1TJ2

Crystal structure of E. coli PutA proline dehydrogenase domain (residues 86-669) complexed with acetate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

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This is version 1.2 of the entry. See complete history


Literature

Structures of the Escherichia coli PutA proline dehydrogenase domain in complex with competitive inhibitors

Zhang, M.White, T.A.Schuermann, J.P.Baban, B.A.Becker, D.F.Tanner, J.J.

(2004) Biochemistry 43: 12539-12548

  • DOI: 10.1021/bi048737e
  • Primary Citation of Related Structures:  
    1TIW, 1TJ0, 1TJ1, 1TJ2

  • PubMed Abstract: 
  • Proline dehydrogenase (PRODH) catalyzes the first step of proline catabolism, the flavin-dependent oxidation of proline to Delta(1)-pyrroline-5-carboxylate. Here we present a structure-based study of the PRODH active site of the multifunctional Escherichia coli proline utilization A (PutA) protein using X-ray crystallography, enzyme kinetic measurements, and site-directed mutagenesis ...

    Proline dehydrogenase (PRODH) catalyzes the first step of proline catabolism, the flavin-dependent oxidation of proline to Delta(1)-pyrroline-5-carboxylate. Here we present a structure-based study of the PRODH active site of the multifunctional Escherichia coli proline utilization A (PutA) protein using X-ray crystallography, enzyme kinetic measurements, and site-directed mutagenesis. Structures of the PutA PRODH domain complexed with competitive inhibitors acetate (K(i) = 30 mM), L-lactate (K(i) = 1 mM), and L-tetrahydro-2-furoic acid (L-THFA, K(i) = 0.2 mM) have been determined to high-resolution limits of 2.1-2.0 A. The discovery of acetate as a competitive inhibitor suggests that the carboxyl is the minimum functional group recognized by the active site, and the structures show how the enzyme exploits hydrogen-bonding and nonpolar interactions to optimize affinity for the substrate. The PRODH/L-THFA complex is the first structure of PRODH with a five-membered ring proline analogue bound in the active site and thus provides new insights into substrate recognition and the catalytic mechanism. The ring of L-THFA is nearly parallel to the middle ring of the FAD isoalloxazine, with the inhibitor C5 atom 3.3 A from the FAD N5. This geometry suggests direct hydride transfer as a plausible mechanism. Mutation of conserved active site residue Leu432 to Pro caused a 5-fold decrease in k(cat) and a severe loss in thermostability. These changes are consistent with the location of Leu432 in the hydrophobic core near residues that directly contact FAD. Our results suggest that the molecular basis for increased plasma proline levels in schizophrenic subjects carrying the missense mutation L441P is due to decreased stability of human PRODH2.


    Related Citations: 
    • Detection of L-lactate in polyethylene glycol solutions confirms the identity of the active-site ligand in a proline dehydrogenase structure
      Zhang, M., Tanner, J.J.
      (2004) Acta Crystallogr D Biol Crystallogr 60: 985

    Organizational Affiliation

    Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bifunctional putA proteinA584Escherichia coliMutation(s): 0 
Gene Names: putApoaAb1014
EC: 1.5.99.8 (PDB Primary Data), 1.5.5.2 (UniProt), 1.2.1.88 (UniProt)
UniProt
Find proteins for P09546 (Escherichia coli (strain K12))
Explore P09546 
Go to UniProtKB:  P09546
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD (Subject of Investigation/LOI)
Query on FAD

Download Ideal Coordinates CCD File 
C [auth A]FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
B [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
ACT Binding MOAD:  1TJ2 Ki: 3.00e+7 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.855α = 90
b = 141.093β = 90
c = 145.428γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-10-26
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Derived calculations, Version format compliance