4X0G

Structure of Bsg25A binding with DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.21 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Common and distinct DNA-binding and regulatory activities of the BEN-solo transcription factor family.

Dai, Q.Ren, A.Westholm, J.O.Duan, H.Patel, D.J.Lai, E.C.

(2015) Genes Dev 29: 48-62

  • DOI: 10.1101/gad.252122.114
  • Primary Citation of Related Structures:  
    4X0G

  • PubMed Abstract: 
  • Recently, the BEN (BANP, E5R, and NAC1) domain was recognized as a new class of conserved DNA-binding domain. The fly genome encodes three proteins that bear only a single BEN domain ("BEN-solo" factors); namely, Insensitive (Insv), Bsg25A (Elba1), and CG9883 (Elba2) ...

    Recently, the BEN (BANP, E5R, and NAC1) domain was recognized as a new class of conserved DNA-binding domain. The fly genome encodes three proteins that bear only a single BEN domain ("BEN-solo" factors); namely, Insensitive (Insv), Bsg25A (Elba1), and CG9883 (Elba2). Insv homodimers preferentially bind CCAATTGG palindromes throughout the genome to mediate transcriptional repression, whereas Bsg25A and Elba2 heterotrimerize with their obligate adaptor, Elba3 (i.e., the ELBA complex), to recognize a CCAATAAG motif in the Fab-7 insulator. While these data suggest distinct DNA-binding properties of BEN-solo proteins, we performed reporter assays that indicate that both Bsg25A and Elba2 can individually recognize Insv consensus sites efficiently. We confirmed this by solving the structure of Bsg25A complexed to the Insv site, which showed that key aspects of the BEN:DNA recognition strategy are similar between these proteins. We next show that both Insv and ELBA proteins are competent to mediate transcriptional repression via Insv consensus sequences but that the ELBA complex appears to be selective for the ELBA site. Reciprocally, genome-wide analysis reveals that Insv exhibits significant cobinding to class I insulator elements, indicating that it may also contribute to insulator function. Indeed, we observed abundant Insv binding within the Hox complexes with substantial overlaps with class I insulators, many of which bear Insv consensus sites. Moreover, Insv coimmunoprecipitates with the class I insulator factor CP190. Finally, we observed that Insv harbors exclusive activity among fly BEN-solo factors with respect to regulation of Notch-mediated cell fate choices in the peripheral nervous system. This in vivo activity is recapitulated by BEND6, a mammalian BEN-solo factor that conserves the Notch corepressor function of Insv but not its capacity to bind Insv consensus sites. Altogether, our data define an array of common and distinct biochemical and functional properties of this new family of transcription factors.


    Organizational Affiliation

    Department of Developmental Biology, laie@mskcc.org.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Blastoderm-specific gene 25AA, B, C, D109Drosophila melanogasterMutation(s): 0 
Gene Names: Bsg25ACG12205Dmel_CG12205Elba1
UniProt
Find proteins for Q9VR17 (Drosophila melanogaster)
Explore Q9VR17 
Go to UniProtKB:  Q9VR17
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*GP*TP*TP*CP*CP*AP*AP*TP*TP*GP*GP*AP*A)-3')E, F, G, H13Drosophila melanogaster
    Protein Feature View
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    • Reference Sequence
    Small Molecules
    Ligands 1 Unique
    IDChainsName / Formula / InChI Key2D Diagram3D Interactions
    ACT
    Query on ACT

    Download Ideal Coordinates CCD File 
    I [auth A], J [auth A], K [auth D]ACETATE ION
    C2 H3 O2
    QTBSBXVTEAMEQO-UHFFFAOYSA-M
     Ligand Interaction
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 3.21 Å
    • R-Value Free: 0.277 
    • R-Value Work: 0.228 
    • R-Value Observed: 0.231 
    • Space Group: P 31
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 92.55α = 90
    b = 92.55β = 90
    c = 62.998γ = 120
    Software Package:
    Software NamePurpose
    SCALEPACKdata scaling
    PHASERphasing
    PHENIXrefinement
    PDB_EXTRACTdata extraction

    Structure Validation

    View Full Validation Report




    Entry History 

    Deposition Data

    • Deposited Date: 2014-11-21 
    • Released Date: 2015-01-21 
    • Deposition Author(s): Ren, A.

    Revision History  (Full details and data files)

    • Version 1.0: 2015-01-21
      Type: Initial release