4QOI

Crystal structure of FMN quinone reductase 2 in complex with melatonin at 1.55A

• PDB DOI: https://doi.org/10.2210/pdb4QOI/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2014-06-20 Released: 2015-07-01 
• Deposition Author(s): Serriere, J., Boutin, J.A., Isabet, T., Antoine, M., Ferry, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.197 
• R-Value Work: 0.177 
• R-Value Observed: 0.178 

Literature

Crystal structure of FMN quinone reductase 2 in complex with melatonin at 1.55A

Serriere, J., Boutin, J.A., Isabet, T., Antoine, M., Ferry, G.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 53.47 kDa 
• Atom Count: 4,232 
• Modelled Residue Count: 458 
• Deposited Residue Count: 462 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ribosyldihydronicotinamide dehydrogenase [quinone]	A, B	231	Homo sapiens	Mutation(s): 1  Gene Names: NQO2, NMOR2 EC: 1.10.99.2
UniProt & NIH Common Fund Data Resources
Find proteins for P16083 (Homo sapiens) Explore P16083  Go to UniProtKB:  P16083
PHAROS:  P16083 GTEx:  ENSG00000124588

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FMN	C [auth A], F [auth B]	FLAVIN MONONUCLEOTIDE C17 H21 N4 O9 P FVTCRASFADXXNN-SCRDCRAPSA-N
ML1	E [auth A], H [auth B]	N-[2-(5-methoxy-1H-indol-3-yl)ethyl]acetamide C13 H16 N2 O2 DRLFMBDRBRZALE-UHFFFAOYSA-N
ZN	D [auth A], G [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
ML1	BindingDB:  4QOI	Ki: min: 28, max: 57 (nM) from 2 assay(s)
		IC50: min: 64.57, max: 1.13e+4 (nM) from 4 assay(s)
		-TΔS: 9.96 (kJ/mol) from 1 assay(s)
		ΔG: -3.37e+1 (kJ/mol) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.197 
• R-Value Work: 0.177 
• R-Value Observed: 0.178 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 56.24	α = 90
b = 83.63	β = 90
c = 106.83	γ = 90

Software Package:

Software Name	Purpose
XDS	data scaling
MOLREP	phasing
BUSTER	refinement
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-07-01 
Deposition Author(s): Serriere, J., Boutin, J.A., Isabet, T., Antoine, M., Ferry, G.

Revision History  

• Version 1.0: 2015-07-01
  Type: Initial release
  
• Version 1.1: 2023-09-20
  Changes: Data collection, Database references, Derived calculations, Refinement description