title: Solution structure of the extended neuronal nitric oxide synthase PDZ domain complexed with an associated peptide.
abstract: The PDZ domain of neuronal nitric oxide synthase (nNOS) functions as a scaffold for organizing the signal transduction complex of the enzyme. The NMR structure of a complex composed of the nNOS PDZ domain and an associated peptide suggests that a two-stranded beta-sheet C-terminal to the canonical PDZ domain may mediate its interaction with the PDZ domains of postsynaptic density-95 and alpha-syntrophin. The structure also provides the molecular basis of recognition of Asp-X-Val-COOH peptides by the nNOS PDZ domain. The role of the C-terminal extension in Asp-X-Val-COOH peptide binding is investigated. Additionally, NMR studies further show that the Asp-X-Val-COOH peptide and a C-terminal peptide from a novel cytosolic protein named CAPON bind to the same pocket of the nNOS PDZ domain.
authors.affiliation: Department of Biochemistry, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, PR China.
authors.forename: H
authors.initials: H
authors.lastname: Tochio
authors.forename: Q
authors.initials: Q
authors.lastname: Zhang
authors.forename: P
authors.initials: P
authors.lastname: Mandal
authors.forename: M
authors.initials: M
authors.lastname: Li
authors.forename: M
authors.initials: M
authors.lastname: Zhang
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000737:chemistry / Q000378:metabolism; D000818:Animals; D001665:Binding Sites; D002352:Carrier Proteins / Q000737:chemistry / Q000378:metabolism; D019281:Dimerization; D008954:Models, Biological; D008958:Models, Molecular; D008969:Molecular Sequence Data; D019001:Nitric Oxide Synthase / Q000737:chemistry* / Q000378:metabolism; D052248:Nitric Oxide Synthase Type I; D019906:Nuclear Magnetic Resonance, Biomolecular; D010446:Peptide Fragments / Q000737:chemistry / Q000378:metabolism*; D011485:Protein Binding; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D051381:Rats; D011956:Receptors, Cell Surface / Q000737:chemistry / Q000378:metabolism; D018160:Receptors, Cytoplasmic and Nuclear / Q000737:chemistry / Q000378:metabolism; D044094:Receptors, Melatonin; D012996:Solutions
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D000596:Amino Acids; D002352:Carrier Proteins; C488082:NOS1AP protein, rat; C110667:Nos1ap protein, mouse; D010446:Peptide Fragments; D011956:Receptors, Cell Surface; D018160:Receptors, Cytoplasmic and Nuclear; D044094:Receptors, Melatonin; D012996:Solutions; D019001:Nitric Oxide Synthase; D052248:Nitric Oxide Synthase Type I; C496322:Nos1 protein, rat