Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 13.27 kDa 
• Atom Count: 1019 
• Residue Count: 117 
• Unique protein chains: 1

2P8V

Crystal structure of human Homer3 EVH1 domain

• DOI: 10.2210/pdb2P8V/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2007-03-23 Released: 2007-11-20 
• Deposition Author(s): Bouyain, S., Tu, J., Huang, G.N., Worley, P.F., Leahy, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.264 
• R-Value Work: 0.222 

Literature

NFAT binding and regulation of T cell activation by the cytoplasmic scaffolding Homer proteins.

Huang, G.N., Huso, D.L., Bouyain, S., Tu, J., McCorkell, K.A., May, M.J., Zhu, Y., Lutz, M., Collins, S., Dehoff, M., Kang, S., Whartenby, K., Powell, J., Leahy, D., Worley, P.F.

(2008) Science 319: 476-481

• PubMed: 18218901 
• DOI: 10.1126/science.1151227
• Primary Citation of Related Structures:  
  2P8V


• PubMed Abstract: 
  

T cell receptor (TCR) and costimulatory receptor (CD28) signals cooperate in activating T cells, although understanding of how these pathways are themselves regulated is incomplete. We found that Homer2 and Homer3, members of the Homer family of cytoplasmic scaffolding proteins, are negative regulators of T cell activation. This is achieved through binding of nuclear factor of activated T cells (NFAT) and by competing with calcineurin. Homer-NFAT binding was also antagonized by active serine-threonine kinase AKT, thereby enhancing TCR signaling via calcineurin-dependent dephosphorylation of NFAT. This corresponded with changes in cytokine expression and an increase in effector-memory T cell populations in Homer-deficient mice, which also developed autoimmune-like pathology. These results demonstrate a further means by which costimulatory signals are regulated to control self-reactivity.

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Organizational Affiliation: 

Program in Biochemistry, Cellular and Molecular Biology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Homer protein homolog 3	A	117	Homo sapiens	Mutation(s): 0  Gene Names: HOMER3
Find proteins for Q9NSC5 (Homo sapiens) Explore Q9NSC5  Go to UniProtKB:  Q9NSC5
NIH Common Fund Data Resources
PHAROS:  Q9NSC5 GTEx:  ENSG00000051128

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.264 
• R-Value Work: 0.222 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.47	α = 90
b = 49.47	β = 90
c = 80.71	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing
CNS	refinement
PDB_EXTRACT	data extraction
ADSC	data collection

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-03-23 
• Released Date: 2007-11-20 
Deposition Author(s): Bouyain, S., Tu, J., Huang, G.N., Worley, P.F., Leahy, D.

Revision History 

• Version 1.0: 2007-11-20
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2017-10-18
  Changes: Refinement description