title: Secondary structure of the ETS domain places murine Ets-1 in the superfamily of winged helix-turn-helix DNA-binding proteins.
abstract: The members of the ets gene family of transcription factors are characterized by a conserved 85-residue DNA-binding region, termed the ETS domain, that lacks sequence homology to structurally characterized DNA-binding motifs. The secondary structure of the ETS domain of murine Ets-1 was determined on the basis of NMR chemical shifts, NOE and J-coupling constraints, amide hydrogen exchange, circular dichroism, and FT-IR spectroscopy. The ETS domain is composed of three alpha-helices (H) and four beta-strands (S) arranged in the order H1-S1-S2-H2-H3-S3-S4. The four-stranded antiparallel beta-sheet is the scaffold for a putative helix-turn-helix DNA recognition motif formed by helices 2 and 3. The 25 residues extending beyond the ETS domain to the native C-terminus of the truncated Ets-1 also contain a helical segment. On the basis of the similarity of this topology with that of catabolite activator protein (CAP), heat shock factor (HSF), and hepatocyte nuclear factor (HNF-3 gamma), we propose that ets proteins are members of the superfamily of winged helix-turn-helix DNA-binding proteins.
authors.affiliation: Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, Canada.
authors.forename: L W
authors.initials: LW
authors.lastname: Donaldson
authors.forename: J M
authors.initials: JM
authors.lastname: Petersen
authors.forename: B J
authors.initials: BJ
authors.lastname: Graves
authors.forename: L P
authors.initials: LP
authors.lastname: McIntosh
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002942:Circular Dichroism; D003001:Cloning, Molecular; D004268:DNA-Binding Proteins / Q000737:chemistry*; D004926:Escherichia coli; D018257:Helix-Loop-Helix Motifs; D006859:Hydrogen / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D008969:Molecular Sequence Data; D017433:Protein Structure, Secondary; D050784:Proto-Oncogene Protein c-ets-1; D011518:Proto-Oncogene Proteins / Q000737:chemistry* / Q000235:genetics; D050783:Proto-Oncogene Proteins c-ets; D011994:Recombinant Proteins; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors
chemical_list: D004268:DNA-Binding Proteins; C494042:Ets1 protein, mouse; D050784:Proto-Oncogene Protein c-ets-1; D011518:Proto-Oncogene Proteins; D050783:Proto-Oncogene Proteins c-ets; D011994:Recombinant Proteins; D014157:Transcription Factors; D006859:Hydrogen