Crystal structure of chorismate mutase / prephenate dehydrogenase (tyrA) (1574749) from Haemophilus influenzae RD at 2.00 A resolution

Experimental Data Snapshot

  • Resolution: 2 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.161 

wwPDB Validation 3D Report Full Report

This is version 1.4 of the entry. See complete history


The structure of Haemophilus influenzae prephenate dehydrogenase suggests unique features of bifunctional TyrA enzymes.

Chiu, H.J.Abdubek, P.Astakhova, T.Axelrod, H.L.Carlton, D.Clayton, T.Das, D.Deller, M.C.Duan, L.Feuerhelm, J.Grant, J.C.Grzechnik, A.Han, G.W.Jaroszewski, L.Jin, K.K.Klock, H.E.Knuth, M.W.Kozbial, P.Krishna, S.S.Kumar, A.Marciano, D.McMullan, D.Miller, M.D.Morse, A.T.Nigoghossian, E.Okach, L.Reyes, R.Tien, H.J.Trame, C.B.van den Bedem, H.Weekes, D.Xu, Q.Hodgson, K.O.Wooley, J.Elsliger, M.A.Deacon, A.M.Godzik, A.Lesley, S.A.Wilson, I.A.

(2010) Acta Crystallogr.,Sect.F 66: 1317-1325

  • DOI: 10.1107/S1744309110021688

  • PubMed Abstract: 
  • Chorismate mutase/prephenate dehydrogenase from Haemophilus influenzae Rd KW20 is a bifunctional enzyme that catalyzes the rearrangement of chorismate to prephenate and the NAD(P)(+)-dependent oxidative decarboxylation of prephenate to 4-hydroxypheny ...

    Chorismate mutase/prephenate dehydrogenase from Haemophilus influenzae Rd KW20 is a bifunctional enzyme that catalyzes the rearrangement of chorismate to prephenate and the NAD(P)(+)-dependent oxidative decarboxylation of prephenate to 4-hydroxyphenylpyruvate in tyrosine biosynthesis. The crystal structure of the prephenate dehydrogenase component (HinfPDH) of the TyrA protein from H. influenzae Rd KW20 in complex with the inhibitor tyrosine and cofactor NAD(+) has been determined to 2.0 Å resolution. HinfPDH is a dimeric enzyme, with each monomer consisting of an N-terminal α/β dinucleotide-binding domain and a C-terminal α-helical dimerization domain. The structure reveals key active-site residues at the domain interface, including His200, Arg297 and Ser179 that are involved in catalysis and/or ligand binding and are highly conserved in TyrA proteins from all three kingdoms of life. Tyrosine is bound directly at the catalytic site, suggesting that it is a competitive inhibitor of HinfPDH. Comparisons with its structural homologues reveal important differences around the active site, including the absence of an α-β motif in HinfPDH that is present in other TyrA proteins, such as Synechocystis sp. arogenate dehydrogenase. Residues from this motif are involved in discrimination between NADP(+) and NAD(+). The loop between β5 and β6 in the N-terminal domain is much shorter in HinfPDH and an extra helix is present at the C-terminus. Furthermore, HinfPDH adopts a more closed conformation compared with TyrA proteins that do not have tyrosine bound. This conformational change brings the substrate, cofactor and active-site residues into close proximity for catalysis. An ionic network consisting of Arg297 (a key residue for tyrosine binding), a water molecule, Asp206 (from the loop between β5 and β6) and Arg365' (from the additional C-terminal helix of the adjacent monomer) is observed that might be involved in gating the active site.

    Organizational Affiliation

    Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.


Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
T-protein [Includes: Chorismate mutase (EC (CM) and Prephenate dehydrogenase (EC (PDH)]
A, B
298Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)Mutation(s): 0 
Gene Names: tyrA
Find proteins for P43902 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd))
Go to UniProtKB:  P43902
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Query on TYR

Download SDF File 
Download CCD File 
A, B
C9 H11 N O3
 Ligand Interaction
Query on NAD

Download SDF File 
Download CCD File 
A, B
C21 H27 N7 O14 P2
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

Unit Cell:
Length (Å)Angle (°)
a = 127.790α = 90.00
b = 127.790β = 90.00
c = 100.620γ = 90.00
Software Package:
Software NamePurpose
MolProbitymodel building
MAR345data collection
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-05-22
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description
  • Version 1.4: 2017-10-25
    Type: Author supporting evidence