4NOS | pdb_00004nos

HUMAN INDUCIBLE NITRIC OXIDE SYNTHASE WITH INHIBITOR

PDB DOI: https://doi.org/10.2210/pdb4NOS/pdb

Classification: OXIDOREDUCTASE
Organism(s): Homo sapiens
Expression System: Escherichia coli
Mutation(s): No

Deposited: 1999-02-03 Released: 2000-02-04
Deposition Author(s): Fischmann, T.O., Weber, P.C.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.25 Å
R-Value Free:
0.289 (Depositor)
R-Value Work:
0.199 (Depositor)

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history.

Literature

Structural characterization of nitric oxide synthase isoforms reveals striking active-site conservation.

Fischmann, T.O., Hruza, A., Niu, X.D., Fossetta, J.D., Lunn, C.A., Dolphin, E., Prongay, A.J., Reichert, P., Lundell, D.J., Narula, S.K., Weber, P.C.

(1999) Nat Struct Biol 6: 233-242

PubMed: 10074942 Search on PubMed
DOI: https://doi.org/10.1038/6675
Primary Citation Related Structures:
3NOS, 4NOS

PubMed Abstract:
Crystal structures of human endothelial nitric oxide synthase (eNOS) and human inducible NOS (iNOS) catalytic domains were solved in complex with the arginine substrate and an inhibitor S-ethylisothiourea (SEITU), respectively. The small molecules bind in a narrow cleft within the larger active-site cavity containing heme and tetrahydrobiopterin. Both are hydrogen-bonded to a conserved glutamate (eNOS E361, iNOS E377). The active-site residues of iNOS and eNOS are nearly identical. Nevertheless, structural comparisons provide a basis for design of isozyme-selective inhibitors. The high-resolution, refined structures of eNOS (2.4 A resolution) and iNOS (2.25 A resolution) reveal an unexpected structural zinc situated at the intermolecular interface and coordinated by four cysteines, two from each monomer.

Organizational Affiliation

Structural Chemistry Department, Schering-Plough Research Institute, Kenilworth, New Jersey 07033, USA. thierry.fischmann@spcorp.com

Macromolecule Content

Total Structure Weight: 201.82 kDa
Atom Count: 15,317
Modeled Residue Count: 1,684
Deposited Residue Count: 1,708
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
INDUCIBLE NITRIC OXIDE SYNTHASE	A, B, C, D	427	Homo sapiens	Mutation(s): 0 EC: 1.14.13.39
UniProt & NIH Common Fund Data Resources
Find proteins for P35228 (Homo sapiens) Explore P35228 Go to UniProtKB: P35228
PHAROS: P35228 GTEx: ENSG00000007171
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P35228
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
HEM Query on HEM Download:Ideal Coordinates CCD File SDF format, chain F [auth A] SDF format, chain I [auth B] SDF format, chain P [auth D] SDF format, chain M [auth C] MOL2 format, chain F [auth A] MOL2 format, chain I [auth B] MOL2 format, chain P [auth D] MOL2 format, chain M [auth C] mmCIF format, chain F [auth A] mmCIF format, chain I [auth B] mmCIF format, chain P [auth D] mmCIF format, chain M [auth C]	F [auth A], I [auth B], M [auth C], P [auth D]	PROTOPORPHYRIN IX CONTAINING FE C₃₄ H₃₂ Fe N₄ O₄ KABFMIBPWCXCRK-RGGAHWMASA-L		Interactions Focus chain F [auth A] Focus chain I [auth B] Focus chain M [auth C] Focus chain P [auth D]
H4B Query on H4B Download:Ideal Coordinates CCD File SDF format, chain J [auth B] SDF format, chain N [auth C] SDF format, chain Q [auth D] MOL2 format, chain J [auth B] MOL2 format, chain N [auth C] MOL2 format, chain Q [auth D] mmCIF format, chain J [auth B] mmCIF format, chain N [auth C] mmCIF format, chain Q [auth D]	J [auth B], N [auth C], Q [auth D]	5,6,7,8-TETRAHYDROBIOPTERIN C₉ H₁₅ N₅ O₃ FNKQXYHWGSIFBK-RPDRRWSUSA-N		Interactions Focus chain J [auth B] Focus chain N [auth C] Focus chain Q [auth D]
H2B Query on H2B Download:Ideal Coordinates CCD File SDF format, chain G [auth A] MOL2 format, chain G [auth A] mmCIF format, chain G [auth A]	G [auth A]	2-AMINO-6-(1,2-DIHYDROXY-PROPYL)-7,8-DIHYDRO-6H-PTERIDIN-4-ONE C₉ H₁₃ N₅ O₃ ZHQJVZLJDXWFFX-RPDRRWSUSA-N		Interactions Focus chain G [auth A]
ITU Query on ITU Download:Ideal Coordinates CCD File SDF format, chain H [auth A] SDF format, chain K [auth B] SDF format, chain O [auth C] SDF format, chain R [auth D] MOL2 format, chain H [auth A] MOL2 format, chain K [auth B] MOL2 format, chain O [auth C] MOL2 format, chain R [auth D] mmCIF format, chain H [auth A] mmCIF format, chain K [auth B] mmCIF format, chain O [auth C] mmCIF format, chain R [auth D]	H [auth A], K [auth B], O [auth C], R [auth D]	ETHYLISOTHIOUREA C₃ H₈ N₂ S VFIZBHJTOHUOEK-UHFFFAOYSA-N		Interactions Focus chain H [auth A] Focus chain K [auth B] Focus chain O [auth C] Focus chain R [auth D]
ZN Query on ZN Download:Ideal Coordinates CCD File SDF format, chain E [auth A] SDF format, chain L [auth C] MOL2 format, chain E [auth A] MOL2 format, chain L [auth C] mmCIF format, chain E [auth A] mmCIF format, chain L [auth C]	E [auth A], L [auth C]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N		Interactions Focus chain E [auth A] Focus chain L [auth C]

Binding Affinity Annotations
ID	Source	Binding Affinity
ITU	BindingDB: 4NOS	Ki: min: 5.2, max: 190 (nM) from 2 assay(s)
ITU	BindingDB: 4NOS	IC50: 160 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 2.25 Å
R-Value Free: 0.289 (Depositor)
R-Value Work: 0.199 (Depositor)

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 89.759	α = 90
b = 156.672	β = 90
c = 190.044	γ = 90

Software Package:

Software Name	Purpose
SHARP	phasing
SOLOMON	phasing
X-PLOR	refinement
DENZO	data reduction
CCP4	data scaling

Structure Validation

View Full Validation Report

View more in-depth experimental data

Entry History

Deposition Data

Released Date: 2000-02-04

Deposition Author(s):

Fischmann, T.O.

Weber, P.C.

Revision History (Full details and data files)

Version 1.0: 2000-02-04
Type: Initial release
Version 1.1: 2007-10-16
Changes: Version format compliance
Version 1.2: 2011-07-13
Changes: Derived calculations, Version format compliance
Version 1.3: 2023-12-27
Changes: Data collection, Database references, Derived calculations