+Open data
-Basic information
Entry | Database: PDB / ID: 8t1k | ||||||
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Title | DSBU crosslinked nNOS-CaM oxygenase homodimer | ||||||
Components | Nitric oxide synthase 1 | ||||||
Keywords | CYTOSOLIC PROTEIN / Complex | ||||||
Function / homology | Function and homology information Nitric oxide stimulates guanylate cyclase / negative regulation of hepatic stellate cell contraction / synaptic signaling by nitric oxide / negative regulation of iron ion transmembrane transport / ROS and RNS production in phagocytes / azurophil granule / negative regulation of vasoconstriction / retrograde trans-synaptic signaling by nitric oxide / Ion homeostasis / positive regulation of sodium ion transmembrane transport ...Nitric oxide stimulates guanylate cyclase / negative regulation of hepatic stellate cell contraction / synaptic signaling by nitric oxide / negative regulation of iron ion transmembrane transport / ROS and RNS production in phagocytes / azurophil granule / negative regulation of vasoconstriction / retrograde trans-synaptic signaling by nitric oxide / Ion homeostasis / positive regulation of sodium ion transmembrane transport / positive regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / response to nitric oxide / postsynaptic specialization, intracellular component / nitric oxide metabolic process / negative regulation of cytosolic calcium ion concentration / peptidyl-cysteine S-nitrosylation / behavioral response to cocaine / postsynaptic density, intracellular component / cadmium ion binding / positive regulation of the force of heart contraction / negative regulation of potassium ion transport / calyx of Held / negative regulation of calcium ion transport / negative regulation of serotonin uptake / sodium channel regulator activity / regulation of neurogenesis / striated muscle contraction / negative regulation of insulin secretion / response to vitamin E / nitric-oxide synthase (NADPH) / regulation of postsynaptic membrane potential / multicellular organismal response to stress / xenobiotic catabolic process / nitric-oxide synthase activity / negative regulation of peptidyl-serine phosphorylation / nitric oxide mediated signal transduction / arginine catabolic process / NADPH binding / regulation of sodium ion transport / response to organonitrogen compound / cellular response to epinephrine stimulus / sarcoplasmic reticulum membrane / T-tubule / photoreceptor inner segment / nitric oxide biosynthetic process / negative regulation of blood pressure / response to hormone / response to nutrient levels / response to activity / response to nicotine / sarcoplasmic reticulum / muscle contraction / secretory granule / female pregnancy / positive regulation of long-term synaptic potentiation / cell periphery / establishment of localization in cell / phosphoprotein binding / response to lead ion / sarcolemma / establishment of protein localization / potassium ion transport / response to organic cyclic compound / response to peptide hormone / cellular response to growth factor stimulus / Z disc / vasodilation / cellular response to mechanical stimulus / response to estrogen / calcium-dependent protein binding / calcium ion transport / FMN binding / flavin adenine dinucleotide binding / positive regulation of peptidyl-serine phosphorylation / NADP binding / ATPase binding / response to heat / scaffold protein binding / response to ethanol / nuclear membrane / negative regulation of neuron apoptotic process / mitochondrial outer membrane / transmembrane transporter binding / response to lipopolysaccharide / dendritic spine / postsynaptic density / response to hypoxia / cytoskeleton / calmodulin binding / membrane raft / negative regulation of cell population proliferation / dendrite / glutamatergic synapse / synapse / heme binding / negative regulation of apoptotic process / perinuclear region of cytoplasm / positive regulation of DNA-templated transcription / enzyme binding / positive regulation of transcription by RNA polymerase II Similarity search - Function | ||||||
Biological species | Rattus norvegicus (Norway rat) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.14 Å | ||||||
Authors | Lee, K. / Pospiech, T.H. / Southworth, D. | ||||||
Funding support | United States, 1items
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Citation | Journal: J Biol Chem / Year: 2024 Title: Mapping interactions of calmodulin and neuronal NO synthase by crosslinking and mass spectrometry. Authors: Dana Felker / Kanghyun Lee / Thomas H Pospiech / Yoshihiro Morishima / Haoming Zhang / Miranda Lau / Daniel R Southworth / Yoichi Osawa / Abstract: Neuronal nitric oxide synthase (nNOS) is a homodimeric cytochrome P450-like enzyme that catalyzes the conversion of L-arginine to nitric oxide in the presence of NADPH and molecular oxygen. The ...Neuronal nitric oxide synthase (nNOS) is a homodimeric cytochrome P450-like enzyme that catalyzes the conversion of L-arginine to nitric oxide in the presence of NADPH and molecular oxygen. The binding of calmodulin (CaM) to a linker region between the FAD/FMN-containing reductase domain, and the heme-containing oxygenase domain is needed for electron transfer reactions, reduction of the heme, and NO synthesis. Due to the dynamic nature of the reductase domain and low resolution of available full-length structures, the exact conformation of the CaM-bound active complex during heme reduction is still unresolved. Interestingly, hydrogen-deuterium exchange and mass spectrometry studies revealed interactions of the FMN domain and CaM with the oxygenase domain for iNOS, but not nNOS. This finding prompted us to utilize covalent crosslinking and mass spectrometry to clarify interactions of CaM with nNOS. Specifically, MS-cleavable bifunctional crosslinker disuccinimidyl dibutyric urea was used to identify thirteen unique crosslinks between CaM and nNOS as well as 61 crosslinks within the nNOS. The crosslinks provided evidence for CaM interaction with the oxygenase and reductase domain residues as well as interactions of the FMN domain with the oxygenase dimer. Cryo-EM studies, which gave a high-resolution model of the oxygenase domain, along with crosslink-guided docking provided a model of nNOS that brings the FMN within 15 Å of the heme in support for a more compact conformation than previously observed. These studies also point to the utility of covalent crosslinking and mass spectrometry in capturing transient dynamic conformations that may not be captured by hydrogen-deuterium exchange and mass spectrometry experiments. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8t1k.cif.gz | 199.8 KB | Display | PDBx/mmCIF format |
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PDB format | pdb8t1k.ent.gz | 130.9 KB | Display | PDB format |
PDBx/mmJSON format | 8t1k.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/t1/8t1k ftp://data.pdbj.org/pub/pdb/validation_reports/t1/8t1k | HTTPS FTP |
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-Related structure data
Related structure data | 40970MC 8t1jC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
#1: Protein | Mass: 160769.562 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Nos1, Bnos / Production host: Escherichia coli (E. coli) / References: UniProt: P29476, nitric-oxide synthase (NADPH) #2: Chemical | ChemComp-ZN / | #3: Chemical | #4: Chemical | #5: Chemical | Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: DSBU crosslinked CaM-bound nNOS homodimer / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: Rattus norvegicus (Norway rat) |
Source (recombinant) | Organism: Escherichia coli (E. coli) |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
-Electron microscopy imaging
Microscopy | Model: TFS GLACIOS |
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Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 62 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
-Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 3.14 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 294924 / Symmetry type: POINT |
Refinement | Highest resolution: 3.14 Å |