3OBV

Autoinhibited Formin mDia1 Structure


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Crystal structure of the Formin mDia1 in autoinhibited conformation.

Otomo, T.Tomchick, D.R.Otomo, C.Machius, M.Rosen, M.K.

(2010) PLoS One 5: e12896-e12896

  • DOI: https://doi.org/10.1371/journal.pone.0012896
  • Primary Citation of Related Structures:  
    3OBV

  • PubMed Abstract: 

    Formin proteins utilize a conserved formin homology 2 (FH2) domain to nucleate new actin filaments. In mammalian diaphanous-related formins (DRFs) the FH2 domain is inhibited through an unknown mechanism by intramolecular binding of the diaphanous autoinhibitory domain (DAD) and the diaphanous inhibitory domain (DID). Here we report the crystal structure of a complex between DID and FH2-DAD fragments of the mammalian DRF, mDia1 (mammalian diaphanous 1 also called Drf1 or p140mDia). The structure shows a tetrameric configuration (4 FH2 + 4 DID) in which the actin-binding sites on the FH2 domain are sterically occluded. However biochemical data suggest the full-length mDia1 is a dimer in solution (2 FH2 + 2 DID). Based on the crystal structure, we have generated possible dimer models and found that architectures of all of these models are incompatible with binding to actin filament but not to actin monomer. Furthermore, we show that the minimal functional monomeric unit in the FH2 domain, termed the bridge element, can be inhibited by isolated monomeric DID. NMR data on the bridge-DID system revealed that at least one of the two actin-binding sites on the bridge element is accessible to actin monomer in the inhibited state. Our findings suggest that autoinhibition in the native DRF dimer involves steric hindrance with the actin filament. Although the structure of a full-length DRF would be required for clarification of the presented models, our work here provides the first structural insights into the mechanism of the DRF autoinhibition.


  • Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas, Texas, United States of America.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein diaphanous homolog 1A,
C [auth B],
E [auth C],
G [auth D]
327Mus musculusMutation(s): 0 
Gene Names: Diaph1Diap1
UniProt & NIH Common Fund Data Resources
Find proteins for O08808 (Mus musculus)
Explore O08808 
Go to UniProtKB:  O08808
IMPC:  MGI:1194490
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO08808
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Protein diaphanous homolog 1B [auth E],
D [auth F],
F [auth G],
H
457Mus musculusMutation(s): 0 
Gene Names: Diaph1Diap1
UniProt & NIH Common Fund Data Resources
Find proteins for O08808 (Mus musculus)
Explore O08808 
Go to UniProtKB:  O08808
IMPC:  MGI:1194490
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO08808
Sequence Annotations
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-fructofuranose-(2-1)-alpha-D-glucopyranose
I, J, K, L, M
I, J, K, L, M, N, O, P
2N/A
Glycosylation Resources
GlyTouCan:  G05551OP
GlyCosmos:  G05551OP
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.926α = 90
b = 208.519β = 102.74
c = 131.516γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
AMoREphasing
MLPHAREphasing
DMphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
DENZOdata reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-04-25
    Changes: Database references
  • Version 1.3: 2017-11-08
    Changes: Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2024-02-21
    Changes: Data collection, Database references, Refinement description, Structure summary