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Open data
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Basic information
Entry | Database: PDB / ID: 8t1j | ||||||
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Title | Uncrosslinked nNOS-CaM oxygenase homodimer | ||||||
![]() | Nitric oxide synthase 1 | ||||||
![]() | CYTOSOLIC PROTEIN / Calmodulin / Complex | ||||||
Function / homology | ![]() Nitric oxide stimulates guanylate cyclase / negative regulation of hepatic stellate cell contraction / positive regulation of adenylate cyclase-activating adrenergic receptor signaling pathway / 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 / positive regulation of sodium ion transmembrane transport ...Nitric oxide stimulates guanylate cyclase / negative regulation of hepatic stellate cell contraction / positive regulation of adenylate cyclase-activating adrenergic receptor signaling pathway / 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 / positive regulation of sodium ion transmembrane transport / response to nitric oxide / nitric oxide metabolic process / postsynaptic specialization, intracellular component / positive regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / Ion homeostasis / negative regulation of cytosolic calcium ion concentration / peptidyl-cysteine S-nitrosylation / cadmium ion binding / positive regulation of the force of heart contraction / calyx of Held / negative regulation of potassium ion transport / behavioral response to cocaine / negative regulation of calcium ion transport / negative regulation of serotonin uptake / regulation of neurogenesis / nitric-oxide synthase (NADPH) / response to vitamin E / sodium channel regulator activity / regulation of postsynaptic membrane potential / postsynaptic density, intracellular component / negative regulation of insulin secretion / nitric oxide mediated signal transduction / multicellular organismal response to stress / nitric-oxide synthase activity / xenobiotic catabolic process / NADPH binding / arginine catabolic process / striated muscle contraction / regulation of sodium ion transport / nitric oxide-cGMP-mediated signaling / T-tubule / response to organonitrogen compound / sarcoplasmic reticulum membrane / cellular response to epinephrine stimulus / nitric oxide biosynthetic process / negative regulation of blood pressure / photoreceptor inner segment / response to nutrient levels / response to hormone / response to activity / secretory granule / sarcoplasmic reticulum / positive regulation of long-term synaptic potentiation / establishment of localization in cell / muscle contraction / cell periphery / female pregnancy / phosphoprotein binding / response to lead ion / response to nicotine / potassium ion transport / establishment of protein localization / response to organic cyclic compound / cellular response to growth factor stimulus / sarcolemma / response to peptide hormone / Z disc / cellular response to mechanical stimulus / response to estrogen / vasodilation / calcium ion transport / calcium-dependent protein binding / FMN binding / positive regulation of peptidyl-serine phosphorylation / NADP binding / flavin adenine dinucleotide binding / ATPase binding / response to heat / scaffold protein binding / nuclear membrane / response to ethanol / mitochondrial outer membrane / transmembrane transporter binding / negative regulation of neuron apoptotic process / response to lipopolysaccharide / dendritic spine / postsynaptic density / cytoskeleton / calmodulin binding / response to hypoxia / membrane raft / negative regulation of cell population proliferation / glutamatergic synapse / synapse / dendrite / heme binding / negative regulation of apoptotic process / positive regulation of DNA-templated transcription / perinuclear region of cytoplasm / enzyme binding Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.7 Å | ||||||
![]() | Lee, K. / Pospiech, T.H. / Southworth, D. | ||||||
Funding support | ![]()
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![]() | ![]() 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: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 198.7 KB | Display | ![]() |
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PDB format | ![]() | 130.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.4 MB | Display | ![]() |
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Full document | ![]() | 1.4 MB | Display | |
Data in XML | ![]() | 36.5 KB | Display | |
Data in CIF | ![]() | 51.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 40969MC ![]() 8t1kC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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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.) ![]() ![]() ![]() ![]() #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 |
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Sample preparation
Component | Name: Native CaM-bound nNOS homodimer / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 56 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 138304 / Symmetry type: POINT |