5J7J

NMR Derived Structure of Ca2+ Calmodulin bound to Phosphorylated PSD-95


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Ca2+/calmodulin binding to PSD-95 mediates homeostatic synaptic scaling down.

Chowdhury, D.Turner, M.Patriarchi, T.Hergarden, A.C.Anderson, D.Zhang, Y.Sun, J.Chen, C.Y.Ames, J.B.Hell, J.W.

(2018) Embo J. 37: 122-138

  • DOI: 10.15252/embj.201695829

  • PubMed Abstract: 
  • Postsynaptic density protein-95 (PSD-95) localizes AMPA-type glutamate receptors (AMPARs) to postsynaptic sites of glutamatergic synapses. Its postsynaptic displacement is necessary for loss of AMPARs during homeostatic scaling down of synapses. Here ...

    Postsynaptic density protein-95 (PSD-95) localizes AMPA-type glutamate receptors (AMPARs) to postsynaptic sites of glutamatergic synapses. Its postsynaptic displacement is necessary for loss of AMPARs during homeostatic scaling down of synapses. Here, we demonstrate that upon Ca 2+ influx, Ca 2+ /calmodulin (Ca 2+ /CaM) binding to the N-terminus of PSD-95 mediates postsynaptic loss of PSD-95 and AMPARs during homeostatic scaling down. Our NMR structural analysis identified E17 within the PSD-95 N-terminus as important for binding to Ca 2+ /CaM by interacting with R126 on CaM. Mutating E17 to R prevented homeostatic scaling down in primary hippocampal neurons, which is rescued via charge inversion by ectopic expression of CaM R 126E , as determined by analysis of miniature excitatory postsynaptic currents. Accordingly, increased binding of Ca 2+ /CaM to PSD-95 induced by a chronic increase in Ca 2+ influx is a critical molecular event in homeostatic downscaling of glutamatergic synaptic transmission.


    Organizational Affiliation

    Department of Pharmacology, University of California, Davis, CA, USA.,Department of Chemistry, University of California, Davis, CA, USA jbames@ucdavis.edu jwhell@ucdavis.edu.,Department of Chemistry, University of Texas, Edinburgh, TX, USA.,Department of Chemistry, University of California, Davis, CA, USA.,Department of Pharmacology, University of California, Davis, CA, USA jbames@ucdavis.edu jwhell@ucdavis.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calmodulin
A
148Xenopus laevisMutation(s): 0 
Gene Names: calm1
Find proteins for P0DP33 (Xenopus laevis)
Go to UniProtKB:  P0DP33
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Disks large homolog 4
B
19Homo sapiensMutation(s): 0 
Gene Names: DLG4 (PSD95)
Find proteins for P78352 (Homo sapiens)
Go to Gene View: DLG4
Go to UniProtKB:  P78352
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
B
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Mental HealthUnited StatesMH097887
National Institutes of Health/National Eye InstituteUnited StatesEY012347

Revision History 

  • Version 1.0: 2017-10-25
    Type: Initial release
  • Version 1.1: 2019-05-08
    Type: Data collection, Database references