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- PDB-2g6o: Structure of bovine eNOS heme domain (BH4-free) complexed with CO -

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Basic information

Entry
Database: PDB / ID: 2g6o
TitleStructure of bovine eNOS heme domain (BH4-free) complexed with CO
ComponentsNitric-oxide synthase, endothelial
KeywordsOXIDOREDUCTASE / nitric oxide synthase / heme protein / diatomic ligand
Function / homology
Function and homology information


cellular response to laminar fluid shear stress / negative regulation of leukocyte cell-cell adhesion / nitric-oxide synthase (NADPH) / negative regulation of extrinsic apoptotic signaling pathway via death domain receptors / : / nitric-oxide synthase activity / L-arginine catabolic process / negative regulation of blood pressure / nitric oxide biosynthetic process / response to hormone ...cellular response to laminar fluid shear stress / negative regulation of leukocyte cell-cell adhesion / nitric-oxide synthase (NADPH) / negative regulation of extrinsic apoptotic signaling pathway via death domain receptors / : / nitric-oxide synthase activity / L-arginine catabolic process / negative regulation of blood pressure / nitric oxide biosynthetic process / response to hormone / positive regulation of relaxation of smooth muscle / mitochondrion organization / caveola / response to peptide hormone / blood coagulation / NADP binding / FMN binding / flavin adenine dinucleotide binding / response to lipopolysaccharide / cytoskeleton / calmodulin binding / heme binding / Golgi apparatus / metal ion binding / nucleus / plasma membrane / cytosol
Similarity search - Function
Bovine Endothelial Nitric Oxide Synthase Heme Domain; Chain: A,domain 3 / Nitric Oxide Synthase; Chain A, domain 3 / Nitric Oxide Synthase; Chain A, domain 1 / Nitric Oxide Synthase; Chain A, domain 1 / Nitric Oxide Synthase;Heme Domain; Chain A, domain 2 / Nitric Oxide Synthase;Heme Domain;Chain A domain 2 / Nitric-oxide synthase, eukaryote / Nitric oxide synthase, N-terminal / Nitric oxide synthase, N-terminal domain superfamily / Nitric oxide synthase, domain 2 superfamily ...Bovine Endothelial Nitric Oxide Synthase Heme Domain; Chain: A,domain 3 / Nitric Oxide Synthase; Chain A, domain 3 / Nitric Oxide Synthase; Chain A, domain 1 / Nitric Oxide Synthase; Chain A, domain 1 / Nitric Oxide Synthase;Heme Domain; Chain A, domain 2 / Nitric Oxide Synthase;Heme Domain;Chain A domain 2 / 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 / Flavoprotein-like superfamily / Alpha-Beta Complex / Alpha Beta
Similarity search - Domain/homology
ACETATE ION / ARGININE / CACODYLATE ION / CARBON MONOXIDE / PROTOPORPHYRIN IX CONTAINING FE / Nitric oxide synthase 3
Similarity search - Component
Biological speciesBos taurus (domestic cattle)
MethodX-RAY DIFFRACTION / SYNCHROTRON / FOURIER SYNTHESIS / Resolution: 1.9 Å
AuthorsLi, H. / Igarashi, J. / Jamal, J. / Yang, W. / Poulos, T.L.
Citation
Journal: J.Biol.Inorg.Chem. / Year: 2006
Title: Structural studies of constitutive nitric oxide synthases with diatomic ligands bound.
Authors: Li, H. / Igarashi, J. / Jamal, J. / Yang, W. / Poulos, T.L.
#1: Journal: Biochemistry / Year: 2001
Title: Crystallographic studies on endothelial nitric oxide synthase complexed with nitric oxide and mechanism-based inhibitors.
Authors: Li, H. / Raman, C.S. / Martasek, P. / Masters, B.S. / Poulos, T.L.
History
DepositionFeb 24, 2006Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 8, 2006Provider: repository / Type: Initial release
Revision 1.1May 1, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Non-polymer description / Version format compliance
Revision 1.3Feb 14, 2024Group: Data collection / Database references / Derived calculations
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_struct_conn_angle / struct_conn / struct_site
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_struct_conn_angle.ptnr1_auth_asym_id / _pdbx_struct_conn_angle.ptnr1_auth_comp_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_asym_id / _pdbx_struct_conn_angle.ptnr1_label_atom_id / _pdbx_struct_conn_angle.ptnr1_label_comp_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr2_auth_asym_id / _pdbx_struct_conn_angle.ptnr2_auth_comp_id / _pdbx_struct_conn_angle.ptnr2_auth_seq_id / _pdbx_struct_conn_angle.ptnr2_label_asym_id / _pdbx_struct_conn_angle.ptnr2_label_atom_id / _pdbx_struct_conn_angle.ptnr2_label_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_asym_id / _pdbx_struct_conn_angle.ptnr3_label_atom_id / _pdbx_struct_conn_angle.ptnr3_label_comp_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _pdbx_struct_conn_angle.value / _struct_conn.pdbx_dist_value / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_id / _struct_site.pdbx_auth_asym_id / _struct_site.pdbx_auth_comp_id / _struct_site.pdbx_auth_seq_id
Revision 1.4Aug 12, 2026Group: Advisory / Derived calculations / Structure summary
Category: pdbx_entry_details / pdbx_modification_feature ...pdbx_entry_details / pdbx_modification_feature / pdbx_nonpoly_atom_coordination / pdbx_nonpoly_atom_coordination_sphere / pdbx_nonpoly_atom_coordination_sphere_order / pdbx_struct_conn_angle / pdbx_validate_close_contact / struct_conn / struct_conn_type
Description: Metalloprotein remediation / Provider: repository / Type: Remediation

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Nitric-oxide synthase, endothelial
B: Nitric-oxide synthase, endothelial
hetero molecules


