4B1U

Structure of the Phactr1 RPEL domain and RPEL motif directed assemblies with G-actin reveal the molecular basis for actin binding cooperativity.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structures of the Phactr1 Rpel Domain and Rpel Motif Complexes with G-Actin Reveal the Molecular Basis for Actin Binding Cooperativity.

Mouilleron, S.Wiezlak, M.O'Reilly, N.Treisman, R.Mcdonald, N.Q.

(2012) Structure 20: 1960

  • DOI: 10.1016/j.str.2012.08.031
  • Primary Citation of Related Structures:  4B1V, 4B1W, 4B1X, 4B1Y, 4B1Z

  • PubMed Abstract: 
  • The Phactr family of PP1-binding proteins and the myocardin-related transcription factor family of transcriptional coactivators contain regulatory domains comprising three copies of the RPEL motif, a G-actin binding element. We report the structure o ...

    The Phactr family of PP1-binding proteins and the myocardin-related transcription factor family of transcriptional coactivators contain regulatory domains comprising three copies of the RPEL motif, a G-actin binding element. We report the structure of a Phactr1 G-actin⋅RPEL domain complex. Three G-actins surround the crank-shaped RPEL domain forming a closed helical assembly. Their spatial relationship is identical to the RPEL-actins within the pentavalent MRTF G-actin⋅RPEL domain complex, suggesting that conserved cooperative interactions between actin⋅RPEL units organize the assembly. In the trivalent Phactr1 complex, each G-actin⋅RPEL unit makes secondary contacts with its downstream actin involving distinct RPEL residues. Similar secondary contacts are seen in G-actin⋅RPEL peptide crystals. Loss-of-secondary-contact mutations destabilize the Phactr1 G-actin⋅RPEL assembly. Furthermore, actin-mediated inhibition of Phactr1 nuclear import requires secondary contact residues in the Phactr1 N-terminal RPEL-N motif, suggesting that it involves interaction of RPEL-N with the C-terminal assembly. Secondary actin contacts by actin-bound RPEL motifs thus govern formation of multivalent actin⋅RPEL assemblies.


    Organizational Affiliation

    Structural Biology, CRUK London Research Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACTIN, ALPHA SKELETAL MUSCLE
B
376Mus musculusGene Names: Acta1 (Acta)
Find proteins for P68134 (Mus musculus)
Go to UniProtKB:  P68134
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PHOSPHATASE AND ACTIN REGULATOR 1
M
32Mus musculusGene Names: Phactr1
Find proteins for Q2M3X8 (Mus musculus)
Go to UniProtKB:  Q2M3X8
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

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

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Download CCD File 
M
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
LAB
Query on LAB

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Download CCD File 
B
LATRUNCULIN B
C20 H29 N O5 S
NSHPHXHGRHSMIK-JRIKCGFMSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
TRS
Query on TRS

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B
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.195 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 77.600α = 90.00
b = 77.600β = 90.00
c = 128.230γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-31
    Type: Initial release
  • Version 1.1: 2014-10-22
    Type: Database references