3EG5

Crystal structure of MDIA1-TSH GBD-FH3 in complex with CDC42-GMPPNP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Specificity of Interactions between mDia Isoforms and Rho Proteins

Lammers, M.Meyer, S.Kuhlmann, D.Wittinghofer, A.

(2008) J.Biol.Chem. 283: 35236-35246

  • DOI: 10.1074/jbc.M805634200

  • PubMed Abstract: 
  • Formins are key regulators of actin nucleation and polymerization. They contain formin homology 1 (FH1) and 2 (FH2) domains as the catalytic machinery for the formation of linear actin cables. A subclass of formins constitutes the Diaphanous-related ...

    Formins are key regulators of actin nucleation and polymerization. They contain formin homology 1 (FH1) and 2 (FH2) domains as the catalytic machinery for the formation of linear actin cables. A subclass of formins constitutes the Diaphanous-related formins, members of which are regulated by the binding of a small GTP-binding protein of the Rho subfamily. Binding of these molecular switch proteins to the regulatory N-terminal mDia(N), including the GTPase-binding domain, leads to the release of auto-inhibition. From the three mDia isoforms, mDia1 is activated only by Rho (RhoA, -B, and -C), in contrast to mDia2 and -3, which is also activated by Rac and Cdc42. Little is known about the determinants of specificity. Here we report on the interactions of RhoA, Rac1, and Cdc42 with mDia1 and an mDia1 mutant (mDia(N)-Thr-Ser-His (TSH)), which based on structural information should mimic mDia2 and -3. Specificity is analyzed by biochemical studies and a structural analysis of a complex between Cdc42.Gpp(NH)p and mDia(N)-TSH. A triple NNN motif in mDia1 (amino acids 164-166), corresponding to the TSH motif in mDia2/3 (amino acids 183-185 and 190-192), and the epitope interacting with the Rho insert helix are essential for high affinity binding. The triple N motif of mDia1 allows tight interaction with Rho because of the presence of Phe-106, whereas the corresponding His-104 in Rac and Cdc42 forms a complementary interface with the TSH motif in mDia2/3. We also show that the F106H and H104F mutations drastically alter the affinities and thermodynamics of mDia interactions.


    Organizational Affiliation

    Max-Planck-Institute for Molecular Physiology, Department of Structural Biology, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cell division control protein 42 homolog
A, C
178Mus musculusMutation(s): 0 
Gene Names: Cdc42
Find proteins for P60766 (Mus musculus)
Go to UniProtKB:  P60766
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein diaphanous homolog 1
B, D
383Mus musculusMutation(s): 3 
Gene Names: Diaph1 (Diap1)
Find proteins for O08808 (Mus musculus)
Go to UniProtKB:  O08808
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, C
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
GNP
Query on GNP

Download SDF File 
Download CCD File 
A, C
PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER
C10 H17 N6 O13 P3
UQABYHGXWYXDTK-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 
  • Space Group: P 32
Unit Cell:
Length (Å)Angle (°)
a = 71.269α = 90.00
b = 71.269β = 90.00
c = 244.964γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata scaling
MOLREPphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-10-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance