4V0U

The crystal structure of ternary PP1G-PPP1R15B and G-actin complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 7.88 Å
  • R-Value Free: 0.400 
  • R-Value Work: 0.370 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

G-Actin Provides Substrate-Specificity to Eukaryotic Initiation Factor 2Alpha Holophosphatases.

Chen, R.Rato, C.Yan, Y.Crespillo-Casado, A.Clarke, H.J.Harding, H.P.Marciniak, S.J.Read, R.J.Ron, D.

(2015) Elife 4: --

  • DOI: 10.7554/eLife.04871
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Dephosphorylation of eukaryotic translation initiation factor 2a (eIF2a) restores protein synthesis at the waning of stress responses and requires a PP1 catalytic subunit and a regulatory subunit, PPP1R15A/GADD34 or PPP1R15B/CReP. Surprisingly, PPP1R ...

    Dephosphorylation of eukaryotic translation initiation factor 2a (eIF2a) restores protein synthesis at the waning of stress responses and requires a PP1 catalytic subunit and a regulatory subunit, PPP1R15A/GADD34 or PPP1R15B/CReP. Surprisingly, PPP1R15-PP1 binary complexes reconstituted in vitro lacked substrate selectivity. However, selectivity was restored by crude cell lysate or purified G-actin, which joined PPP1R15-PP1 to form a stable ternary complex. In crystal structures of the non-selective PPP1R15B-PP1G complex, the functional core of PPP1R15 made multiple surface contacts with PP1G, but at a distance from the active site, whereas in the substrate-selective ternary complex, actin contributes to one face of a platform encompassing the active site. Computational docking of the N-terminal lobe of eIF2a at this platform placed phosphorylated serine 51 near the active site. Mutagenesis of predicted surface-contacting residues enfeebled dephosphorylation, suggesting that avidity for the substrate plays an important role in imparting specificity on the PPP1R15B-PP1G-actin ternary complex.


    Organizational Affiliation

    Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACTIN, ALPHA SKELETAL MUSCLE
A, B, C, L, M
375Oryctolagus cuniculusGene Names: ACTA1 (ACTA)
Find proteins for P68135 (Oryctolagus cuniculus)
Go to Gene View: ACTA1
Go to UniProtKB:  P68135
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SERINE/THREONINE-PROTEIN PHOSPHATASE PP1-GAMMA CATALYTIC SUBUNIT
D, F, H, J, N
323Mus musculusGene Names: Ppp1cc
EC: 3.1.3.16
Find proteins for P63087 (Mus musculus)
Go to UniProtKB:  P63087
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
PROTEIN PHOSPHATASE 1 REGULATORY SUBUNIT 15B
E, G, I, K, O
84Homo sapiensGene Names: PPP1R15B
Find proteins for Q5SWA1 (Homo sapiens)
Go to Gene View: PPP1R15B
Go to UniProtKB:  Q5SWA1
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download SDF File 
Download CCD File 
A, B, C, L, M
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
MN
Query on MN

Download SDF File 
Download CCD File 
D, F, H, J, N
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
LAB
Query on LAB

Download SDF File 
Download CCD File 
A, B, C, L, M
LATRUNCULIN B
C20 H29 N O5 S
NSHPHXHGRHSMIK-JRIKCGFMSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 7.88 Å
  • R-Value Free: 0.400 
  • R-Value Work: 0.370 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 103.910α = 90.00
b = 149.930β = 91.03
c = 318.720γ = 90.00
Software Package:
Software NamePurpose
Aimlessdata scaling
CCP4Iphasing
REFMACrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-03-25
    Type: Initial release