3O4X

Crystal structure of complex between amino and carboxy terminal fragments of mDia1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.233 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Crystal structure of a complex between amino and carboxy terminal fragments of mDia1: insights into autoinhibition of diaphanous-related formins.

Nezami, A.Poy, F.Toms, A.Zheng, W.Eck, M.J.

(2010) Plos One 5: e12992-e12992

  • DOI: 10.1371/journal.pone.0012992

  • PubMed Abstract: 
  • Formin proteins direct the nucleation and assembly of linear actin filaments in a variety of cellular processes using their conserved formin homology 2 (FH2) domain. Diaphanous-related formins (DRFs) are effectors of Rho-family GTPases, and in the ab ...

    Formin proteins direct the nucleation and assembly of linear actin filaments in a variety of cellular processes using their conserved formin homology 2 (FH2) domain. Diaphanous-related formins (DRFs) are effectors of Rho-family GTPases, and in the absence of Rho activation they are maintained in an inactive state by intramolecular interactions between their regulatory N-terminal region and a C-terminal segment referred to as the DAD domain. Although structures are available for the isolated DAD segment in complex with the interacting region in the N-terminus, it remains unclear how this leads to inhibition of actin assembly by the FH2 domain. Here we describe the crystal structure of the N-terminal regulatory region of formin mDia1 in complex with a C-terminal fragment containing both the FH2 and DAD domains. In the crystal structure and in solution, these fragments form a tetrameric complex composed of two interlocking N+C dimers. Formation of the tetramer is likely a consequence of the particular N-terminal construct employed, as we show that a nearly full-length mDia1 protein is dimeric, as are other autoinhibited N+C complexes containing longer N-terminal fragments. The structure provides the first view of the intact C-terminus of a DRF, revealing the relationship of the DAD to the FH2 domain. Delineation of alternative dimeric N+C interactions within the tetramer provides two general models for autoinhibition in intact formins. In both models, engagement of the DAD by the N-terminus is incompatible with actin filament formation on the FH2, and in one model the actin binding surfaces of the FH2 domain are directly blocked by the N-terminus.


    Organizational Affiliation

    Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein diaphanous homolog 1
A, B, C, D
330Mus musculusMutation(s): 0 
Gene Names: Diaph1 (Diap1)
Find proteins for O08808 (Mus musculus)
Go to UniProtKB:  O08808
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein diaphanous homolog 1
E, H, G, F
467Mus musculusMutation(s): 0 
Gene Names: Diaph1 (Diap1)
Find proteins for O08808 (Mus musculus)
Go to UniProtKB:  O08808
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.233 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 95.762α = 90.00
b = 206.832β = 105.94
c = 131.065γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
PHASERphasing
XDSdata reduction
ADSCdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-10-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-08-17
    Type: Database references
  • Version 1.3: 2011-10-05
    Type: Database references
  • Version 1.4: 2012-04-11
    Type: Database references