1WPL

Crystal structure of the inhibitory form of rat GTP cyclohydrolase I/GFRP complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of biopterin-induced inhibition of GTP cyclohydrolase I by GFRP, its feedback regulatory protein

Maita, N.Hatakeyama, K.Okada, K.Hakoshima, T.

(2004) J.Biol.Chem. 279: 51534-51540

  • DOI: 10.1074/jbc.M409440200

  • PubMed Abstract: 
  • GTP cyclohydrolase I (GTPCHI) is the rate-limiting enzyme involved in the biosynthesis of tetrahydrobiopterin, a key cofactor necessary for nitric oxide synthase and for the hydroxylases that are involved in the production of catecholamines and serot ...

    GTP cyclohydrolase I (GTPCHI) is the rate-limiting enzyme involved in the biosynthesis of tetrahydrobiopterin, a key cofactor necessary for nitric oxide synthase and for the hydroxylases that are involved in the production of catecholamines and serotonin. In animals, the GTPCHI feedback regulatory protein (GFRP) binds GTPCHI to mediate feed-forward activation of GTPCHI activity in the presence of phenylalanine, whereas it induces feedback inhibition of enzyme activity in the presence of biopterin. Here, we have reported the crystal structure of the biopterin-induced inhibitory complex of GTPCHI and GFRP and compared it with the previously reported phenylalanine-induced stimulatory complex. The structure reveals five biopterin molecules located at each interface between GTPCHI and GFRP. Induced fitting structural changes by the biopterin binding expand large conformational changes in GTPCHI peptide segments forming the active site, resulting in inhibition of the activity. By locating 3,4-dihydroxy-phenylalanine-responsive dystonia mutations in the complex structure, we found mutations that may possibly disturb the GFRP-mediated regulation of GTPCHI.


    Organizational Affiliation

    Structural Biology Laboratory, Nara Institute of Science and Technology, CREST, Japan Science and Technology Agency, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GTP cyclohydrolase I
A, B, C, D, E, F, G, H, I, J
230Rattus norvegicusMutation(s): 0 
Gene Names: Gch1 (Gch)
EC: 3.5.4.16
Find proteins for P22288 (Rattus norvegicus)
Go to UniProtKB:  P22288
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
GTP cyclohydrolase I feedback regulatory protein
K, L, M, N, O, P, Q, R, S, T
84Rattus norvegicusMutation(s): 0 
Gene Names: Gchfr (Gfrp)
Find proteins for P70552 (Rattus norvegicus)
Go to UniProtKB:  P70552
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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Download CCD File 
K, L, M, N, O, P, Q, R, S, T
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
3PO
Query on 3PO

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Download CCD File 
A, B, C, D, E, F, G, H, I, J
TRIPHOSPHATE
H5 O10 P3
UNXRWKVEANCORM-UHFFFAOYSA-N
 Ligand Interaction
HBI
Query on HBI

Download SDF File 
Download CCD File 
A, B, C, D, F, G, H, I
7,8-DIHYDROBIOPTERIN
C9 H13 N5 O3
FEMXZDUTFRTWPE-DZSWIPIPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.207 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 121.720α = 90.00
b = 109.670β = 97.85
c = 130.270γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling
AMoREphasing
CNSrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-09-28
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance