1ARZ

ESCHERICHIA COLI DIHYDRODIPICOLINATE REDUCTASE IN COMPLEX WITH NADH AND 2,6 PYRIDINE DICARBOXYLATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Three-dimensional structure of Escherichia coli dihydrodipicolinate reductase in complex with NADH and the inhibitor 2,6-pyridinedicarboxylate.

Scapin, G.Reddy, S.G.Zheng, R.Blanchard, J.S.

(1997) Biochemistry 36: 15081-15088

  • DOI: 10.1021/bi9719915

  • PubMed Abstract: 
  • Dihydrodipicolinate reductase catalyzes the NAD(P)H-dependent reduction of the alpha,beta-unsaturated cyclic imine dihydrodipicolinate to form the cyclic imine tetrahydrodipicolinate. The enzyme is a component of the biosynthetic pathway that leads t ...

    Dihydrodipicolinate reductase catalyzes the NAD(P)H-dependent reduction of the alpha,beta-unsaturated cyclic imine dihydrodipicolinate to form the cyclic imine tetrahydrodipicolinate. The enzyme is a component of the biosynthetic pathway that leads to diaminopimelate and lysine in bacteria and higher plants. Because these pathways are unique to microorganisms and plants, they may represent attractive targets for new antimicrobial or herbicidal compounds. The three-dimensional structure of the ternary complex of Escherichia coli dihydrodipicolinate reductase with NADH and the inhibitor 2,6-pyridinedicarboxylate has been solved using a combination of molecular replacement and noncrystallographic symmetry averaging procedures and refined against 2.6 A resolution data to a crystallographic R-factor of 21.4% (Rfree is 29.7%). The native enzyme is a 120 000 molecular weight tetramer of identical subunits. The refined crystallographic model contains a tetramer, three molecules of NADH, three molecules of inhibitor, one phosphate ion, and 186 water molecules per asymmetric unit. Each subunit consists of two domains connected by two flexible hinge regions. While three of the four subunits of the tetramer have a closed conformation, in which the nicotinamide ring of the cofactor bound to the N-terminal domain and the reducible carbon of the substrate bound to the substrate binding domain are about 3.5 A away, the fourth subunit is unliganded and shows an open conformation, suggesting that the enzyme undergoes a major conformational change upon binding of both substrates. The residues involved in binding of the inhibitor and the residues involved in catalysis have been identified on the basis of the three-dimensional structure. Site-directed mutants have been used to further characterize the role of these residues in binding and catalysis. A chemical mechanism for the enzyme, based on these and previously reported data, is proposed.


    Related Citations: 
    • Three-Dimensional Structure of Escherichia Coli Dihydrodipicolinate Reductase
      Scapin, G.,Blanchard, J.S.,Sacchettini, J.C.
      (1995) Biochemistry 34: 3502
    • Expression, Purification, and Characterization of Escherichia Coli Dihydrodipicolinate Reductase
      Reddy, S.G.,Sacchettini, J.C.,Blanchard, J.S.
      (1995) Biochemistry 34: 3492


    Organizational Affiliation

    Biochemistry Department, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10469, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DIHYDRODIPICOLINATE REDUCTASE
A, B, C, D
273Escherichia coli (strain K12)Gene Names: dapB
EC: 1.17.1.8
Find proteins for P04036 (Escherichia coli (strain K12))
Go to UniProtKB:  P04036
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

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

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Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
NAI
Query on NAI

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

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Download CCD File 
B, C, D
PYRIDINE-2,6-DICARBOXYLIC ACID
DIPICOLINIC ACID
C7 H5 N O4
WJJMNDUMQPNECX-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.214 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 137.600α = 90.00
b = 123.800β = 90.00
c = 66.600γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
XENGENdata scaling
XENGENdata reduction
X-PLORmodel building
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-10-14
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance
  • Version 1.3: 2013-10-30
    Type: Non-polymer description