1C1X

L-PHENYLALANINE DEHYDROGENASE STRUCTURE IN TERNARY COMPLEX WITH NAD+ AND L-3-PHENYLLACTATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Rhodococcus L-phenylalanine dehydrogenase: kinetics, mechanism, and structural basis for catalytic specificity.

Brunhuber, N.M.Thoden, J.B.Blanchard, J.S.Vanhooke, J.L.

(2000) Biochemistry 39: 9174-9187

  • Primary Citation of Related Structures:  1C1D

  • PubMed Abstract: 
  • Phenylalanine dehydrogenase catalyzes the reversible, pyridine nucleotide-dependent oxidative deamination of L-phenylalanine to form phenylpyruvate and ammonia. We have characterized the steady-state kinetic behavior of the enzyme from Rhodococcus sp ...

    Phenylalanine dehydrogenase catalyzes the reversible, pyridine nucleotide-dependent oxidative deamination of L-phenylalanine to form phenylpyruvate and ammonia. We have characterized the steady-state kinetic behavior of the enzyme from Rhodococcus sp. M4 and determined the X-ray crystal structures of the recombinant enzyme in the complexes, E.NADH.L-phenylalanine and E.NAD(+). L-3-phenyllactate, to 1.25 and 1.4 A resolution, respectively. Initial velocity, product inhibition, and dead-end inhibition studies indicate the kinetic mechanism is ordered, with NAD(+) binding prior to phenylalanine and the products' being released in the order of ammonia, phenylpyruvate, and NADH. The enzyme shows no activity with NADPH or other 2'-phosphorylated pyridine nucleotides but has broad activity with NADH analogues. Our initial structural analyses of the E.NAD(+).phenylpyruvate and E.NAD(+). 3-phenylpropionate complexes established that Lys78 and Asp118 function as the catalytic residues in the active site [Vanhooke et al. (1999) Biochemistry 38, 2326-2339]. We have studied the ionization behavior of these residues in steady-state turnover and use these findings in conjunction with the structural data described both here and in our first report to modify our previously proposed mechanism for the enzymatic reaction. The structural characterizations also illuminate the mechanism of the redox specificity that precludes alpha-amino acid dehydrogenases from functioning as alpha-hydroxy acid dehydrogenases.


    Organizational Affiliation

    Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
L-PHENYLALANINE DEHYDROGENASE
A
355Rhodococcus spGene Names: pdh
EC: 1.4.1.20
Find proteins for Q59771 (Rhodococcus sp)
Go to UniProtKB:  Q59771
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (L-PHENYLALANINE DEHYDROGENASE)
B
355Rhodococcus spGene Names: pdh
EC: 1.4.1.20
Find proteins for Q59771 (Rhodococcus sp)
Go to UniProtKB:  Q59771
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

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Download CCD File 
A, B
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
PO4
Query on PO4

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B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
HFA
Query on HFA

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A, B
ALPHA-HYDROXY-BETA-PHENYL-PROPIONIC ACID
C9 H10 O3
VOXXWSYKYCBWHO-QMMMGPOBSA-N
 Ligand Interaction
NAD
Query on NAD

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Download CCD File 
A, B
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
IPA
Query on IPA

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Download CCD File 
B
ISOPROPYL ALCOHOL
2-PROPANOL
C3 H8 O
KFZMGEQAYNKOFK-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 64.600α = 90.00
b = 110.400β = 90.00
c = 113.400γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
TNTphasing
TNTrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-08-30
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance