4V0W

The crystal structure of mouse PP1G in complex with truncated human PPP1R15B (631-669)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.174 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

G-actin provides substrate-specificity to eukaryotic initiation factor 2 alpha 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:  
    4V0U, 4V0V, 4V0W, 4V0X

  • 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, PPP1R15-PP1 binary complexes reconstituted in vitro lacked substrate selectivity ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SERINE/THREONINE-PROTEIN PHOSPHATASE PP1-GAMMA CATALYTIC SUBUNITA, C295Mus musculusMutation(s): 0 
Gene Names: Ppp1cc
EC: 3.1.3.16
UniProt & NIH Common Fund Data Resources
Find proteins for P63087 (Mus musculus)
Explore P63087 
Go to UniProtKB:  P63087
IMPC:  MGI:104872
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63087
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN PHOSPHATASE 1 REGULATORY SUBUNIT 15BB, D44Homo sapiensMutation(s): 0 
Gene Names: PPP1R15B
UniProt & NIH Common Fund Data Resources
Find proteins for Q5SWA1 (Homo sapiens)
Explore Q5SWA1 
Go to UniProtKB:  Q5SWA1
PHAROS:  Q5SWA1
GTEx:  ENSG00000158615 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SWA1
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.174 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.01α = 90
b = 67.86β = 90
c = 156.75γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling
CCP4Iphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-25
    Type: Initial release
  • Version 1.1: 2019-02-27
    Changes: Data collection, Database references, Other