3GMJ

Crystal structure of MAD MH2 domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal structure of the MH2 domain of Drosophila Mad

Wang, C.Chen, L.Wang, L.Wu, J.W.

(2009) Sci China C Life Sci 52: 539-544

  • DOI: 10.1007/s11427-009-0080-x
  • Primary Citation of Related Structures:  
    3GMJ

  • PubMed Abstract: 
  • The decapentaplegic(Dpp), a member of the TGF-beta superfamily, plays a pivotal role in the control of proliferation, global patterning and induction of specific cell fates during Drosophila development. Mother against Dpp(Mad) is the founding member ...

    The decapentaplegic(Dpp), a member of the TGF-beta superfamily, plays a pivotal role in the control of proliferation, global patterning and induction of specific cell fates during Drosophila development. Mother against Dpp(Mad) is the founding member of the conserved Smad protein family which specifically transduces the intracellular TGF-beta signaling cascade. Here we report the 2.80 A structure of the MH2 domain of Mad(Mad-MH2) that was readily superposed to the mammal Smad-MH2 structures. This unphosphorylated Mad-MH2 forms a symmetric homotrimer in crystals, consistent with the result of the size-exclusion chromatography that Mad-MH2 exhibited a propensity for concentration-dependent oligomerization prior to phosphorylation. Structural analysis revealed that the formation of homotrimeric Mad-MH2 is mainly mediated by contacts involving the extreme C-terminal SSVS motif, and is strengthened by phosphorylation of the last two Ser residues which was confirmed by the gel filtration analysis of the pseudophosphorylated Mad-MH2(DVD). Intriguingly, the homotrimer within an asymmetric unit only possesses two ordered C-terminal tails, reminiscent of the arrangement of the R-Smad/Smad4 complexes, indicating that the subunit with a flexible SSXS motif would be readily replaced by Co-Smad to form a functional heterotrimer.


    Organizational Affiliation

    MOE Key Laboratory of Bioinformatics, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein mothers against dppABCD245Drosophila melanogasterMutation(s): 0 
Gene Names: MadCG12399
Find proteins for P42003 (Drosophila melanogaster)
Explore P42003 
Go to UniProtKB:  P42003
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 137.261α = 90
b = 137.261β = 90
c = 194.43γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2009-03-14 
  • Released Date: 2009-12-15 
  • Deposition Author(s): Wu, J.W., Wang, C.

Revision History 

  • Version 1.0: 2009-12-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance