2AWW

Synapse associated protein 97 PDZ2 domain variant C378G with C-terminal GluR-A peptide

DOI: 10.2210/pdb2AWW/pdb

Classification: MEMBRANE PROTEIN
Organism(s): Rattus norvegicus
Expression System: Escherichia coli BL21(DE3)
Mutation(s): Yes

Deposited: 2005-09-02 Released: 2006-08-29
Deposition Author(s): Von Ossowski, I., Oksanen, E., Von Ossowski, L., Cai, C., Sundberg, M., Goldman, A., Keinanen, K.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.21 Å
R-Value Free: 0.326
R-Value Work: 0.242
R-Value Observed: 0.246

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history.

Literature

Crystal structure of the second PDZ domain of SAP97 in complex with a GluR-A C-terminal peptide

von Ossowski, I., Oksanen, E., von Ossowski, L., Cai, C., Sundberg, M., Goldman, A., Keinanen, K.

(2006) FEBS J 273: 5219-5229

PubMed: 17069616 Search on PubMed
DOI: 10.1111/j.1742-4658.2006.05521.x
Primary Citation of Related Structures:
2AWX, 2AWW, 2AWU, 2G2L

PubMed Abstract:

Synaptic targeting of GluR-A subunit-containing glutamate receptors involves an interaction with synapse-associated protein 97 (SAP97). The C-terminus of GluR-A, which contains a class I PDZ ligand motif (-x-Ser/Thr-x-phi-COOH where phi is an aliphatic amino acid) associates preferentially with the second PDZ domain of SAP97 (SAP97(PDZ2)). To understand the structural basis of this interaction, we have determined the crystal structures of wild-type and a SAP97(PDZ2) variant in complex with an 18-mer C-terminal peptide (residues 890-907) of GluR-A and of two variant PDZ2 domains in unliganded state at 1.8-2.44 A resolutions. SAP97(PDZ2) folds to a compact globular domain comprising six beta-strands and two alpha-helices, a typical architecture for PDZ domains. In the structure of the peptide complex, only the last four C-terminal residues of the GluR-A are visible, and align as an antiparallel beta-strand in the binding groove of SAP97(PDZ2). The free carboxylate group and the aliphatic side chain of the C-terminal leucine (Leu907), and the hydroxyl group of Thr905 of the GluR-A peptide are engaged in essential class I PDZ interactions. Comparison between the free and complexed structures reveals conformational changes which take place upon peptide binding. The betaAlpha-betaBeta loop moves away from the C-terminal end of alphaB leading to a slight opening of the binding groove, which may better accommodate the peptide ligand. The two conformational states are stabilized by alternative hydrogen bond and coulombic interactions of Lys324 in betaAlpha-betaBeta loop with Asp396 or Thr394 in betaBeta. Results of in vitro binding and immunoprecipitation experiments using a PDZ motif-destroying L907A mutation as well as the insertion of an extra alanine residue between the C-terminal Leu907 and the stop codon are also consistent with a 'classical' type I PDZ interaction between SAP97 and GluR-A C-terminus.

Organizational Affiliation:

Department of Biological and Environmental Sciences (Division of Biochemistry), University of Helsinki, Finland.

Macromolecules

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(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Synapse associated protein 97	A, B	105	Rattus norvegicus	Mutation(s): 1 Gene Names: Dlg1, Dlgh1
Find proteins for Q62696 (Rattus norvegicus) Explore Q62696 Go to UniProtKB: Q62696
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Reference Sequence

Find similar proteins by: Sequence | Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
18-residue C-terminal peptide from glutamate receptor, ionotropic, AMPA1	C	18	N/A	Mutation(s): 0
Find proteins for P19490 (Rattus norvegicus) Explore P19490 Go to UniProtKB: P19490
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Reference Sequence