR chemical shift and relaxation measurements reveal that the covalent attachment of mature SUMO-1, via its flexible C-terminal Gly-97, to Lys-15 of Ets-1 does not perturb the structure or dynamic properties of either protein. Therefore sumoylated Ets-1 behaves as “beads-on-a-string” with the two proteins tethered by flexible polypeptide segments containing the isopeptide linkage. Accordingly, SUMO-1 may mediate interactions of Ets-1 with signaling or transcriptional regulatory macromolecules by acting as a structurally independent docking module, rather than through the induction of a conformational change in either protein upon their covalent linkage. We also hypothesize that the flexibility of the linking polypeptide sequence may be a general feature contributing to the recognition of SUMO-modified proteins by their downstream effectors.

  • Date created
    2006
  • Subjects / Keywords
  • Type of Item
    Article (Published)
  • DOI
    https://doi.org/10.7939/R3TD9NP4M
  • License
    © 2006 Matthew S. Macauley et al. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
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  • Citation for previous publication
    • Macauley, Matthew S., Errington, Wesley J., Schärpf, Manuela, Mackereth, Cameron D., Blaszczak, Adam G., Graves, Barbara J., & McIntosh, Lawrence P. (2006). Beads-on-a-string, characterization of ETS-1 sumoylated within its flexible N-terminal sequence. Journal of Biological Chemistry, 281(7), 4164-4172. http://doi.org/10.1074/jbc.M510488200
  • Link to related item
    http://doi.org/10.1074/jbc.M510488200