4X3I | pdb_00004x3i

The crystal structure of Arc N-lobe complexed with CAMK2A fragment

• PDB DOI: https://doi.org/10.2210/pdb4X3I/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Rattus norvegicus, Mus musculus
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2014-11-30 Released: 2015-06-03 
• Deposition Author(s): Zhang, W., Ward, M., Leahy, D., Worley, P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 
  0.204 (Depositor), 0.204 (DCC) 
• R-Value Work: 
  0.194 (Depositor), 0.194 (DCC) 
• R-Value Observed: 
  0.195 (Depositor) 

Literature

Structural basis of arc binding to synaptic proteins: implications for cognitive disease.

Zhang, W., Wu, J., Ward, M.D., Yang, S., Chuang, Y.A., Xiao, M., Li, R., Leahy, D.J., Worley, P.F.

(2015) Neuron 86: 490-500

• PubMed: 25864631 
• DOI: https://doi.org/10.1016/j.neuron.2015.03.030
• Primary Citation Related Structures: 
  4X3H, 4X3I, 4X3X


• PubMed Abstract: 
  

  Arc is a cellular immediate-early gene (IEG) that functions at excitatory synapses and is required for learning and memory. We report crystal structures of Arc subdomains that form a bi-lobar architecture remarkably similar to the capsid domain of human immunodeficiency virus (HIV) gag protein. Analysis indicates Arc originated from the Ty3/Gypsy retrotransposon family and was "domesticated" in higher vertebrates for synaptic functions. The Arc N-terminal lobe evolved a unique hydrophobic pocket that mediates intermolecular binding with synaptic proteins as resolved in complexes with TARPγ2 (Stargazin) and CaMKII peptides and is essential for Arc's synaptic function. A consensus sequence for Arc binding identifies several additional partners that include genes implicated in schizophrenia. Arc N-lobe binding is inhibited by small chemicals suggesting Arc's synaptic action may be druggable. These studies reveal the remarkable evolutionary origin of Arc and provide a structural basis for understanding Arc's contribution to neural plasticity and disease.

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Organizational Affiliation: 
• Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Department of Nano-Bioengineering, Incheon National University, Incheon, 406-772, Korea.
Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. Electronic address: [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 10.15 kDa 
• Atom Count: 748 
• Modeled Residue Count: 79 
• Deposited Residue Count: 86 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Activity-regulated cytoskeleton-associated protein	A	79	Rattus norvegicus	Mutation(s): 0  Gene Names: Arc
UniProt
Find proteins for Q63053 (Rattus norvegicus) Explore Q63053  Go to UniProtKB:  Q63053

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
CALCIUM/CALMODULIN-DEPENDENT PROTEIN KINASE TYPE II SUBUNIT ALPHA	B	7	Mus musculus	Mutation(s): 0  Gene Names: CAMK2A EC: 2.7.11.17
UniProt
Find proteins for P11798 (Mus musculus) Explore P11798  Go to UniProtKB:  P11798

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free:  0.204 (Depositor), 0.204 (DCC) 
• R-Value Work:  0.194 (Depositor), 0.194 (DCC) 
• R-Value Observed: 0.195 (Depositor) 

Space Group: P 6₅

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 51.527	α = 90
b = 51.527	β = 90
c = 69.929	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-3000	data reduction
HKL-3000	data scaling
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-06-03 
Deposition Author(s): Zhang, W., Ward, M., Leahy, D., Worley, P.

Revision History  

• Version 1.0: 2015-06-03
  Type: Initial release
  
• Version 1.1: 2017-09-27
  Changes: Data collection, Database references, Source and taxonomy, Structure summary
• Version 1.2: 2024-11-06
  Changes: Data collection, Database references, Structure summary