1DRU

ESCHERICHIA COLI DHPR/NADH COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Interaction of pyridine nucleotide substrates with Escherichia coli dihydrodipicolinate reductase: thermodynamic and structural analysis of binary complexes.

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

(1996) Biochemistry 35: 13294-13302

  • DOI: 10.1021/bi9615809
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • E. coli dihydrodipicolinate reductase exhibits unusual nucleotide specificity, with NADH being kinetically twice as effective as NADPH as a reductant as evidenced by their relative V/K values. To investigate the nature of the interactions which deter ...

    E. coli dihydrodipicolinate reductase exhibits unusual nucleotide specificity, with NADH being kinetically twice as effective as NADPH as a reductant as evidenced by their relative V/K values. To investigate the nature of the interactions which determine this specificity, we performed isothermal titration calorimetry to determine the thermodynamic parameters of binding and determined the three-dimensional structures of the corresponding enzyme-nucleotide complexes. The thermodynamic binding parameters for NADPH and NADH were determined to be Kd = 2.12 microM, delta G degree = -7.81 kcal mol-1, delta H degree = -10.98 kcal mol-1, and delta S degree = -10.5 cal mol-1 deg-1 and Kd = 0.46 microM, delta G degree = -8.74 kcal mol-1, delta H degree = -8.93 kcal mol-1, and delta S degree = 0.65 cal mol-1 deg-1, respectively. The structures of DHPR complexed with these nucleotides have been determined at 2.2 A resolution. The 2'-phosphate of NADPH interacts electrostatically with Arg39, while in the NADH complex this interaction is replaced by hydrogen bonds between the 2' and 3' adenosyl ribose hydroxyls and Glu38. Similar studies were also performed with other pyridine nucleotide substrate analogs to determine the contributions of individual groups on the nucleotide to the binding affinity and enthalpic and entropic components of the free energy of binding, delta G degree. Analogs lacking the 2'-phosphate containing homologs. For all analogs, the total binding free energy can be shown to include compensating enthalpic and entropic contributions to the association constants. The entropy contribution appears to play a more important role in the binding of the nonphosphorylated analogs than in the binding of the phosphorylated analogs.


    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

    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
DIHYDRODIPICOLINATE REDUCTASE
A
273Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: dapB
EC: 1.17.1.8
Find proteins for P04036 (Escherichia coli (strain K12))
Go to UniProtKB:  P04036
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

Download SDF File 
Download CCD File 
A
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
NADKd: 460 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 81.200α = 90.00
b = 84.500β = 90.00
c = 91.900γ = 90.00
Software Package:
Software NamePurpose
XENGENdata scaling
XENGENdata reduction
TNTrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-01-27
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance