5FII

Structure of a human aspartate kinase, chorismate mutase and TyrA domain.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Basis for Ligand-Dependent Dimerization of Phenylalanine Hydroxylase Regulatory Domain.

Patel, D.Kopec, J.Fitzpatrick, F.Mccorvie, T.J.Yue, W.W.

(2016) Sci.Rep. 6: 23748

  • DOI: 10.1038/srep23748

  • PubMed Abstract: 
  • The multi-domain enzyme phenylalanine hydroxylase (PAH) catalyzes the hydroxylation of dietary I-phenylalanine (Phe) to I-tyrosine. Inherited mutations that result in PAH enzyme deficiency are the genetic cause of the autosomal recessive disorder phe ...

    The multi-domain enzyme phenylalanine hydroxylase (PAH) catalyzes the hydroxylation of dietary I-phenylalanine (Phe) to I-tyrosine. Inherited mutations that result in PAH enzyme deficiency are the genetic cause of the autosomal recessive disorder phenylketonuria. Phe is the substrate for the PAH active site, but also an allosteric ligand that increases enzyme activity. Phe has been proposed to bind, in addition to the catalytic domain, a site at the PAH N-terminal regulatory domain (PAH-RD), to activate the enzyme via an unclear mechanism. Here we report the crystal structure of human PAH-RD bound with Phe at 1.8 Å resolution, revealing a homodimer of ACT folds with Phe bound at the dimer interface. This work delivers the structural evidence to support previous solution studies that a binding site exists in the RD for Phe, and that Phe binding results in dimerization of PAH-RD. Consistent with our structural observation, a disease-associated PAH mutant impaired in Phe binding disrupts the monomer:dimer equilibrium of PAH-RD. Our data therefore support an emerging model of PAH allosteric regulation, whereby Phe binds to PAH-RD and mediates the dimerization of regulatory modules that would bring about conformational changes to activate the enzyme.


    Organizational Affiliation

    Structural Genomics Consortium, Nuffield Department of Clinical Medicine, University of Oxford, UK OX3 7DQ.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHENYLALANINE-4-HYDROXYLASE
A, B, C, D
102Homo sapiensMutation(s): 0 
Gene Names: PAH
EC: 1.14.16.1
Find proteins for P00439 (Homo sapiens)
Go to Gene View: PAH
Go to UniProtKB:  P00439
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PHE
Query on PHE

Download SDF File 
Download CCD File 
A, B, C, D
PHENYLALANINE
C9 H11 N O2
COLNVLDHVKWLRT-QMMMGPOBSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.177 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 36.140α = 98.94
b = 37.410β = 103.84
c = 64.080γ = 94.79
Software Package:
Software NamePurpose
Rosettaphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-03-30
    Type: Initial release
  • Version 1.1: 2016-10-05
    Type: Database references