1E7M

ACTIVE SITE MUTANT (D177->N) OF GLUCOSE 6-PHOSPHATE DEHYDROGENASE FROM LEUCONOSTOC MESENTEROIDES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 

wwPDB Validation   3D Report Full Report


This is version 1.6 of the entry. See complete history


Literature

An Examination of the Role of Asp-177 in the His-Asp Catalytic Dyad of Leuconostoc Mesenteroides Glucose 6-Phosphate Dehydrogenase: X-Ray Structure and Ph Dependence of Kinetic Parameters of the D177N Mutant Enzyme

Cosgrove, M.S.Gover, S.Naylor, C.E.Vandeputte-Rutten, L.Adams, M.J.Levy, H.R.

(2000) Biochemistry 39: 15002

  • DOI: 10.1021/bi0014608
  • Primary Citation of Related Structures:  
    1E77, 1E7M, 1E7Y

  • PubMed Abstract: 
  • The role of Asp-177 in the His-Asp catalytic dyad of glucose 6-phosphate dehydrogenase from Leuconostoc mesenteroides has been investigated by a structural and functional characterization of the D177N mutant enzyme. Its three-dimensional structure has been determined by X-ray cryocrystallography in the presence of NAD(+) and in the presence of glucose 6-phosphate plus NADPH ...

    The role of Asp-177 in the His-Asp catalytic dyad of glucose 6-phosphate dehydrogenase from Leuconostoc mesenteroides has been investigated by a structural and functional characterization of the D177N mutant enzyme. Its three-dimensional structure has been determined by X-ray cryocrystallography in the presence of NAD(+) and in the presence of glucose 6-phosphate plus NADPH. The structure of a glucose 6-phosphate complex of a mutant (Q365C) with normal enzyme activity has also been determined and substrate binding compared. To understand the effect of Asp-177 on the ionization properties of the catalytic base His-240, the pH dependence of kinetic parameters has been determined for the D177N mutant and compared to that of the wild-type enzyme. The structures give details of glucose 6-phosphate binding and show that replacement of the Asp-177 of the catalytic dyad with asparagine does not affect the overall structure of glucose 6-phosphate dehydrogenase. Additionally, the evidence suggests that the productive tautomer of His-240 in the D177N mutant enzyme is stabilized by a hydrogen bond with Asn-177; hence, the mutation does not affect tautomer stabilization. We conclude, therefore, that the absence of a negatively charged aspartate at 177 accounts for the decrease in catalytic activity at pH 7.8. Structural analysis suggests that the pH dependence of the kinetic parameters of D177N glucose 6-phosphate dehydrogenase results from an ionized water molecule replacing the missing negative charge of the mutated Asp-177 at high pH. Glucose 6-phosphate binding orders and orients His-178 in the D177N-glucose 6-phosphate-NADPH ternary complex and appears to be necessary to form this water-binding site.


    Related Citations: 
    • The Three-Dimensional Structure of Glucose 6-Phosphate Dehydrogenase from Leuconostoc Mesenteroides Refined at 2 Angstroms Resolution
      Rowland, P., Basak, A.K., Gover, S., Levy, H.R., Adams, M.J.
      (1994) Structure 2: 1073
    • On the Mechanism of the Reaction Catalysed by Glucose 6-Phosphate Dehydrogenase
      Cosgrove, M.S., Naylor, C., Paludin, S., Adams, M.J., Levy, H.R.
      (1998) Biochemistry 37: 2759

    Organizational Affiliation

    Department of Biology, Syracuse University, Syracuse, New York 13244, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GLUCOSE 6-PHOSPHATE 1-DEHYDROGENASEA485Leuconostoc mesenteroidesMutation(s): 1 
Gene Names: PLMZ/D177Nzwf
EC: 1.1.1.49 (PDB Primary Data), 1.1.1.363 (UniProt)
UniProt
Find proteins for P11411 (Leuconostoc mesenteroides)
Explore P11411 
Go to UniProtKB:  P11411
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
B [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.3α = 90
b = 44.4β = 106.7
c = 92.8γ = 90
Software Package:
Software NamePurpose
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-12-11
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-07-05
    Changes: Data collection
  • Version 1.4: 2018-10-24
    Changes: Data collection, Source and taxonomy
  • Version 1.5: 2019-05-08
    Changes: Data collection, Experimental preparation
  • Version 1.6: 2019-05-22
    Changes: Data collection, Refinement description