2TOH

TYROSINE HYDROXYLASE CATALYTIC AND TETRAMERIZATION DOMAINS FROM RAT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of tyrosine hydroxylase with bound cofactor analogue and iron at 2.3 A resolution: self-hydroxylation of Phe300 and the pterin-binding site.

Goodwill, K.E.Sabatier, C.Stevens, R.C.

(1998) Biochemistry 37: 13437-13445

  • DOI: 10.1021/bi981462g

  • PubMed Abstract: 
  • TyrOH is a non-heme iron enzyme which uses molecular oxygen to hydroxylate tyrosine to form L-dihydroxyphenylalanine (L-DOPA), and tetrahydrobiopterin to form 4a-hydroxybiopterin, in the rate-limiting step of the catecholamine biosynthetic pathway. T ...

    TyrOH is a non-heme iron enzyme which uses molecular oxygen to hydroxylate tyrosine to form L-dihydroxyphenylalanine (L-DOPA), and tetrahydrobiopterin to form 4a-hydroxybiopterin, in the rate-limiting step of the catecholamine biosynthetic pathway. The 2.3 A crystal structure of the catalytic and tetramerization domains of rat tyrosine hydroxylase (TyrOH) in the presence of the cofactor analogue 7,8-dihydrobiopterin and iron shows the mode of pterin binding and the proximity of its hydroxylated 4a carbon to the required iron. The pterin binds on one face of the large active-site cleft, forming an aromatic pi-stacking interaction with Phe300. This phenylalanine residue of TyrOH is found to be hydroxylated in the meta position, most likely through an autocatalytic process, and to consequently form a hydrogen bond to the main-chain carbonyl of Gln310 which anchors Phe300 in the active site. The bound pterin forms hydrogen bonds from N-8 to the main-chain carbonyl of Leu295, from O-4 to Tyr371 and Glu376, from the C-1' OH to the main-chain amides of Leu294 and Leu295, and from the C-2' hydroxyl to an iron-coordinating water. The part of the pterin closest to the iron is the O-4 carbonyl oxygen at a distance of 3.6 A. The iron is 5.6 A from the pterin 4a carbon which is hydroxylated in the enzymatic reaction. No structural changes are observed between the pterin bound and the nonliganded enzyme. On the basis of these structures, molecular oxygen could bind in a bridging position optimally between the pterin C-4a and iron atom prior to substrate hydroxylation. This structure represents the first report of close interactions between pterin and iron in an enzyme active site.


    Organizational Affiliation

    Department of Chemistry, University of California, Berkeley, California 94720, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TYROSINE 3-MONOOXYGENASE
A
343Rattus norvegicusGene Names: Th
EC: 1.14.16.2
Find proteins for P04177 (Rattus norvegicus)
Go to UniProtKB:  P04177
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

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A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
FE
Query on FE

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Download CCD File 
A
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
HBI
Query on HBI

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Download CCD File 
A
7,8-DIHYDROBIOPTERIN
C9 H13 N5 O3
FEMXZDUTFRTWPE-DZSWIPIPSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MTY
Query on MTY
A
L-PEPTIDE LINKINGC9 H11 N O3TYR
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
HBIKi: 70000 nM BINDINGMOAD
HBIKi: 70000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.207 
  • Space Group: F 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 189.464α = 90.00
b = 148.595β = 90.00
c = 56.986γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
CNSphasing
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-08-26
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance