Primary Citation of Related Structures: 1BE9, 1BFE
PubMed Abstract:
Modular PDZ domains, found in many cell junction-associated proteins, mediate the clustering of membrane ion channels by binding to their C-terminus. The X-ray crystallographic structures of the third PDZ domain from the synaptic protein PSD-95 in complex with and in the absence of its peptide ligand have been determined at 1 ...
Modular PDZ domains, found in many cell junction-associated proteins, mediate the clustering of membrane ion channels by binding to their C-terminus. The X-ray crystallographic structures of the third PDZ domain from the synaptic protein PSD-95 in complex with and in the absence of its peptide ligand have been determined at 1.8 angstroms and 2.3 angstroms resolution, respectively. The structures reveal that a four-residue C-terminal stretch (X-Thr/Ser-X-Val-COO(-)) engages the PDZ domain through antiparallel main chain interactions with a beta sheet of the domain. Recognition of the terminal carboxylate group of the peptide is conferred by a cradle of main chain amides provided by a Gly-Leu-Gly-Phe loop as well as by an arginine side chain. Specific side chain interactions and a prominent hydrophobic pocket explain the selective recognition of the C-terminal consensus sequence.
Related Citations:
Crystal Structure of the Hcask Pdz Domain Reveals the Structural Basis of Class II Pdz Domain Target Recognition Daniels, D.L., Cohen, A.R., Anderson, J.M., Brunger, A.T. (1998) Nat Struct Biol 5: 317
Cript, a Novel Postsynaptic Protein that Binds to the Third Pdz Domain of Psd-95/Sap90 Niethammer, M., Valtschanoff, J.G., Kapoor, T.M., Allison, D.W., Weinberg, T.M., Craig, A.M., Sheng, M. (1998) Neuron 20: 693
Crystal Structure of a Pdz Domain Cabral, M., Petosa, C., Sutcliffe, M.J., Raza, S., Byron, O., Poy, F., Marfatia, S.M., Chishti, A.H., Liddington, R.C. (1996) Nature 382: 649
Organizational Affiliation:
Laboratory of Molecular Neurobiology and Biophysics, The Rockefeller University, New York, NY 10021, USA.
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