3GGO

Crystal structure of prephenate dehydrogenase from A. aeolicus with HPP and NADH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The Crystal Structure of Aquifex aeolicus Prephenate Dehydrogenase Reveals the Mode of Tyrosine Inhibition.

Sun, W.Shahinas, D.Bonvin, J.Hou, W.Kimber, M.S.Turnbull, J.Christendat, D.

(2009) J Biol Chem 284: 13223-13232

  • DOI: 10.1074/jbc.M806272200
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • TyrA proteins belong to a family of dehydrogenases that are dedicated to l-tyrosine biosynthesis. The three TyrA subclasses are distinguished by their substrate specificities, namely the prephenate dehydrogenases, the arogenate dehydrogenases, and th ...

    TyrA proteins belong to a family of dehydrogenases that are dedicated to l-tyrosine biosynthesis. The three TyrA subclasses are distinguished by their substrate specificities, namely the prephenate dehydrogenases, the arogenate dehydrogenases, and the cyclohexadienyl dehydrogenases, which utilize prephenate, l-arogenate, or both substrates, respectively. The molecular mechanism responsible for TyrA substrate selectivity and regulation is unknown. To further our understanding of TyrA-catalyzed reactions, we have determined the crystal structures of Aquifex aeolicus prephenate dehydrogenase bound with NAD(+) plus either 4-hydroxyphenylpyuvate, 4-hydroxyphenylpropionate, or l-tyrosine and have used these structures as guides to target active site residues for site-directed mutagenesis. From a combination of mutational and structural analyses, we have demonstrated that His-147 and Arg-250 are key catalytic and binding groups, respectively, and Ser-126 participates in both catalysis and substrate binding through the ligand 4-hydroxyl group. The crystal structure revealed that tyrosine, a known inhibitor, binds directly to the active site of the enzyme and not to an allosteric site. The most interesting finding though, is that mutating His-217 relieved the inhibitory effect of tyrosine on A. aeolicus prephenate dehydrogenase. The identification of a tyrosine-insensitive mutant provides a novel avenue for designing an unregulated enzyme for application in metabolic engineering.


    Organizational Affiliation

    Department of Cell and Systems Biology, University of Toronto, Ontario, Canada.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Prephenate dehydrogenase
A, B, C, D
314Aquifex aeolicusMutation(s): 0 
Gene Names: aq_1755tyrA
Find proteins for O67636 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O67636
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAI
Query on NAI

Download CCD File 
A, B, C, D
1,4-DIHYDRONICOTINAMIDE ADENINE DINUCLEOTIDE
C21 H29 N7 O14 P2
BOPGDPNILDQYTO-NNYOXOHSSA-N
 Ligand Interaction
ENO
Query on ENO

Download CCD File 
B, C
3-(4-HYDROXY-PHENYL)PYRUVIC ACID
C9 H8 O4
KKADPXVIOXHVKN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.219 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.496α = 90
b = 92.481β = 90
c = 164.083γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
AMoREphasing
REFMACrefinement
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-03-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance