1NAS

SEPIAPTERIN REDUCTASE COMPLEXED WITH N-ACETYL SEROTONIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.166 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The 1.25 A crystal structure of sepiapterin reductase reveals its binding mode to pterins and brain neurotransmitters.

Auerbach, G.Herrmann, A.Gutlich, M.Fischer, M.Jacob, U.Bacher, A.Huber, R.

(1997) EMBO J 16: 7219-7230

  • DOI: https://doi.org/10.1093/emboj/16.24.7219
  • Primary Citation of Related Structures:  
    1NAS, 1OAA, 1SEP

  • PubMed Abstract: 

    Sepiapterin reductase catalyses the last steps in the biosynthesis of tetrahydrobiopterin, the essential co-factor of aromatic amino acid hydroxylases and nitric oxide synthases. We have determined the crystal structure of mouse sepiapterin reductase by multiple isomorphous replacement at a resolution of 1.25 A in its ternary complex with oxaloacetate and NADP. The homodimeric structure reveals a single-domain alpha/beta-fold with a central four-helix bundle connecting two seven-stranded parallel beta-sheets, each sandwiched between two arrays of three helices. Ternary complexes with the substrate sepiapterin or the product tetrahydrobiopterin were studied. Each subunit contains a specific aspartate anchor (Asp258) for pterin-substrates, which positions the substrate side chain C1'-carbonyl group near Tyr171 OH and NADP C4'N. The catalytic mechanism of SR appears to consist of a NADPH-dependent proton transfer from Tyr171 to the substrate C1' and C2' carbonyl functions accompanied by stereospecific side chain isomerization. Complex structures with the inhibitor N-acetyl serotonin show the indoleamine bound such that both reductase and isomerase activity for pterins is inhibited, but reaction with a variety of carbonyl compounds is possible. The complex structure with N-acetyl serotonin suggests the possibility for a highly specific feedback regulatory mechanism between the formation of indoleamines and pteridines in vivo.


  • Organizational Affiliation

    Max-Planck-Institut für Biochemie, Abt. Strukturforschung, Am Klopferspitz 18a, D-82152 Martinsried, Germany. auerbach@biochem.mpg.de


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SEPIAPTERIN REDUCTASE259Mus musculusMutation(s): 0 
EC: 1.1.1.153
UniProt & NIH Common Fund Data Resources
Find proteins for Q64105 (Mus musculus)
Explore Q64105 
Go to UniProtKB:  Q64105
IMPC:  MGI:103078
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ64105
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAP
Query on NAP

Download Ideal Coordinates CCD File 
C [auth A]NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
ASE
Query on ASE

Download Ideal Coordinates CCD File 
D [auth A]N-ACETYL SEROTONIN
C12 H14 N2 O2
MVAWJSIDNICKHF-UHFFFAOYSA-N
OAA
Query on OAA

Download Ideal Coordinates CCD File 
B [auth A]OXALOACETATE ION
C4 H3 O5
KHPXUQMNIQBQEV-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.166 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.96α = 90
b = 116.96β = 90
c = 105.21γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-03-30
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations, Other