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 

wwPDB Validation 3D Report Full Report


This is version 1.1 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: 10.1016/j.jmb.2007.04.002

  • 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, ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DISHEVELED-ASSOCIATED ACTIVATOR OF MORPHOGENESIS 1
G
483Homo sapiensMutation(s): 0 
Gene Names: DAAM1 (KIAA0666)
Find proteins for Q9Y4D1 (Homo sapiens)
Go to Gene View: DAAM1
Go to UniProtKB:  Q9Y4D1
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
G
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
G
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.218 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 100.897α = 90.00
b = 100.343β = 90.00
c = 148.397γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-05-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance