Macromolecule Content

• Total Structure Weight: 9.98 kDa 
• Atom Count: 701 
• Residue Count: 95 
• Unique protein chains: 1

1QLC

Solution structure of the second PDZ domain of Postsynaptic Density-95

• DOI: 10.2210/pdb1QLC/pdb

• Classification: PEPTIDE RECOGNITION
• Organism(s): Rattus norvegicus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1999-08-25 Released: 2000-02-06 
• Deposition Author(s): Tochio, H., Hung, F., Li, M., Zhang, M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 20 

Literature

Solution Structure and Backbone Dynamics of the Second Pdz Domain of Postsynaptic Density-95

Tochio, H., Hung, F., Li, M., Bredt, D.S., Zhang, M.

(2000) J Mol Biol 295: 225

• PubMed: 10623522 
• DOI: 10.1006/jmbi.1999.3350
• Primary Citation of Related Structures:  
  1QLC


• PubMed Abstract: 
  

The second PDZ domain of postsynaptic density-95 (PSD-95 PDZ2) plays a critical role in coupling N-methyl-D-aspartate receptors to neuronal nitric oxide synthase (nNOS). In this work, the solution structure of PSD-95 PDZ2 was determined to high resolution by NMR spectroscopy. The structure of PSD-95 PDZ2 was compared in detail with that of alpha1-syntrophin PDZ domain, as the PDZ domains share similar target interaction properties. The interaction of the PSD-95 PDZ2 with a carboxyl-terminal peptide derived from a cytoplasmic protein CAPON was studied by NMR titration experiments. Complex formation between PSD-95 PDZ2 and the nNOS PDZ was modelled on the basis of the crystal structure of the alpha1-syntrophin PDZ/nNOS PDZ dimer. We found that the prolonged loop connecting the betaB and betaC strands of PSD-95 PDZ2 is likely to play a role in both the binding of the carboxyl-terminal peptide and the nNOS beta-finger. Finally, the backbone dynamics of the PSD-95 PDZ2 in the absence of bound peptide were studied using a model-free approach. The "GLGF"-loop and the loop connecting alphaB and betaF of the protein display some degree of flexibility in solution. The rest of the protein is rigid and lacks detectable slow time-scale (microseconds to milliseconds) motions. In particular, the loop connecting betaB and betaC loop adopts a well-defined, rigid structure in solution. It appears that the loop adopts a pre-aligned conformation for the PDZ domain to interact with its targets.

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Organizational Affiliation: 

Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, Kowloon, P. R. China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
POSTSYNAPTIC DENSITY PROTEIN 95	A	95	Rattus norvegicus	Mutation(s): 0  Gene Names: Dlg4, Dlgh4, Psd95
Find proteins for P31016 (Rattus norvegicus) Explore P31016  Go to UniProtKB:  P31016

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 20 
• OLDERADO: 1QLC Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-08-25 
• Released Date: 2000-02-06 
Deposition Author(s): Tochio, H., Hung, F., Li, M., Zhang, M.

Revision History 

• Version 1.0: 2000-02-06
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance