Reduced Precursor Form of Glucose-Fructose Oxidoreductase from Zymomonas mobilis

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Crystal Structures of the Precursor Form of Glucose-Fructose Oxidoreductase from Zymomonas Mobilis and its Complexes with Bound Ligands(,)

Nurizzo, D.Halbig, D.Sprenger, G.Baker, E.N.

(2001) Biochemistry 40: 13857

  • DOI: https://doi.org/10.1021/bi011355d
  • Primary Citation of Related Structures:  
    1H6A, 1H6B, 1H6C, 1H6D

  • PubMed Abstract: 

    The NADP(H)-dependent enzyme glucose-fructose oxidoreductase (GFOR) is a classic example of a redox protein that is translocated across a membrane in fully folded form. GFOR is synthesized in the cytoplasm with a 52-residue signal peptide, giving a precursor form, preGFOR, that is fully active and has its cofactor tightly bound. A twin-arginine motif in the signal peptide directs it to a Sec-independent pathway by which it is translocated, in fully folded form, into the periplasm where it functions to produce sorbitol for osmoprotection. We have determined the crystal structures of four different forms of preGFOR, (i) oxidized preGFOR, with succinate bound in the active site, (ii) oxidized preGFOR with glycerol bound, (iii) reduced preGFOR in 0.3 M glucose, and (iv) reduced preGFOR in 1.5 M sorbitol, at resolutions of 2.2, 2.05, 2.5, and 2.6 A, respectively. In all four crystal structures, the signal peptide is disordered, implying a flexibility that may be important for its interaction with the translocation apparatus; a factor contributing to this disorder may be the high positive charge of the protein surface in the region where the signal peptide emerges. This may disfavor a stable association between the signal peptide and the rest of the protein. The crystal structures show that the mature enzyme portion of preGFOR is identical to native GFOR, in structure and cofactor binding, explaining the enzymatic activity of the precursor form. In the glycerol complex, preGFOR(gll), a bound glycerol molecule models the binding of the glucose substrate, with its O1 atom hydrogen bonded to the essential acid/base catalyst, Tyr269, and C1 only 3 A from C4 of the nicotinamide. In the glucose-soaked structure, preGFOR(glu), we identify a conformational change of the nearby Lys181 that probably results from the oxidation of glucose to gluconolactone, and functions to prevent rebinding of glucose prior to the binding of fructose. In this conformational change, the Lys181 side chain moves closer to the nicotinamide ring, stabilized by its increased negative charge.

  • Organizational Affiliation

    School of Biological Sciences, University of Auckland, Auckland, New Zealand.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
433Zymomonas mobilisMutation(s): 0 
Find proteins for Q07982 (Zymomonas mobilis subsp. mobilis (strain ATCC 31821 / ZM4 / CP4))
Explore Q07982 
Go to UniProtKB:  Q07982
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ07982
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NDP

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C21 H30 N7 O17 P3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.896α = 90
b = 93.06β = 90
c = 115.486γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-11-28
    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: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description