1B8I

STRUCTURE OF THE HOMEOTIC UBX/EXD/DNA TERNARY COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.224 

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This is version 1.3 of the entry. See complete history


Literature

Structure of a DNA-bound Ultrabithorax-Extradenticle homeodomain complex.

Passner, J.M.Ryoo, H.D.Shen, L.Mann, R.S.Aggarwal, A.K.

(1999) Nature 397: 714-719

  • DOI: 10.1038/17833
  • Primary Citation of Related Structures:  
    1B8I

  • PubMed Abstract: 
  • During the development of multicellular organisms, gene expression must be tightly regulated, both spatially and temporally. One set of transcription factors that are important in animal development is encoded by the homeotic (Hox) genes, which govern the choice between alternative developmental pathways along the anterior-posterior axis ...

    During the development of multicellular organisms, gene expression must be tightly regulated, both spatially and temporally. One set of transcription factors that are important in animal development is encoded by the homeotic (Hox) genes, which govern the choice between alternative developmental pathways along the anterior-posterior axis. Hox proteins, such as Drosophila Ultrabithorax, have low DNA-binding specificity by themselves but gain affinity and specificity when they bind together with the homeoprotein Extradenticle (or Pbxl in mammals). To understand the structural basis of Hox-Extradenticle pairing, we determine here the crystal structure of an Ultrabithorax-Extradenticle-DNA complex at 2.4 A resolution, using the minimal polypeptides that form a cooperative heterodimer. The Ultrabithorax and Extradenticle homeodomains bind opposite faces of the DNA, with their DNA-recognition helices almost touching each other. However, most of the cooperative interactions arise from the YPWM amino-acid motif of Ultrabithorax-located amino-terminally to its homeodomain-which forms a reverse turn and inserts into a hydrophobic pocket on the Extradenticle homeodomain surface. Together, these protein-DNA and protein-protein interactions define the general principles by which homeotic proteins interact with Extradenticle (or Pbx1) to affect development along the anterior-posterior axis of animals.


    Organizational Affiliation

    Structural Biology Program, Department of Physiology and Biophysics, Mount Sinai School of Medicine, New York, New York 10029, USA.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (ULTRABITHORAX HOMEOTIC PROTEIN IV)C [auth A]81Drosophila melanogasterMutation(s): 1 
Gene Names: UbxCG10388
UniProt
Find proteins for P83949 (Drosophila melanogaster)
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Go to UniProtKB:  P83949
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UniProt GroupP83949
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (HOMEOBOX PROTEIN EXTRADENTICLE)D [auth B]63Drosophila melanogasterMutation(s): 0 
Gene Names: exdCG8933
UniProt
Find proteins for P40427 (Drosophila melanogaster)
Explore P40427 
Go to UniProtKB:  P40427
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UniProt GroupP40427
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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (5'-D(*GP*TP*CP*GP*CP*CP*AP*TP*AP*AP*AP*TP*CP*AP*C)-3')A [auth C]15N/A
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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*AP*CP*GP*TP*GP*AP*TP*TP*TP*AP*TP*GP*GP*CP*G)-3')B [auth D]15N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.224 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.43α = 90
b = 69.43β = 90
c = 100.7γ = 90
Software Package:
Software NamePurpose
MLPHAREphasing
SHARPphasing
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-04-12
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references