title: Structural basis of Ets1 cooperative binding to palindromic sequences on stromelysin-1 promoter DNA.
abstract: Ets1 is a member of the Ets family of transcription factors. Ets1 is autoinhibited and its activation requires heterodimerization with a partner protein or DNA-mediated homodimerization for cooperative DNA binding. In the latter case, Ets1 molecules bind to palindromic sequences in which two Ets-binding sites (EBS) are separated by four base pairs, for example in the promoters of stromelysin-1 and p53. Interestingly, counteraction of autoinhibition requires the autoinhibitory region encoded by exon VII of the gene. The structural basis for the requirement of autoinhibitory sequences for Ets1 binding to palindromic EBS still remains unresolved. Here we report the crystal structure of two Ets1 molecules bound to an EBS palindrome of the stromelysin-1 promoter DNA, providing a plausible explanation for the requirement of exon VII-encoded sequences for Ets1 cooperative DNA binding. The proposed mechanism was verified both in vitro by surface plasmon resonance and in vivo by transcription-based assays.
authors.affiliation: Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Nebraska Medical Center, Omaha, NE, USA.
authors.forename: Nigar D
authors.initials: ND
authors.lastname: Babayeva
authors.forename: Phillip J
authors.initials: PJ
authors.lastname: Wilder
authors.forename: Masaaki
authors.initials: M
authors.lastname: Shiina
authors.forename: Koshiki
authors.initials: K
authors.lastname: Mino
authors.forename: Michelle
authors.initials: M
authors.lastname: Desler
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Ogata
authors.forename: Angie
authors.initials: A
authors.lastname: Rizzino
authors.forename: Tahir H
authors.initials: TH
authors.lastname: Tahirov
mesh_terms: D000595:Amino Acid Sequence; D002460:Cell Line; D018360:Crystallography, X-Ray; D004247:DNA / Q000378:metabolism*; D006801:Humans; D055029:Inverted Repeat Sequences / Q000235:genetics*; D007700:Kinetics; D019278:Matrix Metalloproteinase 3 / Q000235:genetics*; D008954:Models, Biological; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D050784:Proto-Oncogene Protein c-ets-1 / Q000737:chemistry* / Q000378:metabolism*; D013329:Structure-Activity Relationship
chemical_list: D050784:Proto-Oncogene Protein c-ets-1; D004247:DNA; D019278:Matrix Metalloproteinase 3