Theoretical massNumber of molelcules
Total (without water)96,08116
Polymers93,7082
Non-polymers2,37314
Water10,953608
1


  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area11470 Å2
ΔGint-89 kcal/mol
Surface area32530 Å2
MethodPISA
Unit cell
Length a, b, c (Å)57.698, 106.382, 155.897
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number19
Space group name H-MP212121

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Components

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Protein , 1 types, 2 molecules AB

#1: Protein Nitric-oxide synthase, endothelial / EC-NOS / NOS type III / NOSIII / Endothelial NOS / eNOS / Constitutive NOS / cNOS


Mass: 46854.027 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: NOS3 / Plasmid: pCWori / Species (production host): Escherichia coli / Production host: Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) / References: UniProt: P29473, nitric-oxide synthase (NADPH)

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Non-polymers , 8 types, 622 molecules

#2: Chemical ChemComp-ACT / ACETATE ION


Mass: 59.044 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C2H3O2
#3: Chemical ChemComp-CAC / CACODYLATE ION / dimethylarsinate


Mass: 136.989 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C2H6AsO2
#4: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#5: Chemical ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C34H32FeN4O4
#6: Chemical ChemComp-ARG / ARGININE


Type: L-peptide linking / Mass: 175.209 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C6H15N4O2
#7: Chemical ChemComp-CMO / CARBON MONOXIDE


Mass: 28.010 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: CO
#8: Chemical ChemComp-GOL / GLYCEROL / GLYCERIN / PROPANE-1,2,3-TRIOL


Mass: 92.094 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C3H8O3
#9: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 608 / Source method: isolated from a natural source / Formula: H2O

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Details

Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 2.55 Å3/Da / Density % sol: 51.79 %
Crystal growTemperature: 280 K / Method: vapor diffusion, sitting drop / pH: 6.5
Details: PEG3350, cacodylate magnessium acetate, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 280K

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: SYNCHROTRON / Site: SSRL / Beamline: BL7-1 / Wavelength: 1.08 Å
DetectorType: MARRESEARCH / Detector: IMAGE PLATE / Date: Dec 3, 1999 / Details: mirrors
RadiationMonochromator: graphite / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.08 Å / Relative weight: 1
ReflectionResolution: 1.9→50 Å / Num. obs: 73961 / % possible obs: 0.982 % / Observed criterion σ(I): -3 / Redundancy: 3.8 % / Biso Wilson estimate: 26 Å2 / Rmerge(I) obs: 0.068 / Rsym value: 0.068 / Net I/σ(I): 7.7
Reflection shellResolution: 1.9→1.95 Å / Redundancy: 3.5 % / Rmerge(I) obs: 0.598 / Mean I/σ(I) obs: 2 / Rsym value: 0.598 / % possible all: 0.994

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Processing

Software
NameVersionClassification
CNS1.1refinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing
RefinementMethod to determine structure: FOURIER SYNTHESIS / Resolution: 1.9→34.96 Å / Rfactor Rfree error: 0.004 / Data cutoff high absF: 2228365.59 / Data cutoff low absF: 0 / Isotropic thermal model: RESTRAINED / Cross valid method: THROUGHOUT / σ(F): 0 / Stereochemistry target values: Engh & Huber
RfactorNum. reflection% reflectionSelection details
Rfree0.24 3561 5 %RANDOM
Rwork0.208 ---
obs0.208 71157 93.1 %-
Solvent computationSolvent model: FLAT MODEL / Bsol: 53.0244 Å2 / ksol: 0.388795 e/Å3
Displacement parametersBiso mean: 36.3 Å2
Baniso -1Baniso -2Baniso -3
1-7.59 Å20 Å20 Å2
2--0.04 Å20 Å2
3----7.63 Å2
Refine analyze
FreeObs
Luzzati coordinate error0.28 Å0.24 Å
Luzzati d res low-5 Å
Luzzati sigma a0.29 Å0.27 Å
Refinement stepCycle: LAST / Resolution: 1.9→34.96 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms6593 0 146 608 7347
Refine LS restraints
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONc_bond_d0.006
X-RAY DIFFRACTIONc_bond_d_na
X-RAY DIFFRACTIONc_bond_d_prot
X-RAY DIFFRACTIONc_angle_d
X-RAY DIFFRACTIONc_angle_d_na
X-RAY DIFFRACTIONc_angle_d_prot
X-RAY DIFFRACTIONc_angle_deg1.3
X-RAY DIFFRACTIONc_angle_deg_na
X-RAY DIFFRACTIONc_angle_deg_prot
X-RAY DIFFRACTIONc_dihedral_angle_d22.4
X-RAY DIFFRACTIONc_dihedral_angle_d_na
X-RAY DIFFRACTIONc_dihedral_angle_d_prot
X-RAY DIFFRACTIONc_improper_angle_d0.91
X-RAY DIFFRACTIONc_improper_angle_d_na
X-RAY DIFFRACTIONc_improper_angle_d_prot
X-RAY DIFFRACTIONc_mcbond_it
X-RAY DIFFRACTIONc_mcangle_it
X-RAY DIFFRACTIONc_scbond_it
X-RAY DIFFRACTIONc_scangle_it
LS refinement shellResolution: 1.9→1.97 Å / Rfactor Rfree error: 0.02 / Total num. of bins used: 10
RfactorNum. reflection% reflection
Rfree0.36 333 5 %
Rwork0.331 6324 -
obs--88.3 %
Xplor file
Refine-IDSerial noParam fileTopol file
X-RAY DIFFRACTION1protein_rep.paramprotein.top
X-RAY DIFFRACTION2water_rep.paramwater.top
X-RAY DIFFRACTION3hetero2.parhetero2.top

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