3EGH

Crystal structure of a complex between Protein Phosphatase 1 alpha (PP1), the PP1 binding and PDZ domains of Spinophilin and the small natural molecular toxin Nodularin-R


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Spinophilin directs protein phosphatase 1 specificity by blocking substrate binding sites.

Ragusa, M.J.Dancheck, B.Critton, D.A.Nairn, A.C.Page, R.Peti, W.

(2010) Nat.Struct.Mol.Biol. 17: 459-464

  • DOI: 10.1038/nsmb.1786
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The serine/threonine protein phosphatase 1 (PP1) dephosphorylates hundreds of key biological targets. PP1 associates with >or=200 regulatory proteins to form highly specific holoenzymes. These regulatory proteins target PP1 to its point of action wit ...

    The serine/threonine protein phosphatase 1 (PP1) dephosphorylates hundreds of key biological targets. PP1 associates with >or=200 regulatory proteins to form highly specific holoenzymes. These regulatory proteins target PP1 to its point of action within the cell and prime its enzymatic specificity for particular substrates. However, how they direct PP1's specificity is not understood. Here we show that spinophilin, a neuronal PP1 regulator, is entirely unstructured in its unbound form, and it binds PP1 through a folding-upon-binding mechanism in an elongated fashion, blocking one of PP1's three putative substrate binding sites without altering its active site. This mode of binding is sufficient for spinophilin to restrict PP1's activity toward a model substrate in vitro without affecting its ability to dephosphorylate its neuronal substrate, glutamate receptor 1 (GluR1). Thus, our work provides the molecular basis for the ability of spinophilin to dictate PP1 substrate specificity.


    Organizational Affiliation

    Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, Rhode Island, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit
A, B
329Homo sapiensGene Names: PPP1CA (PPP1A)
EC: 3.1.3.16
Find proteins for P62136 (Homo sapiens)
Go to Gene View: PPP1CA
Go to UniProtKB:  P62136
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Spinophilin
C, D
170Rattus norvegicusGene Names: Ppp1r9b
Find proteins for O35274 (Rattus norvegicus)
Go to UniProtKB:  O35274
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
nodularin R
E, F
5N/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A, B
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A, C
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000214
Query on PRD_000214
ENODULARIN-ROligopeptide / Toxin

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.192 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 119.409α = 90.00
b = 84.426β = 93.58
c = 109.314γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
REFMACphasing
REFMACrefinement
DENZOdata reduction
HKL-2000data scaling
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-03-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.2: 2012-12-12
    Type: Other
  • Version 1.3: 2013-04-10
    Type: Derived calculations
  • Version 1.4: 2017-10-25
    Type: Advisory, Refinement description