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- PDB-8t1j: Uncrosslinked nNOS-CaM oxygenase homodimer -

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Basic information

Entry
Database: PDB / ID: 8t1j
TitleUncrosslinked nNOS-CaM oxygenase homodimer
ComponentsNitric oxide synthase 1
KeywordsCYTOSOLIC PROTEIN / Calmodulin / Complex
Function / homology
Function and homology information


Nitric oxide stimulates guanylate cyclase / negative regulation of hepatic stellate cell contraction / positive regulation of adenylate cyclase-activating adrenergic receptor signaling pathway / retrograde trans-synaptic signaling by nitric oxide / synaptic signaling by nitric oxide / negative regulation of iron ion transmembrane transport / ROS and RNS production in phagocytes / azurophil granule / negative regulation of vasoconstriction / 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 / retrograde trans-synaptic signaling by nitric oxide / synaptic signaling by nitric oxide / negative regulation of iron ion transmembrane transport / ROS and RNS production in phagocytes / azurophil granule / negative regulation of vasoconstriction / positive regulation of sodium ion transmembrane transport / postsynaptic specialization, intracellular component / nitric oxide metabolic process / positive regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / response to nitric oxide / Ion homeostasis / negative regulation of cytosolic calcium ion concentration / peptidyl-cysteine S-nitrosylation / cadmium ion binding / positive regulation of the force of heart contraction / negative regulation of potassium ion transport / negative regulation of calcium ion transport / behavioral response to cocaine / regulation of postsynaptic membrane potential / calyx of Held / regulation of neurogenesis / postsynaptic density, intracellular component / negative regulation of serotonin uptake / nitric-oxide synthase (NADPH) / multicellular organismal response to stress / response to vitamin E / sodium channel regulator activity / nitric oxide mediated signal transduction / negative regulation of insulin secretion / nitric-oxide synthase activity / xenobiotic catabolic process / arginine catabolic process / NADPH binding / striated muscle contraction / regulation of sodium ion transport / nitric oxide-cGMP-mediated signaling / T-tubule / nitric oxide biosynthetic process / cellular response to epinephrine stimulus / sarcoplasmic reticulum membrane / negative regulation of blood pressure / photoreceptor inner segment / response to hormone / response to nutrient levels / secretory granule / sarcoplasmic reticulum / positive regulation of long-term synaptic potentiation / establishment of localization in cell / response to activity / cell periphery / female pregnancy / response to nicotine / phosphoprotein binding / response to lead ion / establishment of protein localization / potassium ion transport / caveola / cellular response to growth factor stimulus / response to organic cyclic compound / sarcolemma / Z disc / response to peptide hormone / cellular response to mechanical stimulus / response to estrogen / vasodilation / calcium-dependent protein binding / calcium ion transport / FMN binding / positive regulation of peptidyl-serine phosphorylation / flavin adenine dinucleotide binding / NADP binding / ATPase binding / response to heat / scaffold protein binding / nuclear membrane / response to ethanol / negative regulation of neuron apoptotic process / mitochondrial outer membrane / transmembrane transporter binding / response to lipopolysaccharide / dendritic spine / postsynaptic density / cytoskeleton / response to hypoxia / calmodulin binding / membrane raft / negative regulation of cell population proliferation / glutamatergic synapse / dendrite / heme binding / synapse / negative regulation of apoptotic process / positive regulation of DNA-templated transcription / perinuclear region of cytoplasm / enzyme binding / positive regulation of transcription by RNA polymerase II
Similarity search - Function
Nitric-oxide synthase, eukaryote / Nitric oxide synthase, N-terminal / Nitric oxide synthase, N-terminal domain superfamily / Nitric oxide synthase, domain 2 superfamily / Nitric oxide synthase, domain 1 superfamily / Nitric oxide synthase, domain 3 superfamily / : / Nitric oxide synthase, oxygenase domain / Nitric oxide synthase (NOS) signature. / Sulfite reductase [NADPH] flavoprotein alpha-component-like, FAD-binding ...Nitric-oxide synthase, eukaryote / Nitric oxide synthase, N-terminal / Nitric oxide synthase, N-terminal domain superfamily / Nitric oxide synthase, domain 2 superfamily / Nitric oxide synthase, domain 1 superfamily / Nitric oxide synthase, domain 3 superfamily / : / Nitric oxide synthase, oxygenase domain / Nitric oxide synthase (NOS) signature. / Sulfite reductase [NADPH] flavoprotein alpha-component-like, FAD-binding / NADPH-cytochrome p450 reductase, FAD-binding, alpha-helical domain superfamily / FAD binding domain / Flavodoxin-like / Flavoprotein pyridine nucleotide cytochrome reductase / Flavodoxin / Flavodoxin-like domain profile. / Flavodoxin/nitric oxide synthase / Oxidoreductase FAD/NAD(P)-binding / Oxidoreductase NAD-binding domain / FAD-binding domain, ferredoxin reductase-type / Ferredoxin-NADP reductase (FNR), nucleotide-binding domain / Ferredoxin reductase-type FAD binding domain profile. / Riboflavin synthase-like beta-barrel / PDZ domain / Flavoprotein-like superfamily / PDZ domain profile. / Domain present in PSD-95, Dlg, and ZO-1/2. / PDZ domain / PDZ superfamily
Similarity search - Domain/homology
ARGININE / 5,6,7,8-TETRAHYDROBIOPTERIN / PROTOPORPHYRIN IX CONTAINING FE / Nitric oxide synthase 1
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsLee, K. / Pospiech, T.H. / Southworth, D.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM077430 United States
CitationJournal: 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
DepositionJun 2, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 29, 2023Provider: repository / Type: Initial release
Revision 1.1Dec 27, 2023Group: Database references / Category: citation / citation_author / Item: _citation.journal_volume / _citation_author.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Nitric oxide synthase 1
B: Nitric oxide synthase 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)323,6709
Polymers321,5392
Non-polymers2,1317
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: cross-linking, mass spectrometry
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Nitric oxide synthase 1 / Constitutive NOS / NC-NOS / NOS type I / Neuronal NOS / N-NOS / nNOS / Nitric oxide synthase / ...Constitutive NOS / NC-NOS / NOS type I / Neuronal NOS / N-NOS / nNOS / Nitric oxide synthase / brain / bNOS / Peptidyl-cysteine S-nitrosylase NOS1


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 / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-ARG / ARGININE


Type: L-peptide linking / Mass: 175.209 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C6H15N4O2 / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-H4B / 5,6,7,8-TETRAHYDROBIOPTERIN


Mass: 241.247 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C9H15N5O3 / Feature type: SUBJECT OF INVESTIGATION / Comment: neurotransmitter*YM
#5: Chemical ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C34H32FeN4O4 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Native CaM-bound nNOS homodimer / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Rattus norvegicus (Norway rat)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 56 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 138304 / Symmetry type: POINT

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