2J1D

Crystallization of hDaam1 C-terminal Fragment


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of the Fh2 Domain of Daam1: Implications for Formin Regulation of Actin Assembly.

Lu, J.Meng, W.Poy, F.Maiti, S.Goode, B.L.Eck, M.J.

(2007) J Mol Biol 369: 1258

  • DOI: https://doi.org/10.1016/j.jmb.2007.04.002
  • Primary Citation of Related Structures:  
    2J1D

  • PubMed Abstract: 

    Daam1 (dishevelled-associated activator of morphogenesis-1) is a diaphanous-related formin first studied as a novel dishevelled binding protein and shown to be crucial for the planar cell polarity (PCP) pathway in Xenopus. Daam1, like other formins, directs nucleation and elongation of new actin filaments using its conserved formin-homology-2 (FH2) domain. Here we report the crystal structure of a large C-terminal fragment of human Daam1 containing the FH2 domain. The structure, determined at 2.25 A resolution using the single-wavelength anomalous diffraction (SAD) phasing method, reveals a "tethered dimer" architecture that is similar to that previously described for the FH2 domain of the yeast formin Bni1, which shares approximately 21% sequence identity with Daam1. Despite the overall similarity with the dimeric FH2 domain of Bni1 and with a truncated monomeric structure of mDia1, the Daam1 FH2 structure reveals a number of differences in secondary structure elements and in the "lasso/post" dimerization interface that may be functionally important. Most strikingly, the two halves of the crystallographic dimer pack together in a manner that occludes their actin binding surfaces. This "locked" conformation is stabilized by two novel, interacting beta-strands formed by the ends of the linkers that connect the two sides of the dimer. The Daam1 FH2 domain has weak actin assembly activity as compared with other mammalian formins, but mutations that disrupt the beta-strand lock increase activity about tenfold to a level comparable to other formins, suggesting that this occluded conformation may represent an auto-inhibited conformation of the Daam1 FH2 domain.


  • Organizational Affiliation

    Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School and Department of Cancer Biology, Dana-Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DISHEVELED-ASSOCIATED ACTIVATOR OF MORPHOGENESIS 1A [auth G]483Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y4D1 (Homo sapiens)
Explore Q9Y4D1 
Go to UniProtKB:  Q9Y4D1
PHAROS:  Q9Y4D1
GTEx:  ENSG00000100592 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9Y4D1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.897α = 90
b = 100.343β = 90
c = 148.397γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-05-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2024-05-08
    Changes: Data collection, Database references, Other