1T44

Structural basis of actin sequestration by thymosin-B4: Implications for arp2/3 activation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.144 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis of actin sequestration by thymosin-beta4: implications for WH2 proteins.

Irobi, E.Aguda, A.H.Larsson, M.Guerin, C.Yin, H.L.Burtnick, L.D.Blanchoin, L.Robinson, R.C.

(2004) Embo J. 23: 3599-3608

  • DOI: 10.1038/sj.emboj.7600372

  • PubMed Abstract: 
  • The WH2 (Wiscott-Aldridge syndrome protein homology domain 2) repeat is an actin interacting motif found in monomer sequestering and filament assembly proteins. We have stabilized the prototypical WH2 family member, thymosin-beta4 (Tbeta4), with resp ...

    The WH2 (Wiscott-Aldridge syndrome protein homology domain 2) repeat is an actin interacting motif found in monomer sequestering and filament assembly proteins. We have stabilized the prototypical WH2 family member, thymosin-beta4 (Tbeta4), with respect to actin, by creating a hybrid between gelsolin domain 1 and the C-terminal half of Tbeta4 (G1-Tbeta4). This hybrid protein sequesters actin monomers, severs actin filaments and acts as a leaky barbed end cap. Here, we present the structure of the G1-Tbeta4:actin complex at 2 A resolution. The structure reveals that Tbeta4 sequesters by capping both ends of the actin monomer, and that exchange of actin between Tbeta4 and profilin is mediated by a minor overlap in binding sites. The structure implies that multiple WH2 motif-containing proteins will associate longitudinally with actin filaments. Finally, we discuss the role of the WH2 motif in arp2/3 activation.


    Organizational Affiliation

    Department of Medical Biochemistry and Microbiology, Uppsala Biomedical Center, Uppsala University, Uppsala, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chimera of Gelsolin domain 1 and C-Terminal domain of thymosin Beta-4
G
147Homo sapiensMutation(s): 0 
Gene Names: GSN
Find proteins for P06396 (Homo sapiens)
Go to Gene View: GSN
Go to UniProtKB:  P06396
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Actin, alpha
A
370Oryctolagus cuniculusMutation(s): 0 
Gene Names: ACTA1 (ACTA)
Find proteins for P68135 (Oryctolagus cuniculus)
Go to Gene View: ACTA1
Go to UniProtKB:  P68135
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download SDF File 
Download CCD File 
A
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A, G
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.144 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 56.850α = 90.00
b = 69.335β = 94.93
c = 80.233γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-09-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-08-23
    Type: Source and taxonomy