5BSH

Crystal structure of Medicago truncatula (delta)1-Pyrroline-5-Carboxylate Reductase (MtP5CR) in complex with L-Proline


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structure of Medicago truncatula delta (1)-pyrroline-5-carboxylate reductase provides new insights into regulation of proline biosynthesis in plants.

Ruszkowski, M.Nocek, B.Forlani, G.Dauter, Z.

(2015) Front Plant Sci 6: 869-869

  • DOI: 10.3389/fpls.2015.00869
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The two pathways for proline biosynthesis in higher plants share the last step, the conversion of δ(1)-pyrroline-5-carboxylate (P5C) to L-proline, which is catalyzed by P5C reductase (P5CR, EC 1.5.1.2) with the use of NAD(P)H as a coenzyme. There is ...

    The two pathways for proline biosynthesis in higher plants share the last step, the conversion of δ(1)-pyrroline-5-carboxylate (P5C) to L-proline, which is catalyzed by P5C reductase (P5CR, EC 1.5.1.2) with the use of NAD(P)H as a coenzyme. There is increasing amount of evidence to suggest a complex regulation of P5CR activity at the post-translational level, yet the molecular basis of these mechanisms is unknown. Here we report the three-dimensional structure of the P5CR enzyme from the model legume Medicago truncatula (Mt). The crystal structures of unliganded MtP5CR decamer, and its complexes with the products NAD(+), NADP(+), and L-proline were refined using x-ray diffraction data (at 1.7, 1.85, 1.95, and 2.1 Å resolution, respectively). Based on the presented structural data, the coenzyme preference for NADPH over NADH was explained, and NADPH is suggested to be the only coenzyme used by MtP5CR in vivo. Furthermore, the insensitivity of MtP5CR to feed-back inhibition by proline, revealed by enzymatic analysis, was correlated with structural features. Additionally, a mechanism for the modulation of enzyme activity by chloride anions is discussed, as well as the rationale for the possible development of effective enzyme inhibitors.


    Related Citations: 
    • Crystal structures of delta1-pyrroline-5-carboxylate reductase from human pathogens Neisseria meningitides and Streptococcus pyogenes.
      Nocek, B.,Chang, C.,Li, H.,Lezondra, L.,Holzle, D.,Collart, F.,Joachimiak, A.
      (2005) J. Mol. Biol. 354: 91
    • (delta)1-Pyrroline-5-carboxylate reductase from Arabidopsis thaliana: stimulation or inhibition by chloride ions and feedback regulation by proline depend on whether NADPH or NADH acts as co-substrate.
      Giberti, S.,Funck, D.,Forlani, G.
      (2014) New Phytol. 202: 911


    Organizational Affiliation

    Synchrotron Radiation Research Section, Macromolecular Crystallography Laboratory, National Cancer Institute Argonne, IL, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Pyrroline-5-carboxylate reductase
A, B, C, D, E, F, G, H, I, J
277Medicago truncatulaMutation(s): 0 
Gene Names: 11414041
EC: 1.5.1.2
Find proteins for G7KRM5 (Medicago truncatula)
Go to UniProtKB:  G7KRM5
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PRO
Query on PRO

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J
PROLINE
C5 H9 N O2
ONIBWKKTOPOVIA-BYPYZUCNSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.180 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 87.489α = 67.65
b = 100.928β = 85.46
c = 101.925γ = 89.44
Software Package:
Software NamePurpose
HKL-3000data reduction
REFMACrefinement
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-11-11
    Type: Initial release
  • Version 1.1: 2015-12-02
    Type: Database references