4Z3K

Human sepiapterin reductase in complex with the cofactor NADP+ and the trypthophan metabolite xanthurenic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Tetrahydrobiopterin Biosynthesis as a Potential Target of the Kynurenine Pathway Metabolite Xanthurenic Acid.

Haruki, H.Hovius, R.Pedersen, M.G.Johnsson, K.

(2016) J Biol Chem 291: 652-657

  • DOI: https://doi.org/10.1074/jbc.C115.680488
  • Primary Citation of Related Structures:  
    4Z3K

  • PubMed Abstract: 

    Tryptophan metabolites in the kynurenine pathway are up-regulated by pro-inflammatory cytokines or glucocorticoids, and are linked to anti-inflammatory and immunosuppressive activities. In addition, they are up-regulated in pathologies such as cancer, autoimmune diseases, and psychiatric disorders. The molecular mechanisms of how kynurenine pathway metabolites cause these effects are incompletely understood. On the other hand, pro-inflammatory cytokines also up-regulate the amounts of tetrahydrobiopterin (BH4), an enzyme cofactor essential for the synthesis of several neurotransmitter and nitric oxide species. Here we show that xanthurenic acid is a potent inhibitor of sepiapterin reductase (SPR), the final enzyme in de novo BH4 synthesis. The crystal structure of xanthurenic acid bound to the active site of SPR reveals why among all kynurenine pathway metabolites xanthurenic acid is the most potent SPR inhibitor. Our findings suggest that increased xanthurenic acid levels resulting from up-regulation of the kynurenine pathway could attenuate BH4 biosynthesis and BH4-dependent enzymatic reactions, linking two major metabolic pathways known to be highly up-regulated in inflammation.


  • Organizational Affiliation

    From the Institute of Chemical Sciences and Engineering, Institute of Bioengineering, National Centre of Competence in Research (NCCR) in Chemical Biology, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sepiapterin reductase
A, B, C, D
275Homo sapiensMutation(s): 0 
Gene Names: SPR
EC: 1.1.1.153
UniProt & NIH Common Fund Data Resources
Find proteins for P35270 (Homo sapiens)
Explore P35270 
Go to UniProtKB:  P35270
PHAROS:  P35270
GTEx:  ENSG00000116096 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35270
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAP
Query on NAP

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B],
M [auth C],
Q [auth D]
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
4KL
Query on 4KL

Download Ideal Coordinates CCD File 
F [auth A],
I [auth B],
N [auth C],
R [auth D]
Xanthuric acid
C10 H7 N O4
FBZONXHGGPHHIY-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
G [auth A]
J [auth B]
K [auth B]
O [auth C]
P [auth C]
G [auth A],
J [auth B],
K [auth B],
O [auth C],
P [auth C],
S [auth D]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
EDO
Query on EDO

Download Ideal Coordinates CCD File 
L [auth B]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143.964α = 90
b = 143.964β = 90
c = 180.74γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2015-11-18 
  • Deposition Author(s): Johnsson, K.

Revision History  (Full details and data files)

  • Version 1.0: 2015-11-18
    Type: Initial release
  • Version 1.1: 2016-07-20
    Changes: Database references
  • Version 1.2: 2024-01-10
    Changes: Data collection, Database references, Refinement description