1WPL

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.207 

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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
  • Primary Citation of Related Structures:  
    1WPL

  • 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 serotonin ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GTP cyclohydrolase I
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J
230Rattus norvegicusMutation(s): 0 
Gene Names: Gch1Gch
EC: 3.5.4.16
UniProt
Find proteins for P22288 (Rattus norvegicus)
Explore P22288 
Go to UniProtKB:  P22288
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
GTP cyclohydrolase I feedback regulatory protein
K, L, M, N, O, P, Q, R
K, L, M, N, O, P, Q, R, S, T
84Rattus norvegicusMutation(s): 0 
Gene Names: GchfrGfrp
UniProt
Find proteins for P70552 (Rattus norvegicus)
Explore P70552 
Go to UniProtKB:  P70552
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3PO (Subject of Investigation/LOI)
Query on 3PO

Download Ideal Coordinates CCD File 
AA [auth B] , DA [auth C] , GA [auth D] , IA [auth E] , MA [auth F] , PA [auth G] , SA [auth H] , VA [auth I] , 
AA [auth B], DA [auth C], GA [auth D], IA [auth E], MA [auth F], PA [auth G], SA [auth H], VA [auth I], X [auth A], XA [auth J]
TRIPHOSPHATE
H5 O10 P3
UNXRWKVEANCORM-UHFFFAOYSA-N
 Ligand Interaction
HBI (Subject of Investigation/LOI)
Query on HBI

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CA [auth C] , FA [auth D] , KA [auth F] , LA [auth F] , OA [auth G] , RA [auth H] , UA [auth I] , V [auth A] , 
CA [auth C], FA [auth D], KA [auth F], LA [auth F], OA [auth G], RA [auth H], UA [auth I], V [auth A], W [auth A], Z [auth B]
7,8-DIHYDROBIOPTERIN
C9 H13 N5 O3
FEMXZDUTFRTWPE-DZSWIPIPSA-N
 Ligand Interaction
ZN
Query on ZN

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BA [auth C] , EA [auth D] , HA [auth E] , JA [auth F] , NA [auth G] , QA [auth H] , TA [auth I] , U [auth A] , 
BA [auth C], EA [auth D], HA [auth E], JA [auth F], NA [auth G], QA [auth H], TA [auth I], U [auth A], WA [auth J], Y [auth B]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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AB [auth M] , BB [auth N] , CB [auth O] , DB [auth P] , EB [auth Q] , FB [auth R] , GB [auth S] , HB [auth T] , 
AB [auth M], BB [auth N], CB [auth O], DB [auth P], EB [auth Q], FB [auth R], GB [auth S], HB [auth T], YA [auth K], ZA [auth L]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.207 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 121.72α = 90
b = 109.67β = 97.85
c = 130.27γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing
CNSrefinement
CCP4data scaling

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

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