4Z68

Hybrid structural analysis of the Arp2/3 regulator Arpin identifies its acidic tail as a primary binding epitope


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.174 

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Literature

Hybrid Structural Analysis of the Arp2/3 Regulator Arpin Identifies Its Acidic Tail as a Primary Binding Epitope.

Fetics, S.Thureau, A.Campanacci, V.Aumont-Nicaise, M.Dang, I.Gautreau, A.Perez, J.Cherfils, J.

(2016) Structure 24: 252-260

  • DOI: 10.1016/j.str.2015.12.001
  • Primary Citation of Related Structures:  
    4Z68

  • PubMed Abstract: 
  • Arpin is a newly discovered regulator of actin polymerization at the cell leading edge, which steers cell migration by exerting a negative control on the Arp2/3 complex. Arpin proteins have an acidic tail homologous to the acidic motif of the VCA domain ...

    Arpin is a newly discovered regulator of actin polymerization at the cell leading edge, which steers cell migration by exerting a negative control on the Arp2/3 complex. Arpin proteins have an acidic tail homologous to the acidic motif of the VCA domain of nucleation-promoting factors (NPFs). This tail is predicted to compete with the VCA of NPFs for binding to the Arp2/3 complex, thereby mitigating activation and/or tethering of the complex to sites of actin branching. Here, we investigated the structure of full-length Arpin using synchrotron small-angle X-ray scattering, and of its acidic tail in complex with an ankyrin repeats domain using X-ray crystallography. The data were combined in a hybrid model in which the acidic tail extends from the globular core as a linear peptide and forms a primary epitope that is readily accessible in unbound Arpin and suffices to tether Arpin to interacting proteins with high affinity.


    Organizational Affiliation

    Laboratoire de Pharmacologie et Biologie Appliquée, UMR 8113, CNRS-Ecole Normale Supérieure de Cachan, 61 Avenue du Président Wilson, 94235 Cachan Cedex, France; Laboratoire d'Enzymologie et Biochimie Structurales, CNRS UPR3082, 91190 Gif-sur-Yvette, France. Electronic address: jacqueline.cherfils@ens-cachan.fr.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tankyrase-2 A155Homo sapiensMutation(s): 0 
Gene Names: TNKS2PARP5BTANK2TNKL
EC: 2.4.2.30 (PDB Primary Data), 2.4.2 (UniProt)
Find proteins for Q9H2K2 (Homo sapiens)
Explore Q9H2K2 
Go to UniProtKB:  Q9H2K2
NIH Common Fund Data Resources
PHAROS:  Q9H2K2
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
GLU-ILE-ARG-GLU-GLN-GLY-ASP-GLY-ALA-GLU-ASP-GLU E12Homo sapiensMutation(s): 0 
Gene Names: ARPINC15orf38
Find proteins for Q7Z6K5 (Homo sapiens)
Explore Q7Z6K5 
Go to UniProtKB:  Q7Z6K5
NIH Common Fund Data Resources
PHAROS:  Q7Z6K5
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.174 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 29.543α = 90
b = 43.806β = 90
c = 107.637γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
French National Research AgencyFrance--

Revision History 

  • Version 1.0: 2015-12-30
    Type: Initial release
  • Version 1.1: 2016-01-27
    Changes: Database references
  • Version 1.2: 2016-02-10
    Changes: Database references
  • Version 1.3: 2017-09-06
    Changes: Author supporting evidence