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Solution Structure of Synbindin Atypical PDZ Domain and Interaction with Syndecan-2

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Synbindin is one component of Transport protein particle (TRAPP) complexes. In the hippocampal neurons, synbindin binds syndecan-2 by its atypical PDZ domain (APD) and may regulate the formation of dendritic spines. To investigate the interaction of synbindin and syndecan-2, we determined the solution structure of the synbindin APD by NMR. The structure of APD is different from the classical canonical PDZ domains by lacking the typical αA helix and the signature sequence Gly-Ψ-Gly-Ψ. These differences indicate that APD may not bind syndecan-2 with the typical binding mode of other PDZ domain proteins. In NMR titration experiments, APD do not bind with the C-terminal TKEFYA peptide of syndecan-2, but can interact with the 32-residue cytoplasmic domain of syndecan-2 very weakly.





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Keywords: NMR; PDZ domain; Synbindin; protein interaction; syndecan

Document Type: Research Article

Publication date: 2009-02-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